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SubjectRe: OOM killer, page fault
On Mon, 2 Nov 2009 13:56:40 +0900
Minchan Kim <minchan.kim@gmail.com> wrote:

> On Mon, 2 Nov 2009 13:24:06 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
>
> > Hi,
> >
> > (Cc to linux-mm)
> >
> > Wow, this is very strange log.
> >
> > > Dear all,
> > >
> > > (please Cc)
> > >
> > > With 2.6.32-rc5 I got that one:
> > > [13832.210068] Xorg invoked oom-killer: gfp_mask=0x0, order=0, oom_adj=0
> >
> > order = 0
>
> I think this problem results from 'gfp_mask = 0x0'.
> Is it possible?
>
> If it isn't H/W problem, Who passes gfp_mask with 0x0?
> It's culpit.
>
> Could you add BUG_ON(gfp_mask == 0x0) in __alloc_pages_nodemask's head?
>

Maybe some code returns VM_FAULT_OOM by mistake and pagefault_oom_killer()
is called. digging mm/memory.c is necessary...

I wonder why...now is this code
===
static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *page_table, pmd_t *pmd,
unsigned int flags, pte_t orig_pte)
{
pgoff_t pgoff;

flags |= FAULT_FLAG_NONLINEAR;

if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
return 0;

if (unlikely(!(vma->vm_flags & VM_NONLINEAR))) {
/*
* Page table corrupted: show pte and kill process.
*/
print_bad_pte(vma, address, orig_pte, NULL);
return VM_FAULT_OOM;
}

pgoff = pte_to_pgoff(orig_pte);
return __do_fault(mm, vma, address, pmd, pgoff, flags, orig_pte);
}
==
Then, OOM...is this really OOM ?

Thanks,
-Kame



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