[Bug 71301] New: CPU soft lockup

[Bug 71301] New: CPU soft lockup

[bugzilla-daemon]

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

            Bug ID: 71301
           Summary: CPU soft lockup
           Product: File System
           Version: 2.5
    Kernel Version: 3.13.5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@kernel-bugs.osdl.org
          Reporter: cyril.adrian@gmail.com
        Regression: No

Created attachment 127701
  --> https://bugzilla.kernel.org/attachment.cgi?id=127701&action=edit
.config and syslog

During a simple and innocent "du" :-)

The process locked in the kernel, I could not kill it, machine froze at
shutdown (I had to turn it off the hard way).

I join the syslog (only starting from the first bug).

Home-compiled kernel, .config joined too.

For more info please ask.

Best regards,

Cyril

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[Bug 71301] CPU soft lockup

[bugzilla-daemon]

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

Theodore Tso <tytso@mit.edu> changed:

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

--- Comment #1 from Theodore Tso <tytso@mit.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\x17
,\rE\x19): 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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[Bug 71301] CPU soft lockup

[bugzilla-daemon]

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

--- Comment #2 from Cyril Adrian <cyril.adrian@gmail.com> ---
Nothing reliable, but a lot of memory retention (3.13 succeeds to fill up my
16Gb RAM, e.g. when I do a remote backup using rsync; something never seen
before) -- maybe worsened by suspend, but I'm not sure about anything.

Anyway it seems related to 3.13 because I never had any problem with 3.12.

How can I investigate?

Thanks,

Cyril

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[Bug 71301] CPU soft lockup

[bugzilla-daemon]

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

Cyril Adrian <cyril.adrian@gmail.com> changed:

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

--- Comment #3 from Cyril Adrian <cyril.adrian@gmail.com> ---
OK, memtest86+ found the problem: faulty RAM. Bug fixed :-)

Best regards,

Cyril

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