New: Ext4 NULL pointer reference in mb_cache function

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: [email protected]
ReportedBy: [email protected]
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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