Vanilla 3.0.78

[Dave Chinner]

On Mon, Jul 29, 2013 at 09:39:37AM +0200, Stefan Priebe - Profihost AG wrote:
> Hi,
> 
> while running 3.0.78 and doing heavy rsync tasks on a raid 50 i'm gettig
> these call traces:

Judging by the timestamps the  problem clears and the system keeps
running?

If so, the problem is likely to be a combination of contention on a
specific AG for allocation and slow IO. Given it is RAID 50, it's
probably really slow IO, and probably lots of threads wanting the
lock and queuing up on it.

What's 'iostat -m -x -d 5' look like when these messages are dumped
out?

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com