[Bug 59801] New: kernel BUG at /kernel/fs/ext4/extents.c:1996!

[Bug 59801] New: kernel BUG at /kernel/fs/ext4/extents.c:1996!

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=59801

           Summary: kernel BUG at /kernel/fs/ext4/extents.c:1996!
           Product: File System
           Version: 2.5
    Kernel Version: 3.0.21
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: yang.yulin@zte.com.cn
        Regression: No


Is it data corrupted? this bug make the device reset again and again, if there
is a tool which can repair this error? I tried e2fsck, it didn't work.

Please help, thanks!

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[Bug 59801] kernel BUG at /kernel/fs/ext4/extents.c:1996!

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https://bugzilla.kernel.org/show_bug.cgi?id=59801





--- Comment #1 from yyl810 <yang.yulin@zte.com.cn>  2013-06-17 02:22:55 ---
Created an attachment (id=104911)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=104911)
log

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[Bug 59801] kernel BUG at /kernel/fs/ext4/extents.c:1996!

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=59801


Theodore Tso <tytso@mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tytso@mit.edu




--- Comment #2 from Theodore Tso <tytso@mit.edu>  2013-06-17 03:22:31 ---
What version of e2fsprogs are you using?   The BUG_ON looks like it was
triggered by a zero-length extent, and older versions of e2fsprogs didn't check
for this condition.

I would suggest upgrading to e2fsprogs 1.42.7 (or e2fsprogs 1.42.8, which will
be released in a few days), especially if you are using something older than
1.42.2 or so.

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[Bug 59801] kernel BUG at /kernel/fs/ext4/extents.c:1996!

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=59801





--- Comment #3 from yyl810 <yang.yulin@zte.com.cn>  2013-06-17 05:32:42 ---
Thank you so much.
I was using 1.41.11, do you have e2fsprogs 1.42.7 bin file for ARM? if yes,
could you kindly share with me?

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[Bug 59801] kernel BUG at /kernel/fs/ext4/extents.c:1996!

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https://bugzilla.kernel.org/show_bug.cgi?id=59801


Theodore Tso <tytso@mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #4 from Theodore Tso <tytso@mit.edu>  2013-06-17 12:35:29 ---
Especially with ARM, where in general there is no standardization on C library
shared library bindings, etc., you really need to build user packages for
yourself.    There are more modern (1.42.5) packages for e2fsprogs compiled for
ARM from Debian, but there's no guarantee that it will work on whatever system
you are using.

Please note that support of old kernels, especially kernels as old as 3.0, is
on "best effort" basis.  People who have to use old kernels on a commercial
basis should get help from a commercial support organization (or build up ext4
expertise within their own organization, but the former is generally more
economically effective).   There are a huge number of bug fixes since 3.0, and
while there are a few people will try to backport fixes to the 3.0 kernel, the
testing to make sure those fixes do not introduce new bugs, and the effort to
backport patches if they do not apply cleanly to older kernels, is very much on
a best effort basis.

If the problem is really obvious, as in this case, where I can find the problem
after looking for a few seconds, the open source community can try to give you
support.  But if it requires more work than that, we can't help you --- we just
wouldn't have the time to improve ext4 for the upstream kernel if we were to
supply free support for ancient kernels.  (Not to mention that it would not be
fair for those engineers whose salaries come from getting paid to support
ancient kernels.)

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[Bug 59801] kernel BUG at /kernel/fs/ext4/extents.c:1996!

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https://bugzilla.kernel.org/show_bug.cgi?id=59801


yyl810 <yang.yulin@zte.com.cn> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED




--- Comment #5 from yyl810 <yang.yulin@zte.com.cn>  2013-06-18 01:14:51 ---
I totally understand you and appreciate your suggestion.

Actually yesterday I tried compiling 1.42.7 on my system, although it's
succeeded, but unfortunately there is crash, anyway I found a way to try.

Thanks again.

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