SMP over UDP not working after update to v1.6.0 in NCS

[Leowt]

Hello,

Im using SMP over UDP (OpenThread) and after updating to v1.6.0 in NCS, sending most commands with `mcumgr-cli` makes the device restart with:

E: ***** MPU FAULT *****
E:   Stacking error (context area might be not valid)
E:   Data Access Violation
E:   MMFAR Address: 0x20016018
E: r0/a1:  0xaaaaaaaa  r1/a2:  0xaaaaaaaa  r2/a3:  0xaaaaaaaa
E: r3/a4:  0xaaaaaaaa r12/ip:  0xaaaaaaaa r14/lr:  0xaaaaaaaa
E:  xpsr:  0x61000000
E: s[ 0]:  0x00000000  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000
E: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000
E: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000
E: s[12]:  0x00000000  s[13]:  0x00000000  s[14]:  0x00000000  s[15]:  0x00000000
E: fpscr:  0xaaaaaaaa
E: Faulting instruction address (r15/pc): 0x00029708
E: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
E: Current thread: 0x20002c08 (sysworkq)

This happens for most commands, including `echo`, `image upload`, `image confirm`, etc

It works perfectly fine up until `v1.5.1`.

Is this a known issue?


Thank you

[Leowt]

smp_test.zip

you should be able to place that in the samples directory and build it.

[Leowt]

Øyvind said:

Can you please try to run addr2line -e zephyr.elf 0x00029708, which will give you the exact location that caused the issue.

ncs/modules/lib/tinycbor/src/cborparser.c:515

[Leowt]

Øyvind said:

BTW, can you also try increasing size of CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE ? 

that was it! i kept on changing it, but it got overwritten by the OVERLAY_CONFIG in the cmake file, (ncs/nrf/samples/openthread/common/overlay-ot-defaults.conf) which was setting it as 

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1120

[Øyvind]

Good to hear! Does it work as intended then?