kernel panic with 5.4.51-v7+ after short time, in particular during downloads

[jan-h-1970]

I have got lots of kernel panic with 5.4.51-v7+ after short time, in particular during downloads

affected models are 2Bv1.2, 3Bv1.2, 3B+ and probably more
using genuine rpi3 2.5A power supply
kernel 4.19.118-v7+ never had such issues

rpi is used as a (internet dsl) router.
I tried these as the second nic, both with errors
0b95:7e2b ASIX Electronics Corp. AX88772B Fast Ethernet Controller (module asix)
0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter (module r8152)

kernel 1.20200723-1
uname -a
Linux rpi 5.4.51-v7+ #1327 SMP Thu Jul 23 10:58:46 BST 2020 armv7l GNU/Linux

vcgencmd version
Jul 17 2020 11:04:27
Copyright (c) 2012 Broadcom
version 21a15cb094f41c7506ad65d2cb9b29c550693057 (clean) (release) (start)

cat /etc/rpi-issue
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 150e25c4f8123a4c9c63e8dca1b4737fa6c1135c, stage2

---

errors are:
Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: return_address+0x88/0x88
Unable to handle kernel paging request at virtual address 48200240
Kernel panic - not syncing: Attempted to kill the idle task!
Unable to handle kernel NULL pointer dereference at virtual address 0000012c
WARNING: CPU: 1 PID: 4431 at drivers/firmware/raspberrypi.c:63 rpi_firmware_transaction+0x108/0x128
Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: __netif_receive_skb_core+0xc2c/0xc34
Unhandled prefetch abort: unknown 1 (0x001) at 0x00000002
Bad mode in prefetch abort handler detected
Internal error: Oops - bad mode: 0 [#1] SMP ARM
Unable to handle kernel paging request at virtual address fffffffc
Internal error: Oops: 837 [#1] SMP ARM

---

model 2Bv1.2 examples

rpi login:
rpi login: [ 348.318763] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: return_address+0x88/0x88
[ 348.336178] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G C 5.4.51-v7+ #1327
[ 348.351425] Hardware name: BCM2835
[ 348.362018] Backtrace:
[ 348.371543] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 348.386439] r6:80d00000 r5:00000000 r4:80d93ff4 r3:e7eed6d5
[ 348.399416] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 348.414216] [<808b2244>] (dump_stack) from [<8011ff28>] (panic+0x12c/0x34c)
[ 348.428582] r8:b909d000 r7:80daaa20 r6:80a99374 r5:00000000 r4:80daaa66 r3:00000001
[ 348.443737] [<8011fdfc>] (panic) from [<8011fa98>] (print_tainted+0x0/0xa8)
[ 348.458170] r3:e7eed6d5 r2:80d04f48 r1:8010bc44 r0:80a99374
[ 348.471336] r7:b97b72c4
[ 348.481347] [<8011fa74>] (__stack_chk_fail) from [<8010bc44>] (c_start+0x0/0x2c)
[ 348.496478] [<8010cfa8>] (walk_stackframe) from [<8010bc18>] (return_address+0x5c/0x88)
[ 348.512258] r6:80d00000 r5:00000000 r4:80d04f48 r3:8010bbbc
[ 348.525656] [<8010bbbc>] (return_address) from [<8020b3fc>] (trace_hardirqs_off+0x84/0x170)
[ 348.541932] r5:00000001 r4:80125d00
[ 348.553437] [<8020b378>] (trace_hardirqs_off) from [<80125d00>] (tasklet_action_common+0x24/0xec)
[ 348.570576] r7:b97b72c4 r6:80d00000 r5:00000000 r4:80d03080
[ 348.584581] [<80125cdc>] (tasklet_action_common) from [<80125df0>] (tasklet_hi_action+0x28/0x30)
[ 348.601974] r9:00000001 r8:b909d000 r7:00000100 r6:80d00000 r5:00000000 r4:80d03080
[ 348.618468] [<80125dc8>] (tasklet_hi_action) from [<8010249c>] (__do_softirq+0x1a4/0x418)
[ 348.635446] [<801022f8>] (__do_softirq) from [<80125be4>] (irq_exit+0x100/0x110)
[ 348.651639] r10:b9fff840 r9:80d00000 r8:b909d000 r7:00000001 r6:00000000 r5:00000000
[ 348.668344] r4:80ca22a4
[ 348.679602] [<80125ae4>] (irq_exit) from [<80180ad4>] (__handle_domain_irq+0x70/0xc4)
[ 348.696341] [<80180a64>] (__handle_domain_irq) from [<80102228>] (bcm2836_arm_irqchip_handle_irq+0x60/0xa4)
[ 348.715153] r8:80d9943c r7:80d01f0c r6:ffffffff r5:60000013 r4:00000000 r3:80d01ed8
[ 348.732038] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 348.750062] Exception stack(0x80d01ed8 to 0x80d01f20)
[ 348.764157] 1ec0: 80109b94 00000000
[ 348.781506] 1ee0: 60000093 8011a2e0 80d04f68 80d00000 80d04fb0 00000001 80d9943c 80c68a40
[ 348.798922] 1f00: b9fff840 80d01f34 80d0535c 80d01f28 00000000 80109b98 60000013 ffffffff
[ 348.816361] r4:80109b98 r3:e7eed6d5
[ 348.829057] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 348.846398] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 348.863230] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 348.879902] r8:00000000 r7:80c68a40 r6:80daa580 r5:80daa5d8 r4:000000ce r3:80d01f50
[ 348.896817] [<801537cc>] (cpu_startup_entry) from [<808cc5a8>] (rest_init+0xbc/0xc0)
[ 348.913771] [<808cc4ec>] (rest_init) from [<80c00bd8>] (arch_call_rest_init+0x18/0x1c)
[ 348.930917] r4:80d04f48 r3:80c97260
[ 348.943722] [<80c00bc0>] (arch_call_rest_init) from [<80c01090>] (start_kernel+0x4b4/0x4e8)
[ 348.961585] [<80c00bdc>] (start_kernel) from [<00000000>] (0x0)
[ 348.976860] CPU1: stopping
[ 348.988844] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G C 5.4.51-v7+ #1327
[ 349.006179] Hardware name: BCM2835
[ 349.018937] Backtrace:
[ 349.030602] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 349.047550] r6:b9138000 r5:00000000 r4:80d93ff4 r3:e7eed6d5
[ 349.062547] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 349.079324] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 349.096095] r8:80da4b40 r7:00000000 r6:00000001 r5:80ca22a4 r4:80daa8e8 r3:e7eed6d5
[ 349.113227] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 349.131674] r10:00000000 r9:b9138000 r8:80d9943c r7:b9139f6c r6:ffffffff r5:60000013
[ 349.149051] r4:00000001
[ 349.160962] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 349.179457] Exception stack(0xb9139f38 to 0xb9139f80)
[ 349.194035] 9f20: 80109b94 00000000
[ 349.211795] 9f40: 60000093 8011a2e0 80d04f68 b9138000 80d04fb0 00000002 80d9943c 410fd034
[ 349.229536] 9f60: 00000000 b9139f94 80d0535c b9139f88 00000000 80109b98 60000013 ffffffff
[ 349.247182] r4:80109b98 r3:e7eed6d5
[ 349.260057] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 349.277585] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 349.294619] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 349.311513] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000001 r4:0000008a r3:e7eed6d5
[ 349.328599] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 349.347074] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 349.363677] r5:00000055 r4:3912806a
[ 349.376486] CPU3: stopping
[ 349.388111] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G C 5.4.51-v7+ #1327
[ 349.404992] Hardware name: BCM2835
[ 349.417143] Backtrace:
[ 349.428161] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 349.444488] r6:b913c000 r5:00000000 r4:80d93ff4 r3:e7eed6d5
[ 349.458860] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 349.474944] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 349.491034] r8:80da4b40 r7:00000000 r6:00000003 r5:80ca22a4 r4:80daa8e8 r3:e7eed6d5
[ 349.507462] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 349.525198] r10:00000000 r9:b913c000 r8:80d9943c r7:b913df6c r6:ffffffff r5:60000013
[ 349.541829] r4:00000003
[ 349.552980] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 349.570700] Exception stack(0xb913df38 to 0xb913df80)
[ 349.584523] df20: 80109b94 00000000
[ 349.601538] df40: 60000093 8011a2e0 80d04f68 b913c000 80d04fb0 00000008 80d9943c 410fd034
[ 349.618527] df60: 00000000 b913df94 80d0535c b913df88 00000000 80109b98 60000013 ffffffff
[ 349.635486] r4:80109b98 r3:e7eed6d5
[ 349.647754] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 349.664731] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 349.681289] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 349.697853] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000003 r4:0000008a r3:e7eed6d5
[ 349.714597] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 349.732731] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 349.749015] r5:00000055 r4:3912806a
[ 349.761589] CPU2: stopping
[ 349.773164] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G C 5.4.51-v7+ #1327
[ 349.790026] Hardware name: BCM2835
[ 349.802150] Backtrace:
[ 349.813191] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 349.829468] r6:b913a000 r5:00000000 r4:80d93ff4 r3:e7eed6d5
[ 349.843745] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 349.859750] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 349.875763] r8:80da4b40 r7:00000000 r6:00000002 r5:80ca22a4 r4:80daa8e8 r3:e7eed6d5
[ 349.892184] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 349.909887] r10:00000000 r9:b913a000 r8:80d9943c r7:b913bf6c r6:ffffffff r5:60000013
[ 349.926427] r4:00000002
[ 349.937502] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 349.955186] Exception stack(0xb913bf38 to 0xb913bf80)
[ 349.968956] bf20: 80109b94 00000000
[ 349.985879] bf40: 60000093 8011a2e0 80d04f68 b913a000 80d04fb0 00000004 80d9943c 410fd034
[ 350.002783] bf60: 00000000 b913bf94 80d0535c b913bf88 00000000 80109b98 60000013 ffffffff
[ 350.019665] r4:80109b98 r3:e7eed6d5
[ 350.031940] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 350.048925] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 350.065494] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 350.082064] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000002 r4:0000008a r3:e7eed6d5
[ 350.098816] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 350.116948] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 350.133225] r5:00000055 r4:3912806a
[ 350.145815] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: return_address+0x88/0x88 ]---

rpi login:
rpi login: [ 185.138583] 8<--- cut here ---
[ 185.149136] Unable to handle kernel paging request at virtual address 48200240
[ 185.164004] pgd = d8f27f20
[ 185.173927] [48200240] *pgd=00000000
[ 185.184709] Internal error: Oops: 2805 [#1] SMP ARM
[ 185.196820] Modules linked in: 8021q garp sha256_generic libsha256 cfg80211 rfkill bridge stp llc ipv6 pppoe pppox ppp_generic slhc sg cdc_ether r8152 nft_chain_nat uas xt_MASQUERADE xt_nat nf_nat nfnetlink_log nft_limit raspberrypi_hwmon bcm2835_codec(C) bcm2835_isp(C) bcm2835_v4l2(C) v4l2_mem2mem bcm2835_mmal_vchiq(C) videobuf2_dma_contig snd_bcm2835(C) videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 snd_pcm videobuf2_common snd_timer videodev snd vc_sm_cma(C) mc nft_counter uio_pdrv_genirq uio fixed xt_NFLOG xt_limit xt_state xt_comment xt_conntrack nf_conntrack nf_defrag_ipv4 nf_defrag_ipv6 xt_tcpudp nft_compat nf_tables nfnetlink ip_tables x_tables
[ 185.296667] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G C 5.4.51-v7+ #1327
[ 185.310646] Hardware name: BCM2835
[ 185.320011] PC is at __dma_clear_buffer+0x0/0x6c
[ 185.330551] LR is at walk_stackframe+0x2c/0x40
[ 185.340915] pc : [<80116ebc>] lr : [<8010cfd4>] psr: 90000093
[ 185.353194] sp : b9139ef8 ip : 0010bbbc fp : b9139f04
[ 185.364485] r10: 00000000 r9 : 410fd034 r8 : 80d9943c
[ 185.375787] r7 : 00000002 r6 : 8010bb8c r5 : b9139f2c r4 : b9139f34
[ 185.388444] r3 : 85cd5d6e r2 : 00000040 r1 : 72273e60 r0 : 48200240
[ 185.401117] Flags: NzcV IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
[ 185.414521] Control: 10c5383d Table: 2f49806a DAC: 00000055
[ 185.426423] Process swapper/1 (pid: 0, stack limit = 0xdc684219)
[ 185.438634] Stack: (0xb9139ef8 to 0xb913a000)
[ 185.449096] 9ee0: b9139f24 b9139f08
[ 185.463420] 9f00: 8010cfdc 8010cf4c 8010bbbc 80d04f48 00000000 80d04fb0 b9139f5c b9139f28
[ 185.477763] 9f20: 8010bc18 8010cfb4 b9139fa4 00000000 00000000 b9139fa4 b9139f98 8020b290
[ 185.492057] 9f40: 80109b94 0010bbbc 00000000 00002c84 b9139f34 b9139f60 8020b290 8010bbc8
[ 185.506310] 9f60: 8011a2e0 80d04f68 b9138000 80d04fb0 00000002 80d9943c b9139f94 b9139f88
[ 185.520588] 9f80: 80109b94 8020b210 b9139fa4 b9139f98 808d2c84 80109b70 b9139fcc b9139fa8
[ 185.534874] 9fa0: 80153494 808d2c5c e7eed6d5 0000008a 00000001 10c0387d 80daa8f8 0000406a
[ 185.549193] 9fc0: b9139fdc b9139fd0 801537f4 801533b4 b9139ff4 b9139fe0 8010fd94 801537d8
[ 185.563548] 9fe0: 3912806a 00000055 00000000 b9139ff8 001027ac 8010fc70 00000000 00000000
[ 185.577873] Backtrace:
[ 185.586347] [<8010cf40>] (unwind_frame) from [<8010cfdc>] (walk_stackframe+0x34/0x40)
[ 185.600305] [<8010cfa8>] (walk_stackframe) from [<8010bc18>] (return_address+0x5c/0x88)
[ 185.614394] r6:80d04fb0 r5:00000000 r4:80d04f48 r3:8010bbbc
[ 185.626141] [<8010bbbc>] (return_address) from [<8020b290>] (trace_hardirqs_on+0x8c/0x174)
[ 185.640556] r5:00002c84 r4:00000000
[ 185.650160] Backtrace aborted due to bad frame pointer
[ 185.662334] Code: e060000c e0840280 ebffffa1 e89da818 (e1a0c00d)
[ 185.674453] ---[ end trace a83b129da31469a7 ]---
[ 185.685103] Kernel panic - not syncing: Attempted to kill the idle task!
[ 185.697963] CPU0: stopping
[ 185.706690] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D C 5.4.51-v7+ #1327
[ 185.720680] Hardware name: BCM2835
[ 185.730060] Backtrace:
[ 185.738471] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 185.752164] r6:80d00000 r5:00000000 r4:80d93ff4 r3:e7eed6d5
[ 185.763778] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 185.776925] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 185.789928] r8:80da4b40 r7:80d01ed8 r6:00000000 r5:80ca22a4 r4:80daa8e8 r3:e7eed6d5
[ 185.803133] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 185.817486] r10:00000000 r9:80d00000 r8:b909d000 r7:80d01dfc r6:ffffffff r5:60000113
[ 185.830708] r4:00000000
[ 185.838534] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 185.852904] Exception stack(0x80d01dc8 to 0x80d01e10)
[ 185.863466] 1dc0: 801023f8 00000000 60000193 80ca22c0 80d03084 00000000
[ 185.877278] 1de0: 80d00000 00000100 b909d000 00000040 00000000 80d01e84 80d0535c 80d01e18
[ 185.891076] 1e00: 00000000 801023fc 60000113 ffffffff
[ 185.901731] r4:801023fc r3:e7eed6d5
[ 185.910907] [<801022f8>] (__do_softirq) from [<80125be4>] (irq_exit+0x100/0x110)
[ 185.924028] r10:b9fff840 r9:80d00000 r8:b909d000 r7:00000001 r6:00000000 r5:00000000
[ 185.937582] r4:80ca22a4
[ 185.945771] [<80125ae4>] (irq_exit) from [<80180ad4>] (__handle_domain_irq+0x70/0xc4)
[ 185.959398] [<80180a64>] (__handle_domain_irq) from [<80102228>] (bcm2836_arm_irqchip_handle_irq+0x60/0xa4)
[ 185.975024] r8:80d9943c r7:80d01f0c r6:ffffffff r5:60000013 r4:00000000 r3:80d01ed8
[ 185.988690] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 186.003569] Exception stack(0x80d01ed8 to 0x80d01f20)
[ 186.014624] 1ec0: 80109b94 00000000
[ 186.028890] 1ee0: 60000093 8011a2e0 80d04f68 80d00000 80d04fb0 00000001 80d9943c 80c68a40
[ 186.043157] 1f00: b9fff840 80d01f34 80d0535c 80d01f28 00000000 80109b98 60000013 ffffffff
[ 186.057431] r4:80109b98 r3:e7eed6d5
[ 186.067034] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 186.081281] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 186.095081] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 186.108753] r8:00000000 r7:80c68a40 r6:80daa580 r5:80daa5d8 r4:000000ce r3:80d01f50
[ 186.122601] [<801537cc>] (cpu_startup_entry) from [<808cc5a8>] (rest_init+0xbc/0xc0)
[ 186.136487] [<808cc4ec>] (rest_init) from [<80c00bd8>] (arch_call_rest_init+0x18/0x1c)
[ 186.150515] r4:80d04f48 r3:80c97260
[ 186.160102] [<80c00bc0>] (arch_call_rest_init) from [<80c01090>] (start_kernel+0x4b4/0x4e8)
[ 186.174559] [<80c00bdc>] (start_kernel) from [<00000000>] (0x0)
[ 186.186555] CPU2: stopping
[ 186.195287] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D C 5.4.51-v7+ #1327
[ 186.209319] Hardware name: BCM2835
[ 186.218736] Backtrace:
[ 186.227142] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 186.240787] r6:b913a000 r5:00000000 r4:80d93ff4 r3:e7eed6d5
[ 186.252506] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 186.266014] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 186.279550] r8:80da4b40 r7:00000000 r6:00000002 r5:80ca22a4 r4:80daa8e8 r3:e7eed6d5
[ 186.293451] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 186.308609] r10:00000000 r9:b913a000 r8:80d9943c r7:b913bf6c r6:ffffffff r5:60000013
[ 186.322696] r4:00000002
[ 186.331372] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 186.346520] Exception stack(0xb913bf38 to 0xb913bf80)
[ 186.357765] bf20: 80109b94 00000000
[ 186.372192] bf40: 60000093 8011a2e0 80d04f68 b913a000 80d04fb0 00000004 80d9943c 410fd034
[ 186.386597] bf60: 00000000 b913bf94 80d0535c b913bf88 00000000 80109b98 60000013 ffffffff
[ 186.400951] r4:80109b98 r3:e7eed6d5
[ 186.410614] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 186.424906] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 186.438772] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 186.452593] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000002 r4:0000008a r3:e7eed6d5
[ 186.466598] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 186.481956] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 186.495461] r5:00000055 r4:3912806a
[ 186.505208] CPU3: stopping
[ 186.513993] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G D C 5.4.51-v7+ #1327
[ 186.528010] Hardware name: BCM2835
[ 186.537350] Backtrace:
[ 186.545628] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 186.559143] r6:b913c000 r5:00000000 r4:80d93ff4 r3:e7eed6d5
[ 186.570710] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 186.584000] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 186.597297] r8:80da4b40 r7:00000000 r6:00000003 r5:80ca22a4 r4:80daa8e8 r3:e7eed6d5
[ 186.610955] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 186.625867] r10:00000000 r9:b913c000 r8:80d9943c r7:b913df6c r6:ffffffff r5:60000013
[ 186.639654] r4:00000003
[ 186.648044] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 186.662938] Exception stack(0xb913df38 to 0xb913df80)
[ 186.673944] df20: 80109b94 00000000
[ 186.688140] df40: 60000093 8011a2e0 80d04f68 b913c000 80d04fb0 00000008 80d9943c 410fd034
[ 186.702315] df60: 00000000 b913df94 80d0535c b913df88 00000000 80109b98 60000013 ffffffff
[ 186.716456] r4:80109b98 r3:e7eed6d5
[ 186.725957] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 186.740091] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 186.753801] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 186.767492] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000003 r4:0000008a r3:e7eed6d5
[ 186.781361] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 186.796587] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 186.809947] r5:00000055 r4:3912806a
[ 186.819639] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

---

model 3Bv1.2 examples

rpi login:
rpi login: [ 1024.278042] 8<--- cut here ---
[ 1024.285807] Unable to handle kernel NULL pointer dereference at virtual address 0000012c
[ 1024.298697] pgd = 460a0d09
[ 1024.306045] [0000012c] *pgd=00000000
[ 1024.314198] Internal error: Oops: 5 [#1] SMP ARM
[ 1024.323388] Modules linked in: 8021q garp sha256_generic libsha256 cfg80211 rfkill bridge stp llc ipv6 pppoe pppox ppp_generic slhc sg nft_chain_nat uas asix xt_MASQUERADE xt_nat nf_nat nfnetlink_log raspberrypi_hwmon nft_limit snd_bcm2835(C) bcm2835_codec(C) snd_pcm bcm2835_isp(C) v4l2_mem2mem bcm2835_v4l2(C) videobuf2_dma_contig bcm2835_mmal_vchiq(C) videobuf2_vmalloc snd_timer videobuf2_memops videobuf2_v4l2 videobuf2_common snd videodev vc_sm_cma(C) mc uio_pdrv_genirq uio fixed nft_counter xt_NFLOG xt_limit xt_state xt_comment xt_conntrack nf_conntrack nf_defrag_ipv4 nf_defrag_ipv6 xt_tcpudp nft_compat nf_tables nfnetlink ip_tables x_tables
[ 1024.407141] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G C 5.4.51-v7+ #1327
[ 1024.420725] Hardware name: BCM2835
[ 1024.429703] PC is at enqueue_task_fair+0x10e4/0x17e0
[ 1024.440294] LR is at __enqueue_entity+0x84/0x88
[ 1024.450458] pc : [<8015b264>] lr : [<80154000>] psr: 20000093
[ 1024.462401] sp : 80d01ce8 ip : 80d01cc0 fp : 80d01d74
[ 1024.473342] r10: 00000000 r9 : 00000000 r8 : 005da8f1
[ 1024.484322] r7 : 00000000 r6 : 005d9c00 r5 : 00000001 r4 : b97c1740
[ 1024.496634] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : b2a69f0c
[ 1024.508946] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
[ 1024.522023] Control: 10c5383d Table: 2f40c06a DAC: 00000055
[ 1024.533611] Process swapper/0 (pid: 0, stack limit = 0xcb928f1b)
[ 1024.545426] Stack: (0x80d01ce8 to 0x80d02000)
[ 1024.555641] 1ce0: 00000001 b700e780 80d04f48 80c973c0 b97c1700 80d01d08
[ 1024.569813] 1d00: 00000001 8010bb98 8010bbbc 80d04f48 00000000 b88c761c 80d99446 80d01d28
[ 1024.583974] 1d20: 00000000 8010cfb4 00000000 00000000 00000000 00000009 b2a6a040 80d01d48
[ 1024.598085] 1d40: 801b0374 387f5dfd ffffffff b2a69e80 00000009 b97c1700 b2a6a180 00000000
[ 1024.612135] 1d60: b97c1700 80000093 80d01d94 80d01d78 8014d328 8015a18c b2a69e80 b97c1700
[ 1024.626158] 1d80: 00000000 80d01dcc 80d01db4 80d01d98 8014d8e8 8014d2b0 b2a69e80 80d04f48
[ 1024.640122] 1da0: 00000000 b2a6a3d4 80d01e04 80d01db8 8014e478 8014d8a8 80d01dfc 80d01dc8
[ 1024.654065] 1dc0: 80ca2700 38b1f000 b88c7670 00000000 00000000 387f5dfd 80d01e90 b8a5d8ac
[ 1024.668085] 1de0: b97c1318 b97c4500 b97c4505 b97c1300 80d05684 b900c300 80d01e14 80d01e08
[ 1024.682124] 1e00: 8014eabc 8014e230 80d01e24 80d01e18 80138d04 8014eaa8 80d01e4c 80d01e28
[ 1024.696181] 1e20: 80139a40 80138cd8 00000000 b97c4500 b8a5d8ac 00000004 00000000 80dab18c
[ 1024.710217] 1e40: 80d01e94 80d01e50 8013b2fc 801399d8 0000a736 80ca2700 00000000 80c972d4
[ 1024.724215] 1e60: 80c972d4 00000000 80d01ebc 60000093 00000001 b900c300 00000004 b97c0d30
[ 1024.738138] 1e80: 80c68a40 b9fff840 80d01eb4 80d01e98 8013b720 8013b1b0 b8a5d844 00000000
[ 1024.752002] 1ea0: 00000000 b8a5ab0c 80d01ec4 80d01eb8 8071a43c 8013b68c 80d01ed4 80d01ec8
[ 1024.765841] 1ec0: 8071a474 8071a400 80d01eec 80d01ed8 8071a7e0 8071a44c b8a5d844 b8a5ab10
[ 1024.779664] 1ee0: 80d01f0c 80d01ef0 8071b594 8071a77c b8a5ab00 00000000 00000004 00000000
[ 1024.793502] 1f00: 80d01f34 80d01f10 8071d0cc 8071b554 0000000f 80d04f68 80d00000 80d04fb0
[ 1024.807378] 1f20: 00000001 80d9943c 80d01f44 80d01f38 80109be8 8071d000 80d01f6c 80d01f48
[ 1024.821308] 1f40: 80153464 80109bd8 80d01f50 000000ce 80daa5d8 80daa580 80c68a40 00000000
[ 1024.835276] 1f60: 80d01f7c 80d01f70 801537f4 801533b4 80d01f94 80d01f80 808cc5a8 801537d8
[ 1024.849194] 1f80: 80c97260 80d04f48 80d01fa4 80d01f98 80c00bd8 808cc4f8 80d01ff4 80d01fa8
[ 1024.863075] 1fa0: 80c01090 80c00bcc ffffffff ffffffff 00000000 80c007b0 00000000 80c68a40
[ 1024.877031] 1fc0: 387a59ce 00000000 00000000 80c00330 00000055 10c0387d 00000c42 2eff8e00
[ 1024.891010] 1fe0: 410fd034 10c5387d 00000000 80d01ff8 00000000 80c00be8 00000000 00000000
[ 1024.904809] Backtrace:
[ 1024.912640] [<8015a180>] (enqueue_task_fair) from [<8014d328>] (activate_task+0x84/0xf4)
[ 1024.926089] r10:80000093 r9:b97c1700 r8:00000000 r7:b2a6a180 r6:b97c1700 r5:00000009
[ 1024.939122] r4:b2a69e80
[ 1024.946603] [<8014d2a4>] (activate_task) from [<8014d8e8>] (ttwu_do_activate+0x4c/0x64)
[ 1024.959686] r7:80d01dcc r6:00000000 r5:b97c1700 r4:b2a69e80
[ 1024.970400] [<8014d89c>] (ttwu_do_activate) from [<8014e478>] (try_to_wake_up+0x254/0x878)
[ 1024.983833] r7:b2a6a3d4 r6:00000000 r5:80d04f48 r4:b2a69e80
[ 1024.994697] [<8014e224>] (try_to_wake_up) from [<8014eabc>] (wake_up_process+0x20/0x24)
[ 1025.007998] r10:b900c300 r9:80d05684 r8:b97c1300 r7:b97c4505 r6:b97c4500 r5:b97c1318
[ 1025.021161] r4:b8a5d8ac
[ 1025.028992] [<8014ea9c>] (wake_up_process) from [<80138d04>] (wake_up_worker+0x38/0x3c)
[ 1025.042501] [<80138ccc>] (wake_up_worker) from [<80139a40>] (insert_work+0x74/0xac)
[ 1025.055722] [<801399cc>] (insert_work) from [<8013b2fc>] (__queue_work+0x158/0x4dc)
[ 1025.068925] r8:80dab18c r7:00000000 r6:00000004 r5:b8a5d8ac r4:b97c4500 r3:00000000
[ 1025.082217] [<8013b1a4>] (__queue_work) from [<8013b720>] (queue_work_on+0xa0/0xa4)
[ 1025.095443] r10:b9fff840 r9:80c68a40 r8:b97c0d30 r7:00000004 r6:b900c300 r5:00000001
[ 1025.108897] r4:60000093
[ 1025.116962] [<8013b680>] (queue_work_on) from [<8071a43c>] (led_set_brightness_nopm+0x48/0x4c)
[ 1025.131243] r7:b8a5ab0c r6:00000000 r5:00000000 r4:b8a5d844
[ 1025.142587] [<8071a3f4>] (led_set_brightness_nopm) from [<8071a474>] (led_set_brightness_nosleep+0x34/0x38)
[ 1025.158192] [<8071a440>] (led_set_brightness_nosleep) from [<8071a7e0>] (led_set_brightness+0x70/0x74)
[ 1025.173349] [<8071a770>] (led_set_brightness) from [<8071b594>] (led_trigger_event+0x4c/0x8c)
[ 1025.187740] r5:b8a5ab10 r4:b8a5d844
[ 1025.197174] [<8071b548>] (led_trigger_event) from [<8071d0cc>] (ledtrig_cpu+0xd8/0xf4)
[ 1025.211061] r7:00000000 r6:00000004 r5:00000000 r4:b8a5ab00
[ 1025.222674] [<8071cff4>] (ledtrig_cpu) from [<80109be8>] (arch_cpu_idle_enter+0x1c/0x20)
[ 1025.236806] r8:80d9943c r7:00000001 r6:80d04fb0 r5:80d00000 r4:80d04f68 r3:0000000f
[ 1025.250595] [<80109bcc>] (arch_cpu_idle_enter) from [<80153464>] (do_idle+0xbc/0x170)
[ 1025.264493] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 1025.278165] r8:00000000 r7:80c68a40 r6:80daa580 r5:80daa5d8 r4:000000ce r3:80d01f50
[ 1025.282868] ------------[ cut here ]------------
[ 1025.292056] [<801537cc>] (cpu_startup_entry) from [<808cc5a8>] (rest_init+0xbc/0xc0)
[ 1025.292075] [<808cc4ec>] (rest_init) from [<80c00bd8>] (arch_call_rest_init+0x18/0x1c)
[ 1025.302914] WARNING: CPU: 1 PID: 4431 at drivers/firmware/raspberrypi.c:63 rpi_firmware_transaction+0x108/0x128
[ 1025.316833] r4:80d04f48 r3:80c97260
[ 1025.316845] [<80c00bc0>] (arch_call_rest_init) from [<80c01090>] (start_kernel+0x4b4/0x4e8)
[ 1025.316856] [<80c00bdc>] (start_kernel) from [<00000000>] (0x0)
[ 1025.316866] Code: e5cec002 ebff12b7 eafffd72 e3a03001 (e50b3074)
[ 1025.316874] ---[ end trace 7756409a12fcdea6 ]---
[ 1025.331225] Firmware transaction timeout
[ 1025.331231] Modules linked in:
[ 1025.347666] Kernel panic - not syncing: Attempted to kill the idle task!
[ 1025.347684] CPU1: stopping
[ 1025.347698] CPU: 1 PID: 4431 Comm: kworker/1:0 Tainted: G D C 5.4.51-v7+ #1327
[ 1025.347702] Hardware name: BCM2835
[ 1025.347721] Workqueue: events dbs_work_handler
[ 1025.347727] Backtrace:
[ 1025.347745] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 1025.347755] r6:af51a000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 1025.347771] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 1025.347785] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 1025.347796] r8:80da4b40 r7:af51ba98 r6:00000001 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 1025.347809] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 1025.347820] r10:00000012 r9:af51a000 r8:b909d000 r7:af51b9bc r6:ffffffff r5:60000113
[ 1025.347824] r4:00000001
[ 1025.347835] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 1025.347840] Exception stack(0xaf51b988 to 0xaf51b9d0)
[ 1025.347851] b980: 801023f8 00000000 60000193 80ca22c0 04208060 00000000
[ 1025.347862] b9a0: 00000000 00000001 b909d000 00000002 00000012 af51ba44 80d0535c af51b9d8
[ 1025.347869] b9c0: 00000000 801023fc 60000113 ffffffff
[ 1025.347874] r4:801023fc r3:387f5dfd
[ 1025.347893] [<801022f8>] (__do_softirq) from [<80125be4>] (irq_exit+0x100/0x110)
[ 1025.347903] r10:00000012 r9:af51a000 r8:b909d000 r7:00000001 r6:00000000 r5:00000000
[ 1025.347907] r4:80ca22a4
[ 1025.347921] [<80125ae4>] (irq_exit) from [<80180ad4>] (__handle_domain_irq+0x70/0xc4)
[ 1025.347933] [<80180a64>] (__handle_domain_irq) from [<80102228>] (bcm2836_arm_irqchip_handle_irq+0x60/0xa4)
[ 1025.347944] r8:00000001 r7:af51bacc r6:ffffffff r5:60000013 r4:00000001 r3:af51ba98
[ 1025.347954] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 1025.347959] Exception stack(0xaf51ba98 to 0xaf51bae0)
[ 1025.347965] ba80: 8017f0c8 00000000
[ 1025.347975] baa0: 60000093 00000000 80dafa50 60000013 80d04fcc 00000001 00000001 00000000
[ 1025.347985] bac0: 00000012 af51bb2c 80d0535c af51bae8 00000000 8017f0dc 60000013 ffffffff
[ 1025.347991] r4:8017f0dc r3:387f5dfd
[ 1025.348001] [<8017edc8>] (vprintk_emit) from [<8017f1b8>] (vprintk_default+0x50/0x7c)
[ 1025.348014] r10:b2ae0600 r9:8071d620 r8:0000003f r7:00000009 r6:80aa2984 r5:af51bb94
[ 1025.348018] r4:80c9b408
[ 1025.348028] [<8017f168>] (vprintk_default) from [<80180218>] (vprintk_func+0x6c/0x11c)
[ 1025.348038] [<801801ac>] (vprintk_func) from [<8017fa70>] (printk+0x40/0x5c)
[ 1025.348046] r7:00000009 r6:80d04f48 r5:00000000 r4:80d04f48
[ 1025.348058] [<8017fa30>] (printk) from [<801be574>] (print_modules+0x34/0xdc)
[ 1025.348067] r3:387f5dfd r2:80d04f64 r1:00000000 r0:80aa2984
[ 1025.348071] r4:af51bc1c
[ 1025.348083] [<801be540>] (print_modules) from [<8011fcc8>] (__warn+0x90/0x104)
[ 1025.348090] r6:80aff6e8 r5:00000000 r4:af51bc1c
[ 1025.348101] [<8011fc38>] (__warn) from [<8011fdc0>] (warn_slowpath_fmt+0x84/0xc0)
[ 1025.348111] r9:80aff6e8 r8:0000003f r7:8071d620 r6:00000009 r5:80aff708 r4:80d04f48
[ 1025.348126] [<8011fd40>] (warn_slowpath_fmt) from [<8071d620>] (rpi_firmware_transaction+0x108/0x128)
[ 1025.348138] r9:b91ab140 r8:00000018 r7:00000000 r6:ffffff92 r5:b91ab140 r4:80d04f48
[ 1025.348152] [<8071d518>] (rpi_firmware_transaction) from [<8071d70c>] (rpi_firmware_property_list+0xcc/0x180)
[ 1025.348161] r7:80d04f48 r6:ba001000 r5:00001000 r4:40000008
[ 1025.348175] [<8071d640>] (rpi_firmware_property_list) from [<8071d838>] (rpi_firmware_property+0x78/0xf8)
[ 1025.348185] r10:00000000 r9:b91ab140 r8:00038002 r7:af51bd00 r6:00000018 r5:0000000c
[ 1025.348190] r4:b2ae0600
[ 1025.348205] [<8071d7c0>] (rpi_firmware_property) from [<805b31e0>] (raspberrypi_clock_property+0x54/0x7c)
[ 1025.348216] r10:00000000 r9:1bd0c210 r8:00000000 r7:b92f4ec0 r6:00000003 r5:af51bd30
[ 1025.348220] r4:80d04f48
[ 1025.348230] [<805b318c>] (raspberrypi_clock_property) from [<805b333c>] (raspberrypi_fw_set_rate+0x4c/0xb8)
[ 1025.348237] r6:29b92700 r5:b92f4f40 r4:80d04f48
[ 1025.348250] [<805b32f0>] (raspberrypi_fw_set_rate) from [<805ab6e8>] (clk_change_rate+0x10c/0x480)
[ 1025.348258] r7:00000000 r6:29b92700 r5:80d04f48 r4:b93f0780
[ 1025.348271] [<805ab5dc>] (clk_change_rate) from [<805abbf0>] (clk_core_set_rate_nolock+0x194/0x1a8)
[ 1025.348283] r10:b97b6010 r9:00000000 r8:b93f0780 r7:29b92700 r6:00000000 r5:80d04f48
[ 1025.348287] r4:b93f0780
[ 1025.348299] [<805aba5c>] (clk_core_set_rate_nolock) from [<805abc40>] (clk_set_rate+0x3c/0x78)
[ 1025.348308] r8:1bd0c210 r7:b8a5a340 r6:80d04f48 r5:29b92700 r4:b8a5a340
[ 1025.348321] [<805abc04>] (clk_set_rate) from [<806eb70c>] (dev_pm_opp_set_rate+0x4a4/0x534)
[ 1025.348327] r5:29b92700 r4:b8a5d200
[ 1025.348338] [<806eb268>] (dev_pm_opp_set_rate) from [<806f5d5c>] (set_target+0x40/0x60)
[ 1025.348349] r10:000aae60 r9:00000000 r8:00000001 r7:80e51d0c r6:00000000 r5:b8a5d600
[ 1025.348353] r4:000aae60
[ 1025.348367] [<806f5d1c>] (set_target) from [<806f0bd0>] (__cpufreq_driver_target+0x2f8/0x5bc)
[ 1025.348375] r6:00000000 r5:80d04f48 r4:b8a5d600 r3:387f5dfd
[ 1025.348389] [<806f08d8>] (__cpufreq_driver_target) from [<806f3b5c>] (od_dbs_update+0xa8/0x174)
[ 1025.348400] r10:00000000 r9:b62b0e00 r8:b62f8440 r7:b62f8440 r6:b62b0e00 r5:b8a5d600
[ 1025.348404] r4:b62b0d80
[ 1025.348414] [<806f3ab4>] (od_dbs_update) from [<806f5024>] (dbs_work_handler+0x3c/0x68)
[ 1025.348425] r9:00000040 r8:80d84ce0 r7:b8a5d600 r6:b62b0d84 r5:00000000 r4:b62b0db8
[ 1025.348438] [<806f4fe8>] (dbs_work_handler) from [<8013bd94>] (process_one_work+0x17c/0x4b4)
[ 1025.348450] r8:00000000 r7:b97d8500 r6:b97d5300 r5:b737f500 r4:b62b0db8 r3:806f4fe8
[ 1025.348462] [<8013bc18>] (process_one_work) from [<8013c5fc>] (worker_thread+0x54/0x5b4)
[ 1025.348473] r10:b737f500 r9:af51a038 r8:80d03d00 r7:b97d5318 r6:00000008 r5:b737f514
[ 1025.348477] r4:b97d5300
[ 1025.348490] [<8013c5a8>] (worker_thread) from [<801429e0>] (kthread+0x13c/0x168)
[ 1025.348500] r10:af54dd9c r9:b72fbe74 r8:8013c5a8 r7:b737f500 r6:00000000 r5:b2ae0c00
[ 1025.348504] r4:af54dd80
[ 1025.348516] [<801428a4>] (kthread) from [<801010ac>] (ret_from_fork+0x14/0x28)
[ 1025.348522] Exception stack(0xaf51bfb0 to 0xaf51bff8)
[ 1025.348529] bfa0: 00000000 00000000 00000000 00000000
[ 1025.348538] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 1025.348546] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 1025.348557] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:801428a4
[ 1025.348562] r4:b2ae0c00 r3:80104648
[ 1025.348568] CPU3: stopping
[ 1025.348578] CPU: 3 PID: 119 Comm: systemd-journal Tainted: G D C 5.4.51-v7+ #1327
[ 1025.348582] Hardware name: BCM2835
[ 1025.348584] Backtrace:
[ 1025.348599] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 1025.348608] r6:b7bf0000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 1025.348619] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 1025.348630] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 1025.348641] r8:80da4b40 r7:00000000 r6:00000003 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 1025.348653] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 1025.348664] r10:000385c8 r9:00a2d578 r8:10c5387d r7:10c5383d r6:ffffffff r5:60000010
[ 1025.348668] r4:00000003
[ 1025.348680] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101d8c>] (__irq_usr+0x4c/0x60)
[ 1025.348685] Exception stack(0xb7bf1fb0 to 0xb7bf1ff8)
[ 1025.348693] 1fa0: 00000000 00000000 93098c00 93098c00
[ 1025.348704] 1fc0: 000320f0 00000000 76fa3968 7ece0084 727710f0 00a2d578 000385c8 00000000
[ 1025.348712] 1fe0: 00000000 7ecdfff8 00000006 76cad77c 60000010 ffffffff
[ 1025.348718] r4:76cad77c r3:387f5dfd
[ 1025.348724] CPU2: stopping
[ 1025.348734] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D C 5.4.51-v7+ #1327
[ 1025.348738] Hardware name: BCM2835
[ 1025.348741] Backtrace:
[ 1025.348755] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 1025.348764] r6:b913a000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 1025.348775] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 1025.348787] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 1025.348798] r8:80da4b40 r7:00000000 r6:00000002 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 1025.348809] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 1025.348821] r10:00000000 r9:b913a000 r8:80d9943c r7:b913bf6c r6:ffffffff r5:60000013
[ 1025.348825] r4:00000002
[ 1025.348835] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 1025.348840] Exception stack(0xb913bf38 to 0xb913bf80)
[ 1025.348848] bf20: 80109b94 00000000
[ 1025.348858] bf40: 60000093 8011a2e0 80d04f68 b913a000 80d04fb0 00000004 80d9943c 410fd034
[ 1025.348869] bf60: 00000000 b913bf94 80d0535c b913bf88 00000000 80109b98 60000013 ffffffff
[ 1025.348875] r4:80109b98 r3:387f5dfd
[ 1025.348890] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 1025.348902] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 1025.348911] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 1025.348922] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000002 r4:0000008a r3:387f5dfd
[ 1025.348933] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 1025.348944] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 1025.348949] r5:00000055 r4:3912806a
[ 1027.122909] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

rpi login:
rpi login: [ 400.058445] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: __netif_receive_skb_core+0xc2c/0xc34
[ 400.074550] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G C 5.4.51-v7+ #1327
[ 400.087415] Hardware name: BCM2835
[ 400.095689] Backtrace:
[ 400.102927] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 400.115408] r6:80d00000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 400.125971] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 400.138316] [<808b2244>] (dump_stack) from [<8011ff28>] (panic+0x12c/0x34c)
[ 400.150310] r8:00000001 r7:80daaa20 r6:80a99374 r5:00000000 r4:80daaa72 r3:00000001
[ 400.163128] [<8011fdfc>] (panic) from [<8011fa98>] (print_tainted+0x0/0xa8)
[ 400.175178] r3:391bf1ed r2:387f5dfd r1:8077a9d8 r0:80a99374
[ 400.185972] r7:00006488
[ 400.193621] [<8011fa74>] (__stack_chk_fail) from [<8077a9d8>] (__netif_receive_skb_core+0xc2c/0xc34)
[ 400.208097] [<80779dac>] (__netif_receive_skb_core) from [<8077aa24>] (__netif_receive_skb_one_core+0x44/0x80)
[ 400.223508] r10:00000001 r9:00000001 r8:00000000 r7:00000040 r6:00000000 r5:b89a1800
[ 400.236754] r4:80d04f48
[ 400.244681] [<8077a9e0>] (__netif_receive_skb_one_core) from [<8077aaa0>] (__netif_receive_skb+0x20/0x7c)
[ 400.259920] r5:b97c2088 r4:b97c2130
[ 400.269172] [<8077aa80>] (__netif_receive_skb) from [<8077ad60>] (process_backlog+0x90/0x144)
[ 400.283584] r4:b97c2130 r3:b97c2088
[ 400.293005] [<8077acd0>] (process_backlog) from [<8077c764>] (net_rx_action+0x308/0x4a4)
[ 400.307110] r10:0000012c r9:00000008 r8:00000040 r7:00000000 r6:00000001 r5:b97c2130
[ 400.320982] r4:ffffffff r3:8077acd0
[ 400.330530] [<8077c45c>] (net_rx_action) from [<8010249c>] (__do_softirq+0x1a4/0x418)
[ 400.344495] r10:0000000c r9:00000008 r8:b909d000 r7:00000100 r6:80d00000 r5:00000003
[ 400.358538] r4:80d0308c
[ 400.367162] [<801022f8>] (__do_softirq) from [<80125be4>] (irq_exit+0x100/0x110)
[ 400.380700] r10:b9fff840 r9:80d00000 r8:b909d000 r7:00000001 r6:00000000 r5:00000000
[ 400.394648] r4:80ca22a4
[ 400.403217] [<80125ae4>] (irq_exit) from [<80180ad4>] (__handle_domain_irq+0x70/0xc4)
[ 400.417243] [<80180a64>] (__handle_domain_irq) from [<80102228>] (bcm2836_arm_irqchip_handle_irq+0x60/0xa4)
[ 400.433330] r8:80d9943c r7:80d01f0c r6:ffffffff r5:60000013 r4:00000000 r3:80d01ed8
[ 400.447468] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 400.462826] Exception stack(0x80d01ed8 to 0x80d01f20)
[ 400.474292] 1ec0: 80109b94 00000000
[ 400.488926] 1ee0: 60000093 8011a2e0 80d04f68 80d00000 80d04fb0 00000001 80d9943c 80c68a40
[ 400.503529] 1f00: b9fff840 80d01f34 80d0535c 80d01f28 00000000 80109b98 60000013 ffffffff
[ 400.518071] r4:80109b98 r3:387f5dfd
[ 400.527959] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 400.542502] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 400.556632] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 400.570727] r8:00000000 r7:80c68a40 r6:80daa580 r5:80daa5d8 r4:000000ce r3:80d01f50
[ 400.585070] [<801537cc>] (cpu_startup_entry) from [<808cc5a8>] (rest_init+0xbc/0xc0)
[ 400.599326] [<808cc4ec>] (rest_init) from [<80c00bd8>] (arch_call_rest_init+0x18/0x1c)
[ 400.613681] r4:80d04f48 r3:80c97260
[ 400.623626] [<80c00bc0>] (arch_call_rest_init) from [<80c01090>] (start_kernel+0x4b4/0x4e8)
[ 400.638577] [<80c00bdc>] (start_kernel) from [<00000000>] (0x0)
[ 400.651033] CPU1: stopping
[ 400.660247] CPU: 1 PID: 31 Comm: kworker/1:1 Tainted: G C 5.4.51-v7+ #1327
[ 400.675035] Hardware name: BCM2835
[ 400.684987] Workqueue: events set_brightness_delayed
[ 400.696439] Backtrace:
[ 400.705284] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 400.719374] r6:b924e000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 400.731570] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 400.745398] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 400.759254] r8:80da4b40 r7:00000000 r6:00000001 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 400.773412] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 400.788839] r10:00000000 r9:b924e000 r8:00000000 r7:b924fe8c r6:ffffffff r5:80000013
[ 400.803085] r4:00000001
[ 400.811866] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 400.827145] Exception stack(0xb924fe58 to 0xb924fea0)
[ 400.838525] fe40: b888c040 00000000
[ 400.853063] fe60: 00000001 00000003 00000001 b88473c0 b97d5300 b97d8500 00000000 00000040
[ 400.867568] fe80: 00000000 b924febc 00000000 b924fea8 0000028a 805803b0 80000013 ffffffff
[ 400.882023] r4:805803b0 r3:387f5dfd
[ 400.891792] [<80580378>] (gpiod_set_value_cansleep) from [<8071ba48>] (gpio_led_set+0x5c/0xb8)
[ 400.906724] r5:b8a39844 r4:b8a39844
[ 400.916547] [<8071b9ec>] (gpio_led_set) from [<8071bb24>] (gpio_led_set_blocking+0x18/0x20)
[ 400.931246] r4:b8a398ac r3:8071bb0c
[ 400.941094] [<8071bb0c>] (gpio_led_set_blocking) from [<80719fc4>] (set_brightness_delayed+0x60/0xc4)
[ 400.956754] [<80719f64>] (set_brightness_delayed) from [<8013bd94>] (process_one_work+0x17c/0x4b4)
[ 400.972150] r5:b917e080 r4:b8a398ac
[ 400.982038] [<8013bc18>] (process_one_work) from [<8013c5fc>] (worker_thread+0x54/0x5b4)
[ 400.996490] r10:b917e080 r9:b924e038 r8:80d03d00 r7:b97d5318 r6:00000008 r5:b917e094
[ 401.010677] r4:b97d5300
[ 401.019431] [<8013c5a8>] (worker_thread) from [<801429e0>] (kthread+0x13c/0x168)
[ 401.033162] r10:b926805c r9:b9147e74 r8:8013c5a8 r7:b917e080 r6:00000000 r5:b90f7080
[ 401.047322] r4:b9268040
[ 401.056096] [<801428a4>] (kthread) from [<801010ac>] (ret_from_fork+0x14/0x28)
[ 401.069662] Exception stack(0xb924ffb0 to 0xb924fff8)
[ 401.080970] ffa0: 00000000 00000000 00000000 00000000
[ 401.095497] ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 401.110007] ffe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 401.122817] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:801428a4
[ 401.136822] r4:b90f7080 r3:80104648
[ 401.146468] CPU2: stopping
[ 401.155083] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G C 5.4.51-v7+ #1327
[ 401.168975] Hardware name: BCM2835
[ 401.178211] Backtrace:
[ 401.186451] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 401.199924] r6:b913a000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 401.211468] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 401.224760] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 401.238136] r8:80da4b40 r7:00000000 r6:00000002 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 401.251876] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 401.266865] r10:00000000 r9:b913a000 r8:80d9943c r7:b913bf6c r6:ffffffff r5:60000013
[ 401.280722] r4:00000002
[ 401.289222] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 401.304224] Exception stack(0xb913bf38 to 0xb913bf80)
[ 401.315327] bf20: 80109b94 00000000
[ 401.329565] bf40: 60000093 8011a2e0 80d04f68 b913a000 80d04fb0 00000004 80d9943c 410fd034
[ 401.343827] bf60: 00000000 b913bf94 80d0535c b913bf88 00000000 80109b98 60000013 ffffffff
[ 401.358026] r4:80109b98 r3:387f5dfd
[ 401.367519] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 401.381643] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 401.395333] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 401.408959] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000002 r4:0000008a r3:387f5dfd
[ 401.422765] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 401.437909] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 401.451178] r5:00000055 r4:3912806a
[ 401.460673] CPU3: stopping
[ 401.469227] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G C 5.4.51-v7+ #1327
[ 401.483008] Hardware name: BCM2835
[ 401.492123] Backtrace:
[ 401.500184] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 401.513450] r6:b913c000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 401.524778] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 401.537780] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 401.550805] r8:80da4b40 r7:00000000 r6:00000003 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 401.564174] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 401.578832] r10:00000000 r9:b913c000 r8:80d9943c r7:b913df6c r6:ffffffff r5:60000013
[ 401.592357] r4:00000003
[ 401.600480] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 401.615080] Exception stack(0xb913df38 to 0xb913df80)
[ 401.625878] df20: 80109b94 00000000
[ 401.639932] df40: 60000093 8011a2e0 80d04f68 b913c000 80d04fb0 00000008 80d9943c 410fd034
[ 401.654031] df60: 00000000 b913df94 80d0535c b913df88 00000000 80109b98 60000013 ffffffff
[ 401.668082] r4:80109b98 r3:387f5dfd
[ 401.677532] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 401.691655] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 401.705348] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 401.719016] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000003 r4:0000008a r3:387f5dfd
[ 401.732859] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 401.748050] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 401.761402] r5:00000055 r4:3912806a
[ 401.771112] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: __netif_receive_skb_core+0xc2c/0xc34 ]---

---

model 3B+ examples

rpi login:
rpi login: [ 255.522390] Unhandled prefetch abort: unknown 1 (0x001) at 0x00000002
[ 255.528859] Internal error: : 1 [#1] SMP ARM
[ 255.533126] Modules linked in: 8021q garp sha256_generic libsha256 cfg80211 rfkill bridge stp llc ipv6 pppoe pppox ppp_generic slhc sg nft_chain_nat uas xt_MASQUERADE asix xt_nat nf_nat nfnetlink_log nft_limit bcm2835_codec(C) v4l2_mem2mem bcm2835_isp(C) bcm2835_v4l2(C) raspberrypi_hwmon bcm2835_mmal_vchiq(C) videobuf2_dma_contig videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common snd_bcm2835(C) snd_pcm snd_timer videodev snd mc vc_sm_cma(C) nft_counter uio_pdrv_genirq uio fixed xt_NFLOG xt_limit xt_state xt_comment xt_conntrack nf_conntrack nf_defrag_ipv4 nf_defrag_ipv6 xt_tcpudp nft_compat nf_tables nfnetlink ip_tables x_tables
[ 255.590338] CPU: 8 PID: -1214976164 Comm: Tainted: G C 5.4.51-v7+ #1327
[ 255.598335] Hardware name: BCM2835

rpi login:
rpi login: [ 53.880976] Bad mode in prefetch abort handler detected
[ 53.891008] Internal error: Oops - bad mode: 0 [#1] SMP ARM
[ 53.901284] Modules linked in: 8021q garp sha256_generic libsha256 cfg80211 rfkill bridge stp llc ipv6 pppoe pppox ppp_generic slhc sg nft_chain_nat xt_MASQUERADE uas cdc_ether xt_nat nf_nat r8152 nfnetlink_log nft_limit bcm2835_v4l2(C) bcm2835_codec(C) snd_bcm2835(C) bcm2835_isp(C) v4l2_mem2mem raspberrypi_hwmon bcm2835_mmal_vchiq(C) videobuf2_vmalloc videobuf2_dma_contig videobuf2_memops snd_pcm videobuf2_v4l2 videobuf2_common snd_timer videodev nft_counter snd mc vc_sm_cma(C) uio_pdrv_genirq uio fixed xt_NFLOG xt_limit xt_state xt_comment xt_conntrack nf_conntrack nf_defrag_ipv4 nf_defrag_ipv6 xt_tcpudp nft_compat nf_tables nfnetlink ip_tables x_tables
[ 53.986297] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G C 5.4.51-v7+ #1327
[ 53.999949] Hardware name: BCM2835
[ 54.009008] PC is at 0x11a09002
[ 54.017801] LR is at arch_cpu_idle+0x48/0x4c
[ 54.027709] pc : [<11a09002>] lr : [<80109bac>] psr: 200001f1
[ 54.039669] sp : b9139f40 ip : b9139f98 fp : b9139f94
[ 54.050560] r10: 00000000 r9 : 410fd034 r8 : 80d9943c
[ 54.061422] r7 : 00000002 r6 : 00003c9a r5 : b8a68498 r4 : 00000002
[ 54.073583] r3 : ffffffe6 r2 : 00000008 r1 : 00000008 r0 : b8a68400
[ 54.085689] Flags: nzCv IRQs off FIQs off Mode FIQ_32 ISA Thumb Segment kernel
[ 54.099033] Control: 10c5383d Table: 2f54c06a DAC: 00000055
[ 54.110512] Process swapper/1 (pid: 0, stack limit = 0xa701e762)
[ 54.122316] Stack: (0xb9139f40 to 0xb913a000)
[ 54.132466] 9f40: b8a68400 00000008 00000008 ffffffe6 00000002 b8a68498 00003c9a 00000002
[ 54.146560] 9f60: 80d9943c 410fd034 00000000 b9139f94 b9139f98 b9139f40 80109bac 11a09002
[ 54.160730] 9f80: 200001f1 ffffffff b9139fa4 b9139f98 808d2c84 80109b70 b9139fcc b9139fa8
[ 54.174982] 9fa0: 80153494 808d2c5c 387f5dfd 0000008a 00000001 10c0387d 80daa8f8 0000406a
[ 54.189251] 9fc0: b9139fdc b9139fd0 801537f4 801533b4 b9139ff4 b9139fe0 8010fd94 801537d8
[ 54.203538] 9fe0: 3912806a 00000055 00000000 b9139ff8 001027ac 8010fc70 00000000 00000000
[ 54.217824] Backtrace:
[ 54.226228] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 54.240391] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 54.254119] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 54.267767] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000001 r4:0000008a r3:387f5dfd
[ 54.281668] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 54.296997] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 54.310503] r5:00000055 r4:3912806a
[ 54.320268] Code: bad PC value
[ 54.329411] ---[ end trace dc65f9c3ddf436d9 ]---
[ 54.340032] Kernel panic - not syncing: Attempted to kill the idle task!
[ 54.352756] CPU0: stopping
[ 54.361417] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D C 5.4.51-v7+ #1327
[ 54.375383] Hardware name: BCM2835
[ 54.384746] Backtrace:
[ 54.393110] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 54.406809] r6:80d00000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 54.418597] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 54.432093] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 54.445487] r8:80da4b40 r7:00000000 r6:00000000 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 54.459111] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 54.473863] r10:b9fff840 r9:80d00000 r8:80d9943c r7:80d01f0c r6:ffffffff r5:60000013
[ 54.487315] r4:00000000
[ 54.495216] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 54.509623] Exception stack(0x80d01ed8 to 0x80d01f20)
[ 54.520188] 1ec0: 80109b94 00000000
[ 54.534007] 1ee0: 60000093 8011a2e0 80d04f68 80d00000 80d04fb0 00000001 80d9943c 80c68a40
[ 54.547886] 1f00: b9fff840 80d01f34 80d0535c 80d01f28 00000000 80109b98 60000013 ffffffff
[ 54.561777] r4:80109b98 r3:387f5dfd
[ 54.571018] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 54.584970] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 54.598505] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 54.612002] r8:00000000 r7:80c68a40 r6:80daa580 r5:80daa5d8 r4:000000ce r3:80d01f50
[ 54.625699] [<801537cc>] (cpu_startup_entry) from [<808cc5a8>] (rest_init+0xbc/0xc0)
[ 54.639395] [<808cc4ec>] (rest_init) from [<80c00bd8>] (arch_call_rest_init+0x18/0x1c)
[ 54.653277] r4:80d04f48 r3:80c97260
[ 54.662775] [<80c00bc0>] (arch_call_rest_init) from [<80c01090>] (start_kernel+0x4b4/0x4e8)
[ 54.677142] [<80c00bdc>] (start_kernel) from [<00000000>] (0x0)
[ 54.689046] CPU3: stopping
[ 54.697669] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G D C 5.4.51-v7+ #1327
[ 54.711574] Hardware name: BCM2835
[ 54.720858] Backtrace:
[ 54.729094] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 54.742551] r6:b913c000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 54.754043] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 54.767216] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 54.780428] r8:80da4b40 r7:00000000 r6:00000003 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 54.793997] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 54.808819] r10:00000000 r9:b913c000 r8:80d9943c r7:b913df6c r6:ffffffff r5:60000013
[ 54.822497] r4:00000003
[ 54.830766] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 54.845601] Exception stack(0xb913df38 to 0xb913df80)
[ 54.856633] df20: 80109b94 00000000
[ 54.870862] df40: 60000093 8011a2e0 80d04f68 b913c000 80d04fb0 00000008 80d9943c 410fd034
[ 54.885105] df60: 00000000 b913df94 80d0535c b913df88 00000000 80109b98 60000013 ffffffff
[ 54.899324] r4:80109b98 r3:387f5dfd
[ 54.908883] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 54.923165] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 54.936996] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 54.950725] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000003 r4:0000008a r3:387f5dfd
[ 54.964638] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 54.979955] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 54.993428] r5:00000055 r4:3912806a
[ 55.498983] SMP: failed to stop secondary CPUs
[ 55.509502] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

rpi login:
rpi login: [ 276.308059] 8<--- cut here ---
[ 276.315908] Unable to handle kernel paging request at virtual address fffffffc
[ 276.327965] pgd = 8d450aaa
[ 276.335429] [fffffffc] *pgd=39fde861, *pte=00000000, *ppte=00000000
[ 276.346557] Internal error: Oops: 837 [#1] SMP ARM
[ 276.356158] Modules linked in: 8021q garp sha256_generic libsha256 cfg80211 rfkill bridge stp llc ipv6 pppoe pppox ppp_generic slhc sg nft_chain_nat asix uas xt_MASQUERADE xt_nat nf_nat nfnetlink_log nft_limit bcm2835_v4l2(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_vmalloc bcm2835_mmal_vchiq(C) raspberrypi_hwmon videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common snd_bcm2835(C) videodev snd_pcm vc_sm_cma(C) snd_timer mc snd nft_counter uio_pdrv_genirq uio fixed xt_NFLOG xt_limit xt_state xt_comment xt_conntrack nf_conntrack nf_defrag_ipv4 nf_defrag_ipv6 xt_tcpudp nft_compat nf_tables nfnetlink ip_tables x_tables
[ 276.440666] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G C 5.4.51-v7+ #1327
[ 276.454442] Hardware name: BCM2835
[ 276.463568] PC is at _raw_read_lock+0x4/0x38
[ 276.473545] LR is at led_trigger_event+0x30/0x8c
[ 276.483880] pc : [<808d3158>] lr : [<8071b578>] psr: a0000093
[ 276.495912] sp : b9139f4c ip : b9139f50 fp : b9139f6c
[ 276.506923] r10: 00000000 r9 : 410fd034 r8 : b97d4d30
[ 276.517944] r7 : b89eec0c r6 : 00000000 r5 : b89eec00 r4 : 80e51d64
[ 276.530320] r3 : 0f0f0f0f r2 : 00000002 r1 : 00000000 r0 : b89eec0c
[ 276.542743] Flags: NzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
[ 276.555942] Control: 10c5383d Table: 34c1006a DAC: 00000055
[ 276.567698] Process swapper/1 (pid: 0, stack limit = 0x3c10ab19)
[ 276.579777] Stack: (0xb9139f4c to 0xb913a000)
[ 276.590168] 9f40: 808f3160 80e51d64 00000000 00000004 00000000
[ 276.604501] 9f60: b9139f94 b9139f70 8071d0ac 8071b554 0000000f 80d04f68 b9138000 80d04fb0
[ 276.618855] 9f80: 00000002 80d9943c b9139fa4 b9139f98 80109be8 8071d000 b9139fcc b9139fa8
[ 276.633200] 9fa0: 80153464 80109bd8 387f5dfd 0000008a 00000001 10c0387d 80daa8f8 0000406a
[ 276.647564] 9fc0: b9139fdc b9139fd0 801537f4 801533b4 b9139ff4 b9139fe0 8010fd94 801537d8
[ 276.661979] 9fe0: 3912806a 00000055 00000000 b9139ff8 001027ac 8010fc70 00000000 00000000
[ 276.676341] Backtrace:
[ 276.684830] [<8071b548>] (led_trigger_event) from [<8071d0ac>] (ledtrig_cpu+0xb8/0xf4)
[ 276.698940] r7:00000000 r6:00000004 r5:00000000 r4:80e51d64
[ 276.710816] [<8071cff4>] (ledtrig_cpu) from [<80109be8>] (arch_cpu_idle_enter+0x1c/0x20)
[ 276.725232] r8:80d9943c r7:00000002 r6:80d04fb0 r5:b9138000 r4:80d04f68 r3:0000000f
[ 276.739291] [<80109bcc>] (arch_cpu_idle_enter) from [<80153464>] (do_idle+0xbc/0x170)
[ 276.753395] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 276.767207] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000001 r4:0000008a r3:387f5dfd
[ 276.781162] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 276.796533] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 276.810062] r5:00000055 r4:3912806a
[ 276.819889] Code: 1afffff9 f57ff05b e89da800 e1a0c00d (e92dd800)
[ 276.832320] ---[ end trace 60b941bfe4de2c1e ]---
[ 276.843302] Kernel panic - not syncing: Attempted to kill the idle task!
[ 276.856486] CPU0: stopping
[ 276.865504] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D C 5.4.51-v7+ #1327
[ 276.879826] Hardware name: BCM2835
[ 276.889535] Backtrace:
[ 276.898209] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 276.911990] r6:80d00000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 276.923680] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 276.936900] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 276.949994] r8:80da4b40 r7:00000000 r6:00000000 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 276.963314] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 276.977905] r10:b9fff840 r9:80d00000 r8:80d9943c r7:80d01f0c r6:ffffffff r5:60000013
[ 276.991387] r4:00000000
[ 276.999530] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 277.014240] Exception stack(0x80d01ed8 to 0x80d01f20)
[ 277.025122] 1ec0: 80109b94 00000000
[ 277.039209] 1ee0: 60000093 8011a2e0 80d04f68 80d00000 80d04fb0 00000001 80d9943c 80c68a40
[ 277.053336] 1f00: b9fff840 80d01f34 80d0535c 80d01f28 00000000 80109b98 60000013 ffffffff
[ 277.067494] r4:80109b98 r3:387f5dfd
[ 277.077047] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 277.091232] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 277.104986] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 277.118651] r8:00000000 r7:80c68a40 r6:80daa580 r5:80daa5d8 r4:000000ce r3:80d01f50
[ 277.132528] [<801537cc>] (cpu_startup_entry) from [<808cc5a8>] (rest_init+0xbc/0xc0)
[ 277.146413] [<808cc4ec>] (rest_init) from [<80c00bd8>] (arch_call_rest_init+0x18/0x1c)
[ 277.160461] r4:80d04f48 r3:80c97260
[ 277.170093] [<80c00bc0>] (arch_call_rest_init) from [<80c01090>] (start_kernel+0x4b4/0x4e8)
[ 277.184613] [<80c00bdc>] (start_kernel) from [<00000000>] (0x0)
[ 277.196660] CPU2: stopping
[ 277.205400] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D C 5.4.51-v7+ #1327
[ 277.219417] Hardware name: BCM2835
[ 277.228785] Backtrace:
[ 277.237114] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 277.250640] r6:b913a000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 277.262223] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 277.275487] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 277.288798] r8:80da4b40 r7:00000000 r6:00000002 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 277.302438] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 277.317329] r10:00000000 r9:b913a000 r8:80d9943c r7:b913bf6c r6:ffffffff r5:60000013
[ 277.331071] r4:00000002
[ 277.339410] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 277.354261] Exception stack(0xb913bf38 to 0xb913bf80)
[ 277.365270] bf20: 80109b94 00000000
[ 277.379494] bf40: 60000093 8011a2e0 80d04f68 b913a000 80d04fb0 00000004 80d9943c 410fd034
[ 277.393733] bf60: 00000000 b913bf94 80d0535c b913bf88 00000000 80109b98 60000013 ffffffff
[ 277.407962] r4:80109b98 r3:387f5dfd
[ 277.417517] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 277.431791] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 277.445624] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 277.459348] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000002 r4:0000008a r3:387f5dfd
[ 277.473257] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 277.488568] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 277.502033] r5:00000055 r4:3912806a
[ 277.511736] CPU3: stopping
[ 277.520462] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G D C 5.4.51-v7+ #1327
[ 277.534462] Hardware name: BCM2835
[ 277.543816] Backtrace:
[ 277.552087] [<8010d458>] (dump_backtrace) from [<8010d750>] (show_stack+0x20/0x24)
[ 277.565604] r6:b913c000 r5:00000000 r4:80d93ff4 r3:387f5dfd
[ 277.577185] [<8010d730>] (show_stack) from [<808b2324>] (dump_stack+0xe0/0x124)
[ 277.590472] [<808b2244>] (dump_stack) from [<8011033c>] (handle_IPI+0x334/0x3bc)
[ 277.603763] r8:80da4b40 r7:00000000 r6:00000003 r5:80ca22a4 r4:80daa8e8 r3:387f5dfd
[ 277.617401] [<80110008>] (handle_IPI) from [<80102268>] (bcm2836_arm_irqchip_handle_irq+0xa0/0xa4)
[ 277.632323] r10:00000000 r9:b913c000 r8:80d9943c r7:b913df6c r6:ffffffff r5:60000013
[ 277.646132] r4:00000003
[ 277.654520] [<801021c8>] (bcm2836_arm_irqchip_handle_irq) from [<80101a3c>] (__irq_svc+0x5c/0x7c)
[ 277.669385] Exception stack(0xb913df38 to 0xb913df80)
[ 277.680390] df20: 80109b94 00000000
[ 277.694575] df40: 60000093 8011a2e0 80d04f68 b913c000 80d04fb0 00000008 80d9943c 410fd034
[ 277.708745] df60: 00000000 b913df94 80d0535c b913df88 00000000 80109b98 60000013 ffffffff
[ 277.722882] r4:80109b98 r3:387f5dfd
[ 277.732352] [<80109b64>] (arch_cpu_idle) from [<808d2c84>] (default_idle_call+0x34/0x48)
[ 277.746481] [<808d2c50>] (default_idle_call) from [<80153494>] (do_idle+0xec/0x170)
[ 277.760193] [<801533a8>] (do_idle) from [<801537f4>] (cpu_startup_entry+0x28/0x2c)
[ 277.773880] r8:0000406a r7:80daa8f8 r6:10c0387d r5:00000003 r4:0000008a r3:387f5dfd
[ 277.787726] [<801537cc>] (cpu_startup_entry) from [<8010fd94>] (secondary_start_kernel+0x130/0x13c)
[ 277.802931] [<8010fc64>] (secondary_start_kernel) from [<001027ac>] (0x1027ac)
[ 277.816296] r5:00000055 r4:3912806a
[ 277.826003] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

---

[brabl2]

I had same behavior on my Raspberry Pi 2B v1.1.
After reverting back to 4.19.118-v7+ everything is stable again.

[popcornmix]

Are you able to test with latest 5.4 kernel and older firmware?
You can get the previous firmware here:
https://github.com/Hexxeh/rpi-firmware/raw/2d76ecb08cbf7a4656ac102df32a5fe448c930b1/start.elf
https://github.com/Hexxeh/rpi-firmware/raw/2d76ecb08cbf7a4656ac102df32a5fe448c930b1/fixup.dat

[brabl2]

I installed all raspberrypi related packages version 1.20200723-1 from repository,
then manually installed raspberrypi-bootloader_1.20200601-1_armhf.deb package and rebooted.
It is running 5.4.51-v7+ and looking stable.

[brabl2]

I find that problem of my system was caused by the raspberrypi/firmware#1431.
After commenting out the '#arm_freq_min=400' in the /boot/config.txt
the system is stable even with latest raspberrypi-bootloader version 1.20200723-1.

[jan-h-1970]

I replaced the bootloader with the old one coming along with 4.19.118-v7+ from source:
$ wget https://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/raspberrypi-bootloader_1.20200601-1_armhf.deb
$ sudo dpkg -i raspberrypi-bootloader_1.20200601-1_armhf.deb
dpkg: warning: downgrading raspberrypi-bootloader from 1.20200723-1 to 1.20200601-1
That does the trick!
I will do now a long term test.
Thanks a lot for quick support!

I also use "arm_freq_min=400", seems to be a popular setting.
I will try tomorrow commenting out that line and try again with bootloader 1.20200723-1.

[jan-h-1970]

A first test shows, the combination of #arm_freq_min=400 and bootloader 1.20200723-1 works for me, too.

[kiff777]

I tried commenting out arm_freq_min=300 in config and it didn't hang, but there seems to be another problem.

The performance of Ip transfer, which is a major element as a router, is considerably degraded as follows.

4.19.118-v7+
DL: 83.13 Mbps
UL: 83.95 Mbps

5.4.51-v7+
DL: 73.60 Mbps
UL: 65.05 Mbps

[by]

@kiff777 : Don't you need at least arm_freq_min=1000 to guarantee the expected performance of Gigabit Ethernet? – BTW, underclocking the CPU apparently doesn't seem to conserve only a minimal amount of power.

[kiff777]

@by :
I use Pi2B as a router because the network service I contract at home is 100Mbps service.

The config has been as follows until now, but it seems that the CPU temperature is lower than doing nothing.
arm_freq_min=300
gpu_freq=200
sdram_freq=400
temp_limit=50

However, arm_freq_min=300 may not make much sense.

With the update from 4.19.118-v7+ to 5.4.51-v7+, I don't know the reason why Ip transfer throughput is so low, so I will keep it at 4.19.118-v7+ for a while.

4.19.118-v7+
DL: 83.13 Mbps
UL: 83.95 Mbps

5.4.51-v7+
DL: 73.60 Mbps
UL: 65.05 Mbps

I'm not good at English and use google translation, so I'm sorry it's hard to read.

[popcornmix]

We have a workaround in latest rpi-update firmware that will disallow arm_freq_min below 600.
A fuller fix is being worked on but will need more work/testing so will wait until after the stable release is settled.

[vmachiel]

We have a workaround in latest rpi-update firmware that will disallow arm_freq_min below 600.
A fuller fix is being worked on but will need more work/testing so will wait until after the stable release is settled.

But that fix will allow for arm_freq_min <600 again right?

[popcornmix]

Yes, the future fix will allow lower frequencies again.
But the benefit (to either power or temperature) is negligible.

[vmachiel]

Awesome thanks. I'll wait till it all appears via apt.

[vmachiel]

Is the kernel version that’s out now the one that fixes this?

[MichaIng]

Yes, the firmware packages version 1.20201022-1 have the issue mostly solved (only: on my board, over_voltage could not be lowered as much as before):

2020-12-04 13:40:52 root@micha:/tmp# cat /sys/devices/system/cpu/cpufreq/policy0/stats/time_in_state
100000 14005571
200000 74952
300000 71476
400000 53765
500000 45235
600000 63613
700000 45864
800000 50116
900000 501597

I'm just trying out the today's revision 1.20201201-1, as they might simply have lower ARM frequencies disabled: raspberrypi/firmware#1431 (comment)

... and yes indeed, arm_freq_min is now simply ignored 😢. I hope that is not a give-up on this topic as it already worked quite stable. Also increasing the minimum frequency does not work anymore.