xfs deadlock in stable kernel 3.0.4

[Christoph Hellwig]

On Sun, Sep 18, 2011 at 11:14:08AM +0200, Stefan Priebe - Profihost AG wrote:
> Hi,
> 
> at least i'm now able to reproduce the issue. I hope this will help
> to investigate the issue and hopefully you can reproduce it as well.
> 
> I'm using vanilla 3.0.4 kernel + xfs as root filesystem and had
> detect hanging taks with 120s set. You'll then see that the bonnie++
> command get's stuck in xlog_grant_log_space while creating or
> deleting files. I was using a SSD or a fast Raid 10 (24x SAS Disks)
> - i was not able to reproduce it on normal SATA disks even a 20x
> SATA Raid 10 didn't work.

Thanks a lot for the reproducer!

I've tried it on my laptop SSD and that didn't reproduce it yet.  I'll
try it on monday on a real high end setup.