linux-ext4 - Re: [Bug 42859] New: kernel BUG at fs/ext4/extents.c:1953

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Message-ID: <4F53E874.5050201@web.de>
Date:	Sun, 04 Mar 2012 23:11:00 +0100
From:	Matthias Erll <merll@....de>
To:	Ted Ts'o <tytso@....edu>
CC:	linux-ext4@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org
Subject: Re: [Bug 42859] New: kernel BUG at fs/ext4/extents.c:1953

Hi Ted,

Am 04.03.12 21:27, schrieb Ted Ts'o:
> On Sun, Mar 04, 2012 at 02:39:09PM +0000, bugzilla-daemon@...zilla.kernel.org wrote:
>> Messages "kernel BUG at fs/ext4/extents.c:1953" occur, which seem to be
>> triggered when running certain processes (reproducible with init and gdm). The
>> volume can be mounted without any apparent problems and e2fsck does not report
>> any errors. Nevertheless, the file system may have been corrupted during an
>> earlier system crash.
> Would you be willing to apply the following patch, and then see which
> inode number gets reported (and whether it is always the same inode
> number or one that varies) and then report back the results of running
> the following debugfs commands?
>
> (assuming the inode number is 12345)
>
> debugfs /dev/sdX
>
> debugfs: stat <12345>
> degbufs: ex <12345>

In the three cases I can reproduce, the inode number has been identical.
Please find the debugfs output below.

Kind regards,
Matthias




debugfs /dev/sda2
debugfs 1.42.1 (17-Feb-2012)

debugfs: stat <1312385>
Inode: 1312385   Type: regular    Mode:  0664   Flags: 0x80000
Generation: 1339335381    Version: 0x00000000:00000001
User:     0   Group:   406   Size: 0
File ACL: 0    Directory ACL: 0
Links: 1   Blockcount: 0
Fragment:  Address: 0    Number: 0    Size: 0
 ctime: 0x4f53e0ab:3c51ed20 -- Sun Mar  4 22:37:47 2012
 atime: 0x4eda803c:da6fb35c -- Sat Dec  3 21:02:04 2011
 mtime: 0x4f53e0ab:3bd7da30 -- Sun Mar  4 22:37:47 2012
crtime: 0x4eda803c:da6fb35c -- Sat Dec  3 21:02:04 2011
Size of extra inode fields: 28
EXTENTS:

debugfs: ex <1312385>
Level Entries       Logical          Physical Length Flags
 0/ 0   1/  1     0 - 4294967295 5276276 - 4300243571      0


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