Stack overflow (context area not valid) on ncs v2.4.2

[snowuyl]

I use nRF5340 DK to test NOR flash writing. But it failed due to stack overflow. What is meaning of context area not valid and do you have any suggestion to debug this issue?

00> [00:00:22.770,416] <err> os: ***** USAGE FAULT *****
00> [00:00:22.770,416] <err> os:   Stack overflow (context area not valid)
00> [00:00:22.770,446] <err> os: r0/a1:  0x00000001  r1/a2:  0x00000000  r2/a3:  0x20001e58[0m
00> [00:00:22.770,446] <err> os: r3/a4:  0x20004d24 r12/ip:  0x20000cc8 r14/lr:  0x000022f7
00> [00:00:22.770,477] <err> os:  xpsr:  0x81000200
00> [00:00:22.770,477] <err> os: Faulting instruction address (r15/pc): 0x0000257e
00> [00:00:22.770,507] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
00> [00:00:22.770,538] <err> os: Current thread: 0x20000c10 (flash thread)

[Turbo J]

Stack overflows tend to destroy important informtion for the RTOS to work.

Usually fixed by either turning the log level down (logs can use a ton of extra stack space) or increase the main and isr stack size in the project config.

[snowuyl]

Thanks for your reply! How to increase the main and ISR stack size in per. conf file?

[Susheel Nuguru]

check what you have for the below in your \build\zephyr\.config and increase those values in prj.conf

CONFIG_MAIN_STACK_SIZE for main stack and 

increase the stack size for the thread named "flash thread" as it shows in your log.

[snowuyl]

Thanks for your reply! Do you have suggestions about stack size?

[Susheel Nuguru]

There is  no generic answer to the stack size as it always depends on your application and can vary between application to application. You always need to know the stack sizes needed by different contexts when doing the application architecture. Check if enabling the Thread Analyzer can give you more hints on which thread is using up most of its stack so that you can increase it with something your software architect can suggest.

[snowuyl]

Thanks for your great support! No stack overflow issue after increasing stack size of flash thread to 8192.