From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: CAI Qian <caiqian@redhat.com>, linux-mm <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: kswapd hung tasks in 2.6.38-rc1
Date: Mon, 31 Jan 2011 15:20:03 -0800 [thread overview]
Message-ID: <1296516003.7797.5061.camel@nimitz> (raw)
In-Reply-To: <20110131231301.GP16981@random.random>
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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next prev parent reply other threads:[~2011-01-31 23:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2056664954.83361.1295513496286.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2011-01-20 8:55 ` kswapd hung tasks in 2.6.38-rc1 CAI Qian
2011-01-31 20:58 ` Dave Hansen
2011-01-31 22:40 ` Dave Hansen
2011-01-31 23:13 ` Andrea Arcangeli
2011-01-31 23:20 ` Dave Hansen [this message]
2011-02-01 1:43 ` Dave Hansen
2011-02-01 17:17 ` Dave Hansen
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