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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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