[Bug 15543] New: Oops in dentry_iput during ext3 remount readonly

[Bug 15543] New: Oops in dentry_iput during ext3 remount readonly

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15543

               URL: http://i.imgur.com/27p2f.jpg
           Summary: Oops in dentry_iput during ext3 remount readonly
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.32-gentoo-r5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: ext3
        AssignedTo: fs_ext3@kernel-bugs.osdl.org
        ReportedBy: ironiridis@gmail.com
        Regression: No


Was rebooting an office machine after a few package upgrades, and right at the
tail end of the reboot it appears that the kernel Oopsed right at the remount,
just before reboot.

I can attach my config and the kernel patchset provided with my distro, just
ask.

Below is my retyped Oops printout (photo of monitor is URL of bug):

EIP is at dentry_iput+0x25/0xb0
EAX: f057983c EBX: f05797f8 ECX: f05cad1c EDX: b05cad1c
ESI: f05cad04 EDI: f0579824 EBP: f05797f8 ESP: f69a8ef4
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process umount (pid: 6490, ti=f69a8000 task=f72cc6e0 task.ti=f69a8000)
Stack:
 00000282 f0579770 f05787f8 f05797f8 f69a8f2c c10940c2 f6897a00 f69a8f2c
<0> c10942fd f69a8f34 00000000 f6897a84 00000000 00000000 eafac2d4 f05798ac
<0> f69a8f34 f69a8f34 f6897a00 00000000 00000000 f69a8000 c1086775 00000001
Call Trace:
 [<c10940c2>] ? d_kill+0x32/0x60
 [<c10942fd>] ? __shrink_dcache_sb+0x20d/0x290
 [<c1086775>] ? do_remount_sb+0x35/0xe0
 [<c1099fa1>] ? sys_umount+0x321/0x350
 [<c106ef77>] ? remove_vma+0x37/0x50
 [<c1070502>] ? do_munmap+0x212/0x270
 [<c1099fe7>] ? sys_oldumount+0x17/0x20
 [<c1002e08>] ? sysenter_do_call+0x12/0x26
Code: 0f 0b eb fe 66 90 56 53 89 c3 83 ec 0c 8b 70 10 85 f6 0f 84 8e 00 00 00
c7
 40 10 00 00 00 00 8d 40 44 8b 4b 44 8b 53 48 89 51 04 <89> 0a 89 43 44 89 43
48
 fe 43 08 fe 05 c0 63 3f c1 8b 46 28 85
EIP: [<c1093f85>] dentry_iput+0x25/0xb0 SS:ESP 0068:f69a8ef4
CR2: 00000000b05cad1c
---[ end trace 29d86a99dda601c9 ]---

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[Bug 15543] Oops in dentry_iput during ext3 remount readonly

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15543





--- Comment #1 from Chris Harrington <ironiridis@gmail.com>  2010-03-15 20:58:09 ---
Oh, it might be helpful to add that this is a pure 64-bit machine.

chris@chariot ~ $ uname -a
Linux chariot 2.6.32-gentoo-r5 #2 SMP Mon Feb 15 12:51:56 CST 2010 i686
Intel(R) Core(TM)2 Duo CPU E8200 @ 2.66GHz GenuineIntel GNU/Linux

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[Bug 15543] Oops in dentry_iput during ext3 remount readonly

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15543





--- Comment #2 from Chris Harrington <ironiridis@gmail.com>  2010-03-16 15:20:54 ---
(In reply to comment #1)
> Oh, it might be helpful to add that this is a pure 64-bit machine.

More bugspam. I meant "this is *not* a pure 64-bit machine" but of course I
can't get my booleans straight.

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[Bug 15543] Oops in dentry_iput during ext3 remount readonly

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15543


Jan Kara <jack@suse.cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jack@suse.cz
         AssignedTo|fs_ext3@kernel-bugs.osdl.or |jack@suse.cz
                   |g                           |




--- Comment #3 from Jan Kara <jack@suse.cz>  2010-03-17 12:15:19 ---
Thanks for the report. I'm sorry but this looks like a single-bit error. From
the oops, it looks like the kernel tried to dereference address 0xb05cad1c
while the correct address would be f05cad1c (as you can see, lots of addresses
in this range are in registers so that's probably where kernel has it's data on
your machine). So I'd blame either cosmic rays or faulty HW. Maybe try running
memtest, or try replacing memory if it repeats. I'll close the bug as
invalid...

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