Re: frequent lockups in 3.18rc4

[Dave Jones]

On Mon, Dec 01, 2014 at 06:08:38PM -0500, Chris Mason wrote:
 > I'm not sure if this is related, but running trinity here, I noticed it
 > was stuck at 100% system time on every CPU.  perf report tells me we are
 > spending all of our time in spin_lock under the sync system call.
 > 
 > I think it's coming from contention in the bdi_queue_work() call from
 > inside sync_inodes_sb, which is spin_lock_bh(). 
 > 
 > I wonder if we're just spinning so hard on this one bh lock that we're
 > starving the watchdog?
 > 
 > Dave, do you have spinlock debugging on?  

That has been a constant, yes. I can try with that disabled some time.

	Dave

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