linux-ext4 - [Bug 71301] CPU soft lockup

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Message-ID: <bug-71301-13602-TULW35sHUp@https.bugzilla.kernel.org/>
Date:	Fri, 28 Feb 2014 20:42:44 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 71301] CPU soft lockup

https://bugzilla.kernel.org/show_bug.cgi?id=71301

Theodore Tso <tytso@....edu> changed:

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

--- Comment #1 from Theodore Tso <tytso@....edu> ---
It looks like a wild pointer which corrupted kernel memory.  This can be seen
in the device name being garbage in the ext4_error message:

Feb 26 20:11:18 didactylos kernel: [24848.293159] EXT4-fs error (device >fA.
,\rE.): ext4_map_blocks:582: inode #64881109: block 259531249: comm du: lblock
0 mapped to illegal pblock (length 1)

Also, the BUG_ON in the timer.c:732 is caused by the timer function
sb->s_err_report.function being zero.  But this is initialized when the file
system is mounted, and it's never changed by the ext4 code.

So the bug looks like it could be anywhere in the kernel, and it was just that
the memory that the wild pointer corruption happened to corrupt this time
around was in ext4's data structure.

Are you seeing any other problems with your kernel?  Can you reliably reproduce
any of them?

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