RE: crashes after 15 hours publishing messages with mqtt helper

Marbro1965 — Mon, 16 Dec 2024 08:54:09 GMT

Hi Hakon,

I studied a little bit addr2line. I got some problem to understand (((.

Anyway you intuition was perfect as I doubled the stack size of thread processing mqtt publish and subscribe and I had more than one day working without crash.

I think that was the problem. Anyway I should add a name to thread and link button to a kernel panic error to practice on addr2line tool.

I think ticket can be closed.

Best regards.

RE: crashes after 15 hours publishing messages with mqtt helper

Håkon Alseth — Mon, 16 Dec 2024 08:28:04 GMT

Hi,

Which thread was the faulting one(s)?

Did you check the assert output (SP and LR content) and use addr2line / checked the zephyr.map file?

[quote user="hkn"]

Have you tried to use addr2line to backtrace where the fault was called from? And what thread(s) are in-use (search for current thread address in the zephyr.map file) ?

Here's a howto on addr2line usage: https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-2-debugging/topic/exercise-2-11/

[/quote]

Kind regards,

Håkon

RE: crashes after 15 hours publishing messages with mqtt helper

Marbro1965 — Fri, 13 Dec 2024 20:24:47 GMT

Unfortunately I was not able to debug. I did not enable in prj file. But I will do. Anyway your suggestion about stack overflow is helping a lot.

Best.

RE: crashes after 15 hours publishing messages with mqtt helper

Håkon Alseth — Fri, 13 Dec 2024 12:48:57 GMT

Hi,

[quote user=""]ASSERTION FAIL [ret == 0] @ WEST_TOPDIR/zephyr/subsys/net/lib/mqtt/mqtt_os.h:61
sys_mutex_unlock failed with -22[/quote]

errno 22 is EINVAL, and the docs for the mutex unlock function states:

https://github.com/nrfconnect/sdk-zephyr/blob/v3.7.99-ncs1/include/zephyr/sys/mutex.h#L108-L124

* @retval -EINVAL Provided mutex not recognized by the kernel or mutex wasn't
* locked

This indicates that the pointer going into the function is somehow corrupted, usually due to a stack overflow or similar. The thread its being called from seems to differ between the two logs:

[quote user=""][13:55:55.165,130] <err> os: r0/a1: 0x00000004 r1/a2: 0x0000003d r2/a3: 0x00000004
[13:55:55.165,130] <err> os: r3/a4: 0x00000004 r12/ip: 0x0000000c r14/lr: 0x00021397
[13:55:55.165,161] <err> os: xpsr: 0x01000000
[13:55:55.165,161] <err> os: s[ 0]: 0x20011c78 s[ 1]: 0x0003bb85 s[ 2]: 0x00000000 s[ 3]: 0x20011c78
[13:55:55.165,191] <err> os: s[ 4]: 0x20012838 s[ 5]: 0x00027cbf s[ 6]: 0x00000000 s[ 7]: 0x00000000
[13:55:55.165,222] <err> os: s[ 8]: 0x00000000 s[ 9]: 0x00000001 s[10]: 0x20017818 s[11]: 0x0001365f
[13:55:55.165,252] <err> os: s[12]: 0x00000000 s[13]: 0x0001365f s[14]: 0x20017828 s[15]: 0x0001366f
[13:55:55.165,283] <err> os: fpscr: 0x2000f1c8
[13:55:55.165,283] <err> os: Faulting instruction address (r15/pc): 0x000359ec
[13:55:55.165,313] <err> os: >>> ZEPHYR FATAL ERROR 4: Kernel panic on CPU 0
[13:55:55.165,344] <err> os: Current thread: 0x2000f1c8 (unknown)[/quote]

[quote user=""][12:01:59.972,900] <err> os: r0/a1: 0x00000004 r1/a2: 0x0000003d r2/a3: 0x00000003
[12:01:59.972,930] <err> os: r3/a4: 0x00000004 r12/ip: 0x0000000c r14/lr: 0x0002136b
[12:01:59.972,930] <err> os: xpsr: 0x01000000
[12:01:59.972,961] <err> os: s[ 0]: 0x20011d1c s[ 1]: 0x0003ba05 s[ 2]: 0x00000000 s[ 3]: 0x20011d1c
[12:01:59.972,991] <err> os: s[ 4]: 0x200128cc s[ 5]: 0x00027cbf s[ 6]: 0x00000000 s[ 7]: 0x00000000
[12:01:59.972,991] <err> os: s[ 8]: 0x00000000 s[ 9]: 0x00000001 s[10]: 0x20017c8c s[11]: 0x00013633
[12:01:59.973,022] <err> os: s[12]: 0x00000000 s[13]: 0x00013633 s[14]: 0x001de893 s[15]: 0x00000000
[12:01:59.973,052] <err> os: fpscr: 0x20017cb0
[12:01:59.973,052] <err> os: Faulting instruction address (r15/pc): 0x0003586c
[12:02:45.467,498] <err> os: >>> ZEPHYR FATAL ERROR 4: Kernel panic on CPU 0
[12:02:52.951,721] <err> os: Current thread: 0x2000f278 (unknown)[/quote]

Have you tried to use addr2line to backtrace where the fault was called from? And what thread(s) are in-use (search for current thread address in the zephyr.map file) ?

Here's a howto on addr2line usage: https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-2-debugging/topic/exercise-2-11/

Kind regards,

Håkon