linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141202193252.GB17595@redhat.com>
Date:	Tue, 2 Dec 2014 14:32:52 -0500
From:	Dave Jones <davej@...hat.com>
To:	Chris Mason <clm@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

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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