[Crash-utility] arm64: Support overflow stack panic

[HAGIO KAZUHITO(萩尾 一仁)]

Hi Hong,

Thank you for the patch and sending it to this list.

-----Original Message-----
> Hi Crash
> 
> I'll keep refining the patch before it get approved:

OK, so we will wait for the refined patch.

Thanks,
Kazu

> 
> 
> 1.	Fix the error in arm64_overflow_stack_init() which saved the overflow stack address into
> ms->irqstacks[], which would cause bt command crash on other cpus. The normal IRQ stacks should be used
> for bt command for other cpus.
> 2.	In addition to unwind on the overflow stack, try to go through the IRQ stack to find more useful
> information
> 
> Kernel stack overflow case would be rarely but I'd like to sharp the crash to cover this kind of issue.
> 
> Best regards
> Hong
> ________________________________
> 
> From: Hong Yang3 杨红
> Sent: Tuesday, November 16, 2021 9:55
> To: crash-utility at redhat.com <crash-utility at redhat.com>
> Subject: arm64: Support overflow stack panic
> 
> Hi All
> 
> When I was trying to open a core of an overflow stack panic result, the bt command caused a segment fault,
> after a while I figured out the overflow stack is not supported by crash utility.
> 
> This patch is trying to initialize the overflow stack information on startup stage, and the bt command works
> as expected to dump the correct call trace in the overflow stack, currently  it only apply to arm64 target.
> 
> I'm not sure if any other sub command also need to be fixed for full support for the overflow stack, please
> advise and I'll try to improve the patch.
> 
> Thanks
> Hong YANG