Re: [dm-devel] kernel NULL pointer after snapshot remove on 2.6.17

[Milan Broz <mbroz redhat com>]

This is known bug, patch already in -mm tree.

For patch see http://bugzilla.kernel.org/show_bug.cgi?id=7040

Milan
--
mbroz redhat com

Brice Figureau wrote:
> Hi,
>
> I just found the following oops after lvremove'ing a snapshot which was
> used to backup a mysql database.
>
> This oops happened because I mistakenly copied a part of the snapshot
> back to the original volume. This apparently exhausted the capacity of
> the snapshot and triggered the following oops.
>
> lvremove after the oops was stuck in D+ state. 
> Any lv* command was also stuck after that.
> After that the server was stuck while rebooting with the error message:
> "snapshot is marked invalid", then nothing else.
>
> I cured the problem by booting a rescue CD, and hand-lvremoving the
> offending snapshot.
>
> All this is on an amd64 debian etch with custom compiled kernel version
> 2.6.17, and lvm2 version 2.02.06-2, and libdevmapper is at 1.02.08-1.