Re: mmu.c:307 BUG with kvm-48

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Andi Kleen wrote:
>>
>> it look like the slab cache is not initlized for some reason,
>> there was fix in kvm-49 that initied the slab cache in another place.
>> (check out commits arround b95061aec006bc4c44e4b244e4ec15c009ab880a)
>>
>> can you please check if it happen in kvm-49 as well?
>>     
>
> I can try it next time and see if it happens again. It is not easily reproducible
> (that would fit the uninitialized memory theory) 
>   

kvm-49 indeed has the fix "uninitialized memory" is perhaps not the most 
accurate description.  Rather, the slab preallocation cache (which kvm 
uses to ensure allocations don't fail) underflowed due to changes in how 
kvm consumes rmap entries; we now refill it at the correct place.

-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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