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SubjectRe: Somebody take a look please! (some kind of kernel bug?)
On Thu, 25 Mar 2010 11:29:25 +0800
Américo Wang <xiyou.wangcong@gmail.com> wrote:

> (Cc'ing linux-mm)
>
Hmm..here is summary of corruption (from log), but no idea.

==
process's address pte pnf->pte->page

00000037b4008000 2bf1e025 -> PG_reserved
00000037b400a000 d900000000 -> bad swap
00000037b400c000 2bfe8025 -> PG_reserved
00000037b400d000 12bfe9025 -> belongs to some other files' page cache
00000037b400e000 ff00000000 -> bad swap
00000037b400f000 5400000000 -> bad swap
...
00000037b4019000 ff00000000 -> bad swap
==
All ptes are on the same pmd 1535b5067.
.
I doubt some kind of buffer overflow bug overwrites page table...
Because ptes for adddress of 00000037b4008000...00000037b400f000 are on head of
a page (used for pmd), some data on page [0x1535b4000..0x1535b5000) caused buffer
overflow and broke page table in [0x1535b5000...0x1535b6000)

Is this bug found from 2.6.28.10 ?

If I investigate this issue, I'll check the owner of page 0x1535b4000 by
crash dump.

Thanks,
-Kame



> 2010/3/25 Janos Haar <janos.haar@netcenter.hu>:
> > Dear developers,
> >
> > This is one of my productive servers, wich suddenly starts to freeze (crash)
> > some weeks before.
> > I have done all what i can, (i think) please somebody give to me some
> > suggestion:
> >
> > Mar 24 19:22:28 alfa kernel: BUG: Bad page map in process httpd pte:2bf1e025
> > pmd:1535b5067
> > Mar 24 19:22:28 alfa kernel: page:ffffea0000f1b250 flags:4000000000000404
> > count:1 mapcount:-1 mapping:(null) index:0
> > Mar 24 19:22:28 alfa kernel: addr:00000037b4008000 vm_flags:08000875
> > anon_vma:(null) mapping:ffff88022b5d25a8 index:8
> > Mar 24 19:22:28 alfa kernel: vma->vm_ops->fault: filemap_fault+0x0/0x34d
> > Mar 24 19:22:28 alfa kernel: vma->vm_file->f_op->mmap:
> > xfs_file_mmap+0x0/0x33
> > Mar 24 19:22:28 alfa kernel: Pid: 7512, comm: httpd Not tainted 2.6.32.10 #2
> > Mar 24 19:22:28 alfa kernel: Call Trace:
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c2ea3>] print_bad_pte+0x210/0x229
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c3c98>] unmap_vmas+0x44b/0x787
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c81d5>] exit_mmap+0xb0/0x133
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81041f83>] mmput+0x48/0xb9
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810463b0>] exit_mm+0x105/0x110
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81371287>] ?
> > tty_audit_exit+0x28/0x85
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810477a0>] do_exit+0x1e9/0x6d2
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81053c37>] ?
> > __dequeue_signal+0xf1/0x127
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81047d00>] do_group_exit+0x77/0xa1
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810560f7>]
> > get_signal_to_deliver+0x32c/0x37f
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff8100a484>]
> > do_notify_resume+0x90/0x740
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff8102724b>] ?
> > __bad_area_nosemaphore+0x178/0x1a2
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810272b9>] ? __bad_area+0x44/0x4d
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff8100bba2>] retint_signal+0x46/0x84
> > Mar 24 19:22:28 alfa kernel: Disabling lock debugging due to kernel taint
> > Mar 24 19:22:28 alfa kernel: swap_free: Bad swap file entry 6c800000
> > Mar 24 19:22:28 alfa kernel: BUG: Bad page map in process httpd
> > pte:d900000000 pmd:1535b5067
> > Mar 24 19:22:28 alfa kernel: addr:00000037b400a000 vm_flags:08000875
> > anon_vma:(null) mapping:ffff88022b5d25a8 index:a
> > Mar 24 19:22:28 alfa kernel: vma->vm_ops->fault: filemap_fault+0x0/0x34d
> > Mar 24 19:22:28 alfa kernel: vma->vm_file->f_op->mmap:
> > xfs_file_mmap+0x0/0x33
> > Mar 24 19:22:28 alfa kernel: Pid: 7512, comm: httpd Tainted: G    B
> > 2.6.32.10 #2
> > Mar 24 19:22:28 alfa kernel: Call Trace:
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81044551>] ? add_taint+0x32/0x3e
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c2ea3>] print_bad_pte+0x210/0x229
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c3d47>] unmap_vmas+0x4fa/0x787
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c81d5>] exit_mmap+0xb0/0x133
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81041f83>] mmput+0x48/0xb9
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810463b0>] exit_mm+0x105/0x110
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81371287>] ?
> > tty_audit_exit+0x28/0x85
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810477a0>] do_exit+0x1e9/0x6d2
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81053c37>] ?
> > __dequeue_signal+0xf1/0x127
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81047d00>] do_group_exit+0x77/0xa1
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810560f7>]
> > get_signal_to_deliver+0x32c/0x37f
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff8100a484>]
> > do_notify_resume+0x90/0x740
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff8102724b>] ?
> > __bad_area_nosemaphore+0x178/0x1a2
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810272b9>] ? __bad_area+0x44/0x4d
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff8100bba2>] retint_signal+0x46/0x84
> > Mar 24 19:22:28 alfa kernel: BUG: Bad page map in process httpd pte:2bfe8025
> > pmd:1535b5067
> > Mar 24 19:22:28 alfa kernel: page:ffffea0000f1f7c0 flags:4000000000000404
> > count:1 mapcount:-1 mapping:(null) index:0
> > Mar 24 19:22:28 alfa kernel: addr:00000037b400c000 vm_flags:08000875
> > anon_vma:(null) mapping:ffff88022b5d25a8 index:c
> > Mar 24 19:22:28 alfa kernel: vma->vm_ops->fault: filemap_fault+0x0/0x34d
> > Mar 24 19:22:28 alfa kernel: vma->vm_file->f_op->mmap:
> > xfs_file_mmap+0x0/0x33
> > Mar 24 19:22:28 alfa kernel: Pid: 7512, comm: httpd Tainted: G    B
> > 2.6.32.10 #2
> > Mar 24 19:22:28 alfa kernel: Call Trace:
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81044551>] ? add_taint+0x32/0x3e
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c2ea3>] print_bad_pte+0x210/0x229
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c3c98>] unmap_vmas+0x44b/0x787
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810c81d5>] exit_mmap+0xb0/0x133
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff81041f83>] mmput+0x48/0xb9
> > Mar 24 19:22:28 alfa kernel:  [<ffffffff810463b0>] exit_mm+0x105/0x110
> > .....
> >
> > The entire log is here:
> > http://download.netcenter.hu/bughunt/20100324/messages
> >
> > The actual kernel is 2.6.32.10, but the crash-series started @ 2.6.28.10.
> >
> > I have forwarded the tasks to another server, removed this from the room,
> > and the hw survived memtest86 in >7 days continously + i have tested the
> > HDDs one by one with badblocks -vvw, all is good.
> > For me looks like this is not a hw problem.
> >
> > Somebody have any idea?
> >
> > Thanks a lot,
> > Janos Haar
> > --
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