Memory alignment issue. mutex has to ablligned?

[shlomots]

I have a class that wraps the Zephyr implementation of a mutex. For some reason, when the code runs, I get this error:

ASSERTION FAIL [mutex->lock_count > 0U] @ WEST_TOPDIR/zephyr/kernel/mutex.c:239

If I add __align(8) to the wrapper class, the problem is fixed and the code runs perfectly.
Does Zephyr's mutex implementation have to be aligned?

Thanks in advance, 
Shlomo

[Einar Thorsrud]

Hi Shlomo,

I do not see an immediate reason why you would ge tth eassert on line 249 in mutex.c due to alignment issues. I suspect that the root cause is something else, perhaps a memory corruption issue of some sort caused the mutex to be overwritten so that the lock count was set to 0 when it should not? Do you see more in the log? And can  you share more details about your project where you reproduce this?

Br,

Einar