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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>