hello world doesn't work on qemu_arc_em when CONFIG_ISR_STACK_SIZE=1048510

[wentongwu]

Describe the bug
hello world sample doesn't work on qemu_arc_em when CONFIG_ISR_STACK_SIZE=1048510

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -DBOARD=qemu_arc_em -DCONFIG_ISR_STACK_SIZE=1048510 ..
3. make run
4. See error

[wentongwu]

The SDK is 0.13.0

[IRISZZW]

@wentongwu I can reproduce it with qemu_arc_em and nsim_em boards.
Then I try to CONFIG_ISR_STACK_SIZE=1048576 (1M), it works fine for both boards. I will continue debug it.
I'm so curios how did you get the magic number 1048510, Could you provide more details?

[IRISZZW]

@wentongwu Could you please provide more details?

[wentongwu]

@wentongwu Could you please provide more details?

someone told me it's just by accidental.

BTW I think this is a high priority bug because it impacts the basic function of Zephyr OS.

[IRISZZW]

@wentongwu usually stack address and stack size need stack alignment, 1048510 is not aligned to 4. so it may cause Misaligned data access exception.

[cfriedt]

Is a 1M stack common for ARC? Typically, we see stack sizes of 1kB, 2kB... even Linux has just started using a stack size of 8kB now for x86_64.

@wentongwu - have you tried a more conventional stack size such as CONFIG_ISR_STACK_SIZE=4096?

[wentongwu]

@cfriedt AFAIK nobody uses so large stack size in real product. But I don't want to talk about why we use so large stack in QEMU. And also Linux...

But the problem here is that the none-4byte-align stack size will cause qemu arc run incorrectly. Not sure if you have tried other size like cmake -DBOARD=qemu_arc_em -DCONFIG_ISR_STACK_SIZE=4094 .. or other platform like mps2_an385, qemu_x86, or zephyr old version(like 2.5).

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