linux-kernel - Re: NULL pointer dereference in ext4_superblock_csum

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Date:	Wed, 13 Mar 2013 12:10:16 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andreas Dilger <adilger.kernel@...ger.ca>
Subject: Re: NULL pointer dereference in ext4_superblock_csum_set with
 mounted filesystem

On Wed, Mar 13, 2013 at 03:01:41PM -0400, Theodore Ts'o wrote:
> On Wed, Mar 13, 2013 at 11:59:13AM -0700, Josh Triplett wrote:
> > I frequently test kernel changes by booting them with kvm's -kernel
> > option, with -hda pointing to my host system's root filesystem, and
> > -snapshot to prevent writing to (and likely corrupting) that root
> > filesystem.  I tried this with a kernel built from git commit
> > 7c6baa304b841673d3a55ea4fcf9a5cbf7a1674b, with a stock x86-64 "make
> > defconfig", and got a kernel panic:
> 
> Can you send me the output of "dumpe2fs -h" on your host system's root
> file system?

Attached.

- Josh Triplett

View attachment "dumpe2fs.log" of type "text/plain" (1998 bytes)