Kernel Oops - BUG: Bad page map in process

[richardkennedy]

One of my headless clients running Debian Jessie and Kernel 4.1.8 (608c3b3e994e086d400f77469682ff1e8f346e27), became unresponsive over the weekend due to a Kernel Oops (logs below) however it's the first time I've personally come across a 'Bad page map' error, is this referencing a possible OOM event? At the time of the failure, my records show that the device had a temperature of 54.6 degrees, CPU uitlisation was at 24% and RAM utilisation was at 40%. Any insight appreciated.

Oct 10 09:47:41 device-name kernel: [90492.426587] Unable to handle kernel paging request at virtual address 00003394
Oct 10 09:47:41 device-name kernel: [90492.433809] pgd = b8724000
Oct 10 09:47:41 device-name kernel: [90492.437468] [00003394] *pgd=386a9831, *pte=00000000, *ppte=00000000
Oct 10 09:47:41 device-name kernel: [90492.443752] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
Oct 10 09:47:41 device-name kernel: [90492.449137] Modules linked in: cpufreq_stats joydev evdev bcm2835_gpiomem uio_pdrv_genirq uio snd_bcm2835 snd_pcm snd_seq snd_seq_device snd_timer snd fuse ipv6
Oct 10 09:47:41 device-name kernel: [90492.463534] CPU: 3 PID: 457 Comm: custom-script Not tainted 4.1.8-v7+ #818
Oct 10 09:47:41 device-name kernel: [90492.470046] Hardware name: BCM2709
Oct 10 09:47:41 device-name kernel: [90492.473439] task: b9361200 ti: b4816000 task.ti: b4816000
Oct 10 09:47:41 device-name kernel: [90492.478830] PC is at down_write+0x24/0x68
Oct 10 09:47:41 device-name kernel: [90492.482830] LR is at anon_vma_clone+0x84/0x1b4
Oct 10 09:47:41 device-name kernel: [90492.487264] pc : [<8055be24>]    lr : [<801268e4>]    psr: 60000013
Oct 10 09:47:41 device-name kernel: [90492.487264] sp : b4817e58  ip : b4817e70  fp : b4817e6c
Oct 10 09:47:41 device-name kernel: [90492.498717] r10: b4aa95c0  r9 : 00003390  r8 : b87c3390
Oct 10 09:47:41 device-name kernel: [90492.503929] r7 : b489d824  r6 : 00000000  r5 : b92b72c0  r4 : 00003394
Oct 10 09:47:41 device-name kernel: [90492.510440] r3 : ffff0001  r2 : a0000013  r1 : 00000001  r0 : 00003394
Oct 10 09:47:41 device-name kernel: [90492.516952] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Oct 10 09:47:41 device-name kernel: [90492.524071] Control: 10c5387d  Table: 3872406a  DAC: 00000015
Oct 10 09:47:41 device-name kernel: [90492.529802] Process custom-script (pid: 457, stack limit = 0xb4816210)
Oct 10 09:47:41 device-name kernel: [90492.535967] Stack: (0xb4817e58 to 0xb4818000)
Oct 10 09:47:41 device-name kernel: [90492.540313] 7e40:                                                       00000000 b4bc1738
Oct 10 09:47:41 device-name kernel: [90492.548476] 7e60: b4817ea4 b4817e70 801268e4 8055be0c b4817eac b489d7e8 80120da0 b4bc1738
Oct 10 09:47:41 device-name kernel: [90492.556638] 7e80: b489d7e8 b4bd1c00 00000001 808664c0 00000000 808664c0 b4817ec4 b4817ea8
Oct 10 09:47:41 device-name kernel: [90492.564800] 7ea0: 80126a48 8012686c b489d7e8 b4bc1738 b4bd1c00 00000001 b4817f4c b4817ec8
Oct 10 09:47:41 device-name kernel: [90492.572963] 7ec0: 80025084 80126a20 b4817f70 b92ba9c0 80569a28 b962d36c 76f31278 01200011
Oct 10 09:47:41 device-name kernel: [90492.581125] 7ee0: b4bc15ec b4bc15e0 b4bc15e8 b4bc15d8 b4bd1c38 b90a2578 b4af0000 00000000
Oct 10 09:47:41 device-name kernel: [90492.589288] 7f00: b4af0288 b90a2540 00000000 00000000 46b09d5e 0000524d 00000000 fffffff4
Oct 10 09:47:41 device-name kernel: [90492.597450] 7f20: b4817f3c 76f31278 00000000 01200011 00000078 00000000 00000000 00000000
Oct 10 09:47:41 device-name kernel: [90492.605612] 7f40: b4817f8c b4817f50 80025d30 800245fc 00000000 00000000 00000008 00000000
Oct 10 09:47:41 device-name kernel: [90492.613775] 7f60: b4817f78 802ff778 76f31278 00000000 76e87000 00000078 8000fb88 b4816000
Oct 10 09:47:41 device-name kernel: [90492.621937] 7f80: b4817fa4 b4817f90 8002614c 80025c90 76f31278 800d06ec 00000000 b4817fa8
Oct 10 09:47:41 device-name kernel: [90492.630099] 7fa0: 8000f980 8002612c 76f31278 00000000 01200011 00000000 00000000 00000000
Oct 10 09:47:41 device-name kernel: [90492.638261] 7fc0: 76f31278 00000000 76e87000 00000078 76f31210 00000000 000001c9 7eb1210c
Oct 10 09:47:41 device-name kernel: [90492.646424] 7fe0: 76f316d0 7eb120e0 00000000 76de9edc 60000010 01200011 00000000 00000000
Oct 10 09:47:41 device-name kernel: [90492.654595] [<8055be24>] (down_write) from [<801268e4>] (anon_vma_clone+0x84/0x1b4)
Oct 10 09:47:41 device-name kernel: [90492.662240] [<801268e4>] (anon_vma_clone) from [<80126a48>] (anon_vma_fork+0x34/0x164)
Oct 10 09:47:41 device-name kernel: [90492.670148] [<80126a48>] (anon_vma_fork) from [<80025084>] (copy_process.part.53+0xa94/0x15d0)
Oct 10 09:47:41 device-name kernel: [90492.678748] [<80025084>] (copy_process.part.53) from [<80025d30>] (do_fork+0xac/0x3ec)
Oct 10 09:47:41 device-name kernel: [90492.686653] [<80025d30>] (do_fork) from [<8002614c>] (SyS_clone+0x2c/0x34)
Oct 10 09:47:41 device-name kernel: [90492.693520] [<8002614c>] (SyS_clone) from [<8000f980>] (ret_fast_syscall+0x0/0x54)
Oct 10 09:47:41 device-name kernel: [90492.701076] Code: e1a04000 f57ff05b f590f000 e59f303c (e1902f9f) 
Oct 10 09:47:41 device-name kernel: [90492.710916] ---[ end trace b67b90c0f8edd4cc ]---
Oct 10 09:47:45 device-name kernel: [90496.954752] swap_free: Bad swap file entry 01010800
Oct 10 09:47:45 device-name kernel: [90496.959665] BUG: Bad page map in process ssh-agent  pte:80840000 pmd:387c2831
Oct 10 09:47:45 device-name kernel: [90496.966845] addr:7edb4000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efe0
Oct 10 09:47:45 device-name kernel: [90496.975158] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:45 device-name kernel: [90496.981873] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G      D         4.1.8-v7+ #818
Oct 10 09:47:45 device-name kernel: [90496.989730] Hardware name: BCM2709
Oct 10 09:47:45 device-name kernel: [90496.993172] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:45 device-name kernel: [90497.000956] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:45 device-name kernel: [90497.008222] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:45 device-name kernel: [90497.015923] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:45 device-name kernel: [90497.024112] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:45 device-name kernel: [90497.031891] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:45 device-name kernel: [90497.039169] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:45 device-name kernel: [90497.045915] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:45 device-name kernel: [90497.052635] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:45 device-name kernel: [90497.059910] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:45 device-name kernel: [90497.067609] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:45 device-name kernel: [90497.074876] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:45 device-name kernel: [90497.082461] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:45 device-name kernel: [90497.090234] swap_free: Bad swap file entry 01034800
Oct 10 09:47:45 device-name kernel: [90497.095156] BUG: Bad page map in process ssh-agent  pte:81a40000 pmd:387c2831
Oct 10 09:47:45 device-name kernel: [90497.102298] addr:7edb5000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efe1
Oct 10 09:47:45 device-name kernel: [90497.110587] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:45 device-name kernel: [90497.117375] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:45 device-name kernel: [90497.125240] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90497.128700] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90497.136501] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90497.143743] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90497.151436] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90497.159679] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90497.167462] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90497.174732] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90497.181450] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:46 device-name kernel: [90497.188192] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:46 device-name kernel: [90497.195467] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:46 device-name kernel: [90497.203144] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:46 device-name kernel: [90497.210436] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:46 device-name kernel: [90497.218063] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:46 device-name kernel: [90497.225840] swap_free: Bad swap file entry 0170f600
Oct 10 09:47:46 device-name kernel: [90497.230734] BUG: Bad page map in process ssh-agent  pte:b87b0000 pmd:387c2831
Oct 10 09:47:46 device-name kernel: [90497.237898] addr:7edba000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efe6
Oct 10 09:47:46 device-name kernel: [90497.246246] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:46 device-name kernel: [90497.252965] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:46 device-name kernel: [90497.260860] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90497.264296] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90497.272078] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90497.279343] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90497.287040] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90497.295261] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90497.303019] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90497.310282] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90497.317020] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:46 device-name kernel: [90497.323736] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:46 device-name kernel: [90497.330988] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:46 device-name kernel: [90497.338696] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:46 device-name kernel: [90497.345959] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:46 device-name kernel: [90497.353546] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:46 device-name kernel: [90497.361315] swap_free: Bad swap file entry 0100d400
Oct 10 09:47:46 device-name kernel: [90497.366233] BUG: Bad page map in process ssh-agent  pte:806a0000 pmd:387c2831
Oct 10 09:47:46 device-name kernel: [90497.373401] addr:7edbb000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efe7
Oct 10 09:47:46 device-name kernel: [90497.381715] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:46 device-name kernel: [90497.388451] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:46 device-name kernel: [90497.396317] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90497.399745] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90497.407531] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90497.414807] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90497.422480] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90497.430696] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90497.438489] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90497.445752] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90497.452516] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:46 device-name kernel: [90497.459282] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:46 device-name kernel: [90497.466622] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:46 device-name kernel: [90497.474296] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:46 device-name kernel: [90497.481568] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:46 device-name kernel: [90497.489182] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:46 device-name kernel: [90497.496976] swap_free: Bad swap file entry 0170f600
Oct 10 09:47:46 device-name kernel: [90497.501873] BUG: Bad page map in process ssh-agent  pte:b87b0000 pmd:387c2831
Oct 10 09:47:46 device-name kernel: [90497.509042] addr:7edbd000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efe9
Oct 10 09:47:46 device-name kernel: [90497.517351] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:46 device-name kernel: [90497.524065] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:46 device-name kernel: [90497.531927] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90497.535392] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90497.543143] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90497.550402] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90497.558106] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90497.566317] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90497.574087] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90497.581366] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90497.588119] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:46 device-name kernel: [90497.594861] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:46 device-name kernel: [90497.602104] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:46 device-name kernel: [90497.609807] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:46 device-name kernel: [90497.617088] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:46 device-name kernel: [90497.624702] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:46 device-name kernel: [90497.632456] swap_free: Bad swap file entry 0170f600
Oct 10 09:47:46 device-name kernel: [90497.637362] BUG: Bad page map in process ssh-agent  pte:b87b0000 pmd:387c2831
Oct 10 09:47:46 device-name kernel: [90497.644541] addr:7edbe000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efea
Oct 10 09:47:46 device-name kernel: [90497.652809] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:46 device-name kernel: [90497.659543] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:46 device-name kernel: [90497.667404] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90497.670833] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90497.678616] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90497.685888] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90497.693618] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90497.701841] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90497.709692] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90497.716967] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90497.723693] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:46 device-name kernel: [90497.730448] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:46 device-name kernel: [90497.737725] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:46 device-name kernel: [90497.745430] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:46 device-name kernel: [90497.752674] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:46 device-name kernel: [90497.760284] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:46 device-name kernel: [90497.768065] swap_free: Bad swap file entry 006ca400
Oct 10 09:47:46 device-name kernel: [90497.772956] BUG: Bad page map in process ssh-agent  pte:36520000 pmd:387c2831
Oct 10 09:47:46 device-name kernel: [90497.780128] addr:7edc0000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efec
Oct 10 09:47:46 device-name kernel: [90497.788421] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:46 device-name kernel: [90497.795156] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:46 device-name kernel: [90497.802996] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90497.806450] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90497.814212] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90497.821480] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90497.829178] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90497.837396] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90497.845188] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90497.852423] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90497.859168] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:46 device-name kernel: [90497.865931] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:46 device-name kernel: [90497.873165] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:46 device-name kernel: [90497.880860] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:46 device-name kernel: [90497.888150] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:46 device-name kernel: [90497.895773] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:46 device-name kernel: [90497.903522] swap_free: Bad swap file entry 0100ac00
Oct 10 09:47:46 device-name kernel: [90497.908437] BUG: Bad page map in process ssh-agent  pte:80560000 pmd:387c2831
Oct 10 09:47:46 device-name kernel: [90497.915609] addr:7edc2000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efee
Oct 10 09:47:46 device-name kernel: [90497.923872] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:46 device-name kernel: [90497.930623] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:46 device-name kernel: [90497.938479] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90497.941903] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90497.949696] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90497.956967] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90497.964669] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90497.972858] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90497.980633] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90497.987930] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90497.994729] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:46 device-name kernel: [90498.001453] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:46 device-name kernel: [90498.008761] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:46 device-name kernel: [90498.016473] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:46 device-name kernel: [90498.023708] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:46 device-name kernel: [90498.031321] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:46 device-name kernel: [90498.039092] swap_free: Bad swap file entry 01010800
Oct 10 09:47:46 device-name kernel: [90498.043977] BUG: Bad page map in process ssh-agent  pte:80840000 pmd:387c2831
Oct 10 09:47:46 device-name kernel: [90498.051165] addr:7edc8000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7eff4
Oct 10 09:47:46 device-name kernel: [90498.059455] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:46 device-name kernel: [90498.066193] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:46 device-name kernel: [90498.074028] Hardware name: BCM2709
Oct 10 09:47:46 device-name kernel: [90498.077481] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:46 device-name kernel: [90498.085273] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:46 device-name kernel: [90498.092509] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:46 device-name kernel: [90498.100201] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:46 device-name kernel: [90498.108430] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:46 device-name kernel: [90498.116252] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:46 device-name kernel: [90498.123501] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:46 device-name kernel: [90498.130271] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:47 device-name kernel: [90498.137022] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:47 device-name kernel: [90498.144267] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:47 device-name kernel: [90498.151972] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:47 device-name kernel: [90498.159252] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:47 device-name kernel: [90498.166869] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:47 device-name kernel: [90498.174649] swap_free: Bad swap file entry 01024800
Oct 10 09:47:47 device-name kernel: [90498.179540] BUG: Bad page map in process ssh-agent  pte:81240000 pmd:387c2831
Oct 10 09:47:47 device-name kernel: [90498.186711] addr:7edc9000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7eff5
Oct 10 09:47:47 device-name kernel: [90498.195007] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:47 device-name kernel: [90498.201718] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:47 device-name kernel: [90498.209581] Hardware name: BCM2709
Oct 10 09:47:47 device-name kernel: [90498.213017] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:47 device-name kernel: [90498.220819] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:47 device-name kernel: [90498.228085] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:47 device-name kernel: [90498.235781] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:47 device-name kernel: [90498.243979] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:47 device-name kernel: [90498.251771] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:47 device-name kernel: [90498.259038] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:47 device-name kernel: [90498.265790] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:47 device-name kernel: [90498.272499] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:47 device-name kernel: [90498.279762] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:47 device-name kernel: [90498.287472] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:47 device-name kernel: [90498.294738] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:47 device-name kernel: [90498.302317] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:47 device-name kernel: [90498.310097] swap_free: Bad swap file entry 0170f600
Oct 10 09:47:47 device-name kernel: [90498.315011] BUG: Bad page map in process ssh-agent  pte:b87b0000 pmd:387c2831
Oct 10 09:47:47 device-name kernel: [90498.322155] addr:7edce000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7effa
Oct 10 09:47:47 device-name kernel: [90498.330459] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:47 device-name kernel: [90498.337192] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:47 device-name kernel: [90498.345069] Hardware name: BCM2709
Oct 10 09:47:47 device-name kernel: [90498.348493] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:47 device-name kernel: [90498.356276] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:47 device-name kernel: [90498.363517] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:47 device-name kernel: [90498.371229] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:47 device-name kernel: [90498.379466] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:47 device-name kernel: [90498.387251] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:47 device-name kernel: [90498.394526] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:47 device-name kernel: [90498.401245] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:47 device-name kernel: [90498.407995] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:47 device-name kernel: [90498.415262] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:47 device-name kernel: [90498.422932] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:47 device-name kernel: [90498.430186] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:47 device-name kernel: [90498.437805] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:47 device-name kernel: [90498.445590] swap_free: Bad swap file entry 0100d400
Oct 10 09:47:47 device-name kernel: [90498.450472] BUG: Bad page map in process ssh-agent  pte:806a0000 pmd:387c2831
Oct 10 09:47:47 device-name kernel: [90498.457639] addr:7edcf000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7effb
Oct 10 09:47:47 device-name kernel: [90498.465937] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:47 device-name kernel: [90498.472644] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:47 device-name kernel: [90498.480501] Hardware name: BCM2709
Oct 10 09:47:47 device-name kernel: [90498.483936] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:47 device-name kernel: [90498.491714] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:47 device-name kernel: [90498.498992] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:47 device-name kernel: [90498.506692] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:47 device-name kernel: [90498.514918] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:47 device-name kernel: [90498.522666] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:47 device-name kernel: [90498.529932] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:47 device-name kernel: [90498.536671] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:47 device-name kernel: [90498.543380] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:47 device-name kernel: [90498.550684] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:47 device-name kernel: [90498.558401] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:47 device-name kernel: [90498.565694] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:47 device-name kernel: [90498.573277] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:47 device-name kernel: [90498.581073] swap_free: Bad swap file entry 0170f600
Oct 10 09:47:47 device-name kernel: [90498.586009] BUG: Bad page map in process ssh-agent  pte:b87b0000 pmd:387c2831
Oct 10 09:47:47 device-name kernel: [90498.593153] addr:7edd0000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7effc
Oct 10 09:47:47 device-name kernel: [90498.601447] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:47 device-name kernel: [90498.608190] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:47 device-name kernel: [90498.616057] Hardware name: BCM2709
Oct 10 09:47:47 device-name kernel: [90498.619488] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:47 device-name kernel: [90498.627278] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:47 device-name kernel: [90498.634557] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:47 device-name kernel: [90498.642225] [<8011ab9c>] (print_bad_pte) from [<8011c570>] (unmap_single_vma+0x55c/0x588)
Oct 10 09:47:47 device-name kernel: [90498.650443] [<8011c570>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:47 device-name kernel: [90498.658232] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:47 device-name kernel: [90498.665550] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:47 device-name kernel: [90498.672275] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:47 device-name kernel: [90498.679053] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:47 device-name kernel: [90498.686320] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:47 device-name kernel: [90498.694007] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:47 device-name kernel: [90498.701279] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:47 device-name kernel: [90498.708894] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:47 device-name kernel: [90498.716677] BUG: Bad page map in process ssh-agent  pte:b87b87dd pmd:387c2831
Oct 10 09:47:47 device-name kernel: [90498.723830] addr:7edd2000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7effe
Oct 10 09:47:47 device-name kernel: [90498.732141] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:47 device-name kernel: [90498.738882] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:47 device-name kernel: [90498.746748] Hardware name: BCM2709
Oct 10 09:47:47 device-name kernel: [90498.750173] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:47 device-name kernel: [90498.757956] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:47 device-name kernel: [90498.765227] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:47 device-name kernel: [90498.772893] [<8011ab9c>] (print_bad_pte) from [<8011bfbc>] (vm_normal_page+0x64/0xbc)
Oct 10 09:47:47 device-name kernel: [90498.780771] [<8011bfbc>] (vm_normal_page) from [<8011c2c4>] (unmap_single_vma+0x2b0/0x588)
Oct 10 09:47:47 device-name kernel: [90498.789083] [<8011c2c4>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:47 device-name kernel: [90498.796868] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:47 device-name kernel: [90498.804116] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:47 device-name kernel: [90498.810856] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:47 device-name kernel: [90498.817599] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:47 device-name kernel: [90498.824866] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:47 device-name kernel: [90498.832540] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:47 device-name kernel: [90498.839805] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:47 device-name kernel: [90498.847426] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:47 device-name kernel: [90498.855213] BUG: Bad page map in process ssh-agent  pte:0000175f pmd:387c2831
Oct 10 09:47:47 device-name kernel: [90498.862360] page:b9fa6024 count:1 mapcount:-1 mapping:  (null) index:0x0
Oct 10 09:47:47 device-name kernel: [90498.869090] flags: 0x414(referenced|dirty|reserved)
Oct 10 09:47:47 device-name kernel: [90498.874042] page dumped because: bad pte
Oct 10 09:47:47 device-name kernel: [90498.878018] addr:7edd3000 vm_flags:00100173 anon_vma:b86e1870 mapping:  (null) index:7efff
Oct 10 09:47:47 device-name kernel: [90498.886329] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Oct 10 09:47:47 device-name kernel: [90498.893047] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:47 device-name kernel: [90498.900907] Hardware name: BCM2709
Oct 10 09:47:47 device-name kernel: [90498.904341] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:47 device-name kernel: [90498.912134] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:47 device-name kernel: [90498.919407] [<80558600>] (dump_stack) from [<8011ab9c>] (print_bad_pte+0x130/0x1a8)
Oct 10 09:47:47 device-name kernel: [90498.927111] [<8011ab9c>] (print_bad_pte) from [<8011c558>] (unmap_single_vma+0x544/0x588)
Oct 10 09:47:47 device-name kernel: [90498.935338] [<8011c558>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:47 device-name kernel: [90498.943101] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:47 device-name kernel: [90498.950369] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:47 device-name kernel: [90498.957128] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:47 device-name kernel: [90498.963843] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:47 device-name kernel: [90498.971111] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:47 device-name kernel: [90498.978821] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:47 device-name kernel: [90498.986090] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:47 device-name kernel: [90498.993680] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:47 device-name kernel: [90499.001604] BUG: Bad page state in process ssh-agent  pfn:00001
Oct 10 09:47:47 device-name kernel: [90499.007562] page:b9fa6024 count:0 mapcount:-1 mapping:  (null) index:0x0
Oct 10 09:47:47 device-name kernel: [90499.014277] flags: 0x414(referenced|dirty|reserved)
Oct 10 09:47:47 device-name kernel: [90499.019265] page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Oct 10 09:47:47 device-name kernel: [90499.025740] bad because of flags:
Oct 10 09:47:47 device-name kernel: [90499.029069] flags: 0x400(reserved)
Oct 10 09:47:47 device-name kernel: [90499.032594] Modules linked in: cpufreq_stats joydev evdev bcm2835_gpiomem uio_pdrv_genirq uio snd_bcm2835 snd_pcm snd_seq snd_seq_device snd_timer snd fuse ipv6
Oct 10 09:47:47 device-name kernel: [90499.047289] CPU: 0 PID: 1101 Comm: ssh-agent Tainted: G    B D         4.1.8-v7+ #818
Oct 10 09:47:47 device-name kernel: [90499.055151] Hardware name: BCM2709
Oct 10 09:47:47 device-name kernel: [90499.058599] [<80018440>] (unwind_backtrace) from [<80013e0c>] (show_stack+0x20/0x24)
Oct 10 09:47:47 device-name kernel: [90499.066392] [<80013e0c>] (show_stack) from [<80558600>] (dump_stack+0x98/0xe0)
Oct 10 09:47:47 device-name kernel: [90499.073636] [<80558600>] (dump_stack) from [<800f7444>] (bad_page+0xc8/0x128)
Oct 10 09:47:47 device-name kernel: [90499.080837] [<800f7444>] (bad_page) from [<800f771c>] (free_pages_prepare+0x278/0x2ac)
Oct 10 09:47:47 device-name kernel: [90499.088808] [<800f771c>] (free_pages_prepare) from [<800f9838>] (free_hot_cold_page+0x34/0x1c8)
Oct 10 09:47:47 device-name kernel: [90499.097562] [<800f9838>] (free_hot_cold_page) from [<800f9a20>] (free_hot_cold_page_list+0x54/0xd8)
Oct 10 09:47:47 device-name kernel: [90499.106652] [<800f9a20>] (free_hot_cold_page_list) from [<801004e4>] (release_pages+0x20c/0x244)
Oct 10 09:47:47 device-name kernel: [90499.115480] [<801004e4>] (release_pages) from [<8012e2ac>] (free_pages_and_swap_cache+0x68/0x94)
Oct 10 09:47:48 device-name kernel: [90499.124277] [<8012e2ac>] (free_pages_and_swap_cache) from [<8011c41c>] (unmap_single_vma+0x408/0x588)
Oct 10 09:47:48 device-name kernel: [90499.133538] [<8011c41c>] (unmap_single_vma) from [<8011d3c8>] (unmap_vmas+0x64/0x78)
Oct 10 09:47:48 device-name kernel: [90499.141322] [<8011d3c8>] (unmap_vmas) from [<801239d8>] (exit_mmap+0xe8/0x1f0)
Oct 10 09:47:48 device-name kernel: [90499.148585] [<801239d8>] (exit_mmap) from [<80024348>] (mmput+0x50/0xf4)
Oct 10 09:47:48 device-name kernel: [90499.155334] [<80024348>] (mmput) from [<80028c30>] (do_exit+0x2c0/0xa64)
Oct 10 09:47:48 device-name kernel: [90499.162044] [<80028c30>] (do_exit) from [<80029470>] (do_group_exit+0x50/0xcc)
Oct 10 09:47:48 device-name kernel: [90499.169329] [<80029470>] (do_group_exit) from [<80033ed4>] (get_signal+0x2b0/0x6e0)
Oct 10 09:47:48 device-name kernel: [90499.177030] [<80033ed4>] (get_signal) from [<80013194>] (do_signal+0x98/0x3ac)
Oct 10 09:47:48 device-name kernel: [90499.184267] [<80013194>] (do_signal) from [<80013690>] (do_work_pending+0xb8/0xc8)
Oct 10 09:47:48 device-name kernel: [90499.191881] [<80013690>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Oct 10 09:47:48 device-name kernel: [90499.199968] BUG: Bad rss-counter state mm:b9234e00 idx:0 val:-1
Oct 10 09:47:48 device-name kernel: [90499.205962] BUG: Bad rss-counter state mm:b9234e00 idx:1 val:2
Oct 10 09:47:48 device-name kernel: [90499.211811] BUG: Bad rss-counter state mm:b9234e00 idx:2 val:-13

[pelwell]

Are you overclocking anything - ARM, SDRAM or GPU?

[richardkennedy]

Yep (see below), the device is currently set to the 'Pi2' overclocking profile via raspi-config. I was concerned about that being a potential cause yesterday evening, so I ran approximately 2 hours of stress tests (OpenGL, CPU/Storage) but I failed to replicate any form of instability so personally dismissed it as a potential cause.

/boot/config.txt
arm_freq=1000
core_freq=500
sdram_freq=500
over_voltage=2

[popcornmix]

Can you remove the overclock and see if you get the kernel panic.
Turbo mode is not stable on many Pi2's.

[alexara]

I had the same issue using overclock

arm_freq=1000
gpu_mem=128
core_freq=500
sdram_freq=500
over_voltage=2

Nov  1 16:25:28 raspberrypi2 kernel: [14047.105525] BUG: Bad page map in process beam.smp  pte:2514155f pmd:2fce2831
Nov  1 16:25:28 raspberrypi2 kernel: [14047.113349] page:b656cd24 count:1 mapcount:-1 mapping:a5c00bac index:0x72
Nov  1 16:25:28 raspberrypi2 kernel: [14047.120973] flags: 0x2027c(referenced|uptodate|dirty|lru|active|arch_1|mappedtodisk)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.130740] page dumped because: bad pte
Nov  1 16:25:28 raspberrypi2 kernel: [14047.135583] addr:72c3d000 vm_flags:00100077 anon_vma:b51f3270 mapping:  (null) index:72c3d
Nov  1 16:25:28 raspberrypi2 kernel: [14047.146158] file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.154270] CPU: 2 PID: 3502 Comm: beam.smp Not tainted 4.1.12-v7+ #824
Nov  1 16:25:28 raspberrypi2 kernel: [14047.162192] Hardware name: BCM2709
Nov  1 16:25:28 raspberrypi2 kernel: [14047.166486] [<80018444>] (unwind_backtrace) from [<80013e08>] (show_stack+0x20/0x24)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.176147] [<80013e08>] (show_stack) from [<80557fb4>] (dump_stack+0x98/0xe0)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.184430] [<80557fb4>] (dump_stack) from [<8011a858>] (print_bad_pte+0x130/0x1a8)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.194346] [<8011a858>] (print_bad_pte) from [<8011c168>] (unmap_single_vma+0x544/0x588)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.204782] [<8011c168>] (unmap_single_vma) from [<8011cfdc>] (unmap_vmas+0x64/0x78)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.214967] [<8011cfdc>] (unmap_vmas) from [<801235e8>] (exit_mmap+0xe8/0x1f0)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.223549] [<801235e8>] (exit_mmap) from [<80024360>] (mmput+0x50/0xf4)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.231584] [<80024360>] (mmput) from [<80028c7c>] (do_exit+0x2c0/0xa64)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.239598] [<80028c7c>] (do_exit) from [<800294b8>] (do_group_exit+0x4c/0xcc)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.248106] [<800294b8>] (do_group_exit) from [<80033f1c>] (get_signal+0x2b0/0x6e0)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.258290] [<80033f1c>] (get_signal) from [<80013190>] (do_signal+0x98/0x3ac)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.266850] [<80013190>] (do_signal) from [<8001368c>] (do_work_pending+0xb8/0xc8)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.276974] [<8001368c>] (do_work_pending) from [<8000f9e4>] (work_pending+0xc/0x20)
Nov  1 16:25:28 raspberrypi2 kernel: [14047.287303] Disabling lock debugging due to kernel taint
Nov  1 16:25:28 raspberrypi2 kernel: [14047.294303] BUG: Bad page state in process beam.smp  pfn:25141
Nov  1 16:25:28 raspberrypi2 kernel: [14047.301488] page:b656cd24 count:0 mapcount:-1 mapping:a5c00bac index:0x72

I removed the overlock now and report back as well in case the kernel Oops happens again.

[popcornmix]

@richardkennedy have you tested without overclock?

[richardkennedy]

Not entirely, reduced it to 900Mhz with a core frequency of 250, sdram of 450 and an over voltage of 2. Still monitoring at the moment, I'll go through my logs this evening to see how it's performing.

[popcornmix]

The most likely issue is the sdram_freq. If it seems stable with no overclock, you may well be okay with the arm and core overclocks in place, but the sdram overclock disabled. (My guess is that >90% of Pi2's can handle the core and arm overclock, but perhaps only 50% can handle the sdram overclock reliably).

But first, make sure everything is stable without any overclock.

[Ruffio]

@richardkennedy how did this end up? Can this issue be closed? Please do so, if it has been resolved or provide further information for investigation. Thanks.

[Ruffio]

@popcornmix this issue looks like it was caused by overclocking sdram. It should be closed as there have been no response to your suggestion 1 Nov 2015