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SubjectRe: OOM killer, page fault
On Mon, 2 Nov 2009 14:02:16 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> 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 ?

It seems that the goal is to kill process by OOM trick as comment said.

I found It results from Hugh's commit 65500d234e74fc4e8f18e1a429bc24e51e75de4a.
I think it's not a real OOM.

BTW, If it is culpit in this case, print_bad_pte should have remained any log. :)

>
> Thanks,
> -Kame
>


--
Kind regards,
Minchan Kim


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