Segmentation fault (core dumped)，when using devsdk_post_readings function to deliver a json message

[yeehecan]

Hi all:
I tried to using devsdk_post_readings function to deliver some json message,but get a Segmentation fault (core dumped)

I debug into device-sdk-c source , The error occurs in bus.c at line 101 , during the 'edgex_bus_post' function building the message envelope and setting the 'correlationID' property , It seems that edgex_device_get_crlid () always return NULL.

i added some code to check if the edgex_device_get_crlid () returns null , and replace it with a uuid if empty ，problem solved， but I don't know if it will have any other impact.

i`m using a ubuntu22.04 docker container as the development environment. and device-csdk-c version 3.0.0

gdb debug message:
(gdb) bt
#0 0x00007f195a834a7c in pthread_kill () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007f195a7e0476 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007f195a7c67f3 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007f195a7c671b in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#4 0x00007f195a7d7e96 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
#5 0x00007f195aaaad39 in iot_data_alloc_string (val=0x0, ownership=IOT_DATA_REF) at /workspace/src/device-sdk-c/src/iotech-c-utils/src/c/data.c:1403
#6 0x00007f195aadcd51 in edgex_bus_post (bus=0x558f66d108c0,
path=0x558f66d28310 "edgex/events/device/device-iec104-msater/lensyn-iec104-master/104_slave_1/JSON", payload=0x558f66d2e1c0)
at /workspace/src/device-sdk-c/src/c/bus.c:101
#7 0x00007f195aae3956 in edgex_data_client_add_event (client=0x558f66d108c0, ev=0x558f66d2d550, metrics=0x558f66d10510)
at /workspace/src/device-sdk-c/src/c/data.c:190
#8 0x00007f195ab014e7 in devsdk_post_readings (svc=0x558f66d10320, devname=0x558f6537b358 "104_slave_1", resname=0x558f6537b353 "JSON", values=0x7ffc3173adb0)
at /workspace/src/device-sdk-c/src/c/service.c:1057
#9 0x0000558f65362eba in main (argc=1, argv=0x7ffc3173af78) at /workspace/src/device-iec104-master.c:628

Has anyone had the same problem,Help me.

I have poor English ， I don't know if it's clearly expressed, sorry。

[iain-anderson]

yes, that looks to be the problem. devsdk_post_readings() needs to call edgex_device_alloc_crlid (NULL) before pushing the event, and edgex_device_free_crlid () afterwards.