Re: mm: BUG in unmap_page_range

[Sasha Levin]

On 08/29/2014 09:23 PM, Sasha Levin wrote:
> On 08/27/2014 11:26 AM, Mel Gorman wrote:
>> > diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
>> > index 281870f..ffea570 100644
>> > --- a/include/asm-generic/pgtable.h
>> > +++ b/include/asm-generic/pgtable.h
>> > @@ -723,6 +723,9 @@ static inline pte_t pte_mknuma(pte_t pte)
>> >  
>> >  	VM_BUG_ON(!(val & _PAGE_PRESENT));
>> >  
>> > +	/* debugging only, specific to x86 */
>> > +	VM_BUG_ON(val & _PAGE_PROTNONE);
>> > +
>> >  	val &= ~_PAGE_PRESENT;
>> >  	val |= _PAGE_NUMA;
> Triggered again, the first VM_BUG_ON got hit, the second one never did.

Okay, this bug has reproduced quite a few times since then that I no longer
suspect it's random memory corruption. I'd be happy to try out more debug
patches if you have any leads.


Thanks,
Sasha
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