[Bug 14094] New: Ext4 NULL pointer reference in mb_cache function

[bugzilla-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=14094

           Summary: Ext4 NULL pointer reference in mb_cache function
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.31-rc8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: suokkos@gmail.com
        Regression: No


Created an attachment (id=22922)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=22922)
lspci for hardware details.

How bug was caused?

I did run apt-get upgrade in background while starting up firefox and pidgin.
Now there went something wrong in ext4. So I don't know exactly how to
reproduce this.

Reproducing?

Only once just a few minutes ago.

Version where this was seen?

Vanilla kernel v2.6.31-rc7 just a commit before tagging rc8 with a via agp
driver bug patch.

User land is Ubuntu Karmic.

Disk file system was upgraded from ext3 partition.

Debug info?

Sorry. all was lost because file system crashed so I could write it locally or
upload anywhere. I did try to upload it using ssh but that killed my last
working console so I have to do forced shutdown.

So all you have now left is my bad memory that remembers back trace in ext4
mb_*cache*. Which then caused a lot of warnings about scheduling while atomic.

If I can reproduce this I will next time take a photo before trying anything
else.

I'm just about to upgrade to the latest code even tough list of changes don't
look like affecting this.

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