[Bug] CONFIG_LOG_MODE_IMMEDIATE Crashed z_pub.c

[ypearson-bdai]

Describe the bug

Adding CONFIG_LOG_MODE_IMMEDIATE=y to prj.conf seems to crash the z_pub.c example

*** Booting Zephyr OS build zephyr-v30600 ***
[00:00:00.017,000] <inf> net_config: Initializing network
[00:00:00.025,000] <inf> net_config: Waiting interface 1 (0x20021d24) to be up...
[00:00:00.512,000] <inf> net_config: Interface 1 (0x20021d24) coming up
[00:00:00.521,000] <inf> net_config: IPv4 address: 192.168.11.2
[00:00:00.630,000] <err> os: ***** MPU FAULT *****
[00:00:00.638,000] <err> os:   Stacking error (context area might be not valid)
[00:00:00.648,000] <err> os:   Data Access Violation
[00:00:00.656,000] <err> os:   MMFAR Address: 0x2002a1b8
[00:00:00.664,000] <err> os: r0/a1:  0x8dd06373  r1/a2:  0x1586e719  r2/a3:  0xb767a161
[00:00:00.675,000] <err> os: r3/a4:  0x46c0b7de r12/ip:  0xaaaaaaaa r14/lr:  0xaaaaaaaa
[00:00:00.686,000] <err> os:  xpsr:  0xaaaaaa00
[00:00:00.693,000] <err> os: Faulting instruction address (r15/pc): 0xaaaaaaaa
[00:00:00.703,000] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
[00:00:00.713,000] <err> os: Current thread: 0x20022840 (net_mgmt)
[00:00:00.722,000] <err> os: Halting system

To reproduce

1. Use Zenoh pico z_pub.c example
2. Add CONFIG_LOG_MODE_IMMEDIATE=y to prj.conf
3. Flash on STM32 F767
4. Reset PCB, and picocom -b 115200 /dev/ttyUSB0
5. Observe crash

platformio.ini

[env:nucleo_f767zi]
platform = ststm32
board = nucleo_f767zi
framework = zephyr

lib_deps = https://github.com/eclipse-zenoh/zenoh-pico#release/1.0.0.6

build_flags =
    -DZ_BATCH_UNICAST_SIZE=2048
    -DZ_FRAG_MAX_SIZE=4096

System info

Ubuntu 22.04.4 LTS
Lenovo ThinkPad X13 Gen 4

[jean-roland]

I can't seem to reproduce on my end, could you also share your entire Zephyr config file?