Re: Panic in reserve_memtype()

[Pallipadi, Venkatesh]

On Wed, 2010-02-24 at 12:22 -0800, Jack Steiner wrote:
> We see an X86_64 regression that started a few days ago. The kernel is booted
> via EFI & panics in the pat.c code trying to deref a NULL pointer.
> 
> I didn't debug the problem but am suspicious of
> 	x86, pat: Migrate to rbtree only backend for pat memtype management  x86/pat
> 		author	Pallipadi, Venkatesh <venkatesh.pallipadi@xxxxxxxxx>	
> 		Wed, 10 Feb 2010 23:26:07 +0000 (15:26 -0800)
> 	committer	H. Peter Anvin <hpa@xxxxxxxxx>	
> 		Thu, 18 Feb 2010 23:41:36 +0000 (15:41 -0800)
> 
> 
> 
> Has anyone seen this? If not, I can debug further....
> 


Haven't seen this on my test systems here, but I haven't tested with EFI
boot either.

I assume this is repeatable, and you always see this panic. I am looking
at the code right now. Can you rollback this particular patch and see
whether it goes away?

Thanks,
Venki

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