Subject: Re: next-20090206: deadlock on ext4

From: Eric Sandeen <[email-masked]>
Date: Fri, 06 Feb 2009 11:42:09 -0600

Alexander Beregalov wrote:
> Hi
> 
> I run dbench on ext4 on loop device.
> 
> EXT4-fs: barriers enabled
> kjournald2 starting: pid 2420, dev loop0:8, commit interval 5 seconds
> EXT4 FS on loop0, internal journal on loop0:8
> EXT4-fs: delayed allocation enabled
> EXT4-fs: file extents enabled
> EXT4-fs: mballoc enabled
> EXT4-fs: mounted filesystem loop0 with ordered data mode
> JBD: barrier-based sync failed on loop0:8 - disabling barriers
> 
> INFO: task pdflush:2339 blocked for more than 120 seconds.

Looks a lot like a bug I filed:

http://bugzilla.kernel.org/show_bug.cgi?id=12579

but I'm having trouble reproducing it, now.  I'll try dbench!

-Eric