linux-kernel - Re: kswapd hung tasks in 2.6.38-rc1

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Message-ID: <1296516003.7797.5061.camel@nimitz>
Date:	Mon, 31 Jan 2011 15:20:03 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	CAI Qian <caiqian@...hat.com>, linux-mm <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org
Subject: Re: kswapd hung tasks in 2.6.38-rc1

On Tue, 2011-02-01 at 00:13 +0100, Andrea Arcangeli wrote:
> On Mon, Jan 31, 2011 at 02:40:16PM -0800, Dave Hansen wrote:
> > Still not a very good data point, but I ran a heavy swap load for an
> > hour or so without reproducing this.  But, it happened again after I
> > enabled transparent huge pages.  I managed to get a sysrq-t dump out of
> > it:
> > 
> > 	http://sr71.net/~dave/ibm/2.6.38-rc2-hang-0.txt
> > 
> > khugepaged is one of the three running tasks.  Note, I set both its
> > sleep timeouts to zero to stress it out a bit.
> 
> sysrq+l? sysrq+t doesn't provide interesting info for running tasks.

I'll try to get a sysrq-l dump.

> > I'll keep trying to reproduce without THP.
> 
> BTW, do you have prove locking enabled? With recent git I get a
> deadlock inside _raw_spin_unlock_irq with prove locking enabled and it
> goes away when I disable it.

Nope:

$ grep PROVE ../mhp-build/x86_64-elm3b82/.config
# CONFIG_PROVE_LOCKING is not set

Full .config is here

	http://sr71.net/~dave/ibm/config-v2.6.38-rc2

-- Dave

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