[Crash-utility] arm64: Support overflow stack panic

[Hong Yang3 杨红]

Hi Kazu

Here are the latest patches for supporting to run bt command against a core dump with kernel stack overflow exception for arm64.

Please help to review and advise if any further change needed.

Tested bt command with options:

bt
bt -a
bt -c 3

By the way, 'mach' command also updated to show overflow stacks info as same as IRQ stacks.

Thanks
Hong
________________________________
From: HAGIO KAZUHITO(Ècβ¡¡Ò»ÈÊ) <k-hagio-ab at nec.com>
Sent: Wednesday, November 17, 2021 15:23
To: Hong Yang3 Ñîºì <hong.yang3 at nio.com>
Cc: Discussion list for crash utility usage, maintenance and development <crash-utility at redhat.com>
Subject: RE: arm64: Support overflow stack panic

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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 Ñîºì
> 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
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