[Crash-utility] [PATCH] x86_64: do not process zero size exception stack

[Alexey Makhalov]

> 
> I thought the above because 5.9.4 vmcore on hand doesn't show the 5th address
> and 5.10.0-rc1 one does:
> 
> 5.9.4:
> crash> help -m
> ...
>  [0]: fffffe0000009000 fffffe000000b000 fffffe000000d000 fffffe000000f000
>       0000000000000000 0000000000000000 0000000000000000
> 
> 5.10.0-rc1:
>  [0]: fffffe0000009000 fffffe000000b000 fffffe000000d000 fffffe000000f000
>       fffffe0000012000 0000000000000000 0000000000000000
> 
Thanks for the help. You are right. 5th is VC stack. 5.9.6 kernel I use, is our
Photon OS kernel with backported SEV-ES support. And I was looking on
vanilla sources.

So, I’ll update this patch with proper VC stack handling.

Regards,
—Alexey
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