On Sat, Oct 22, 2011 at 3:23 PM, Leonidas Spyropoulos
<artafi...@gmail.com> wrote:
> Hello, I got a kernel bug error, my guess from BTRFS.
>
> Here is the report,
> Oct 22 20:44:43 localhost kernel: [25554.947970] BUG: unable to handle
> kernel NULL pointer dereference at 0000000000000030
> Oct 22 20:44:43 localhost kernel: [25554.948002] IP:
> [<ffffffffa01ab027>] btrfs_print_leaf+0x37/0x880 [btrfs]

A patch was submitted by Sergei Trofimovich to address the issue with
handling a NULL pointer in btrfs_print_leaf.

http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg12021.html

Unfortunately, this usually only crops up when btrfs runs into
corruptions that it can't handle.  So you very likely still have
problems even if the btrfs_print_leaf issue isn't addressed.
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