From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755368Ab2CMOeL (ORCPT ); Tue, 13 Mar 2012 10:34:11 -0400 Received: from e35.co.us.ibm.com ([32.97.110.153]:35852 "EHLO e35.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753025Ab2CMOeI (ORCPT ); Tue, 13 Mar 2012 10:34:08 -0400 Date: Tue, 13 Mar 2012 07:33:31 -0700 From: "Paul E. McKenney" To: Dan Carpenter Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: RCU stalls in linux-next Message-ID: <20120313143327.GA2349@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20120313134822.GA5158@elgon.mountain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120313134822.GA5158@elgon.mountain> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12031314-6148-0000-0000-00000436C21A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 13, 2012 at 04:48:23PM +0300, Dan Carpenter wrote: > I've been getting RCU hangs in linux-next. > > Also sometimes, when I'm building my smatch database after a kernel > compile, my system hangs. I'm not certain if the two things are related. > > regards, > dan carpenter > > Mar 13 14:32:11 elgon kernel: [265405.604199] Pid: 665, comm: kswapd0 Not tainted 3.3.0-rc6-next-20120308+ #141 > Mar 13 14:32:11 elgon kernel: [265405.604200] Call Trace: > Mar 13 14:32:11 elgon kernel: [265405.604201] [] __rcu_pending+0x19a/0x4d0 > Mar 13 14:32:11 elgon kernel: [265405.604208] [] rcu_check_callbacks+0xb0/0x1a0 > Mar 13 14:32:11 elgon kernel: [265405.604210] [] update_process_times+0x43/0x80 > Mar 13 14:32:11 elgon kernel: [265405.604220] [] tick_sched_timer+0x5f/0xb0 > Mar 13 14:32:11 elgon kernel: [265405.604230] [] __run_hrtimer+0x78/0x1d0 > Mar 13 14:32:11 elgon kernel: [265405.604232] [] ? tick_nohz_handler+0xf0/0xf0 > Mar 13 14:32:11 elgon kernel: [265405.604234] [] ? __do_softirq+0xf1/0x210 > Mar 13 14:32:11 elgon kernel: [265405.604235] [] hrtimer_interrupt+0xe3/0x200 > Mar 13 14:32:11 elgon kernel: [265405.604238] [] ? call_softirq+0x1c/0x30 > Mar 13 14:32:11 elgon kernel: [265405.604241] [] smp_apic_timer_interrupt+0x64/0xa0 > Mar 13 14:32:11 elgon kernel: [265405.604243] [] apic_timer_interrupt+0x67/0x70 > Mar 13 14:32:11 elgon kernel: [265405.604244] [] ? zone_watermark_ok_safe+0x8c/0x170 Looks like kswapd is having a bad hair day, CCing linux-mm to see if they can help. Thanx, Paul > Mar 13 14:32:11 elgon kernel: [265405.604248] [] balance_pgdat+0x1a8/0x680 > Mar 13 14:32:11 elgon kernel: [265405.604250] [] kswapd+0x168/0x3f0 > Mar 13 14:32:11 elgon kernel: [265405.604253] [] ? __schedule+0x3a6/0x750 > Mar 13 14:32:11 elgon kernel: [265405.604255] [] ? add_wait_queue+0x60/0x60 > Mar 13 14:32:11 elgon kernel: [265405.604256] [] ? balance_pgdat+0x680/0x680 > Mar 13 14:32:11 elgon kernel: [265405.604258] [] kthread+0x8e/0xa0 > Mar 13 14:32:11 elgon kernel: [265405.604260] [] kernel_thread_helper+0x4/0x10 > Mar 13 14:32:11 elgon kernel: [265405.604262] [] ? kthread_freezable_should_stop+0x70/0x70 > Mar 13 14:32:11 elgon kernel: [265405.604264] [] ? gs_change+0xb/0xb > Mar 13 14:35:11 elgon kernel: [265585.490971] Pid: 665, comm: kswapd0 Not tainted 3.3.0-rc6-next-20120308+ #141 > Mar 13 14:35:11 elgon kernel: [265585.490972] Call Trace: > Mar 13 14:35:11 elgon kernel: [265585.490973] [] __rcu_pending+0x19a/0x4d0 > Mar 13 14:35:11 elgon kernel: [265585.490987] [] rcu_check_callbacks+0xb0/0x1a0 > Mar 13 14:35:11 elgon kernel: [265585.490989] [] update_process_times+0x43/0x80 > Mar 13 14:35:11 elgon kernel: [265585.490991] [] tick_sched_timer+0x5f/0xb0 > Mar 13 14:35:11 elgon kernel: [265585.490994] [] __run_hrtimer+0x78/0x1d0 > Mar 13 14:35:11 elgon kernel: [265585.490995] [] ? tick_nohz_handler+0xf0/0xf0 > Mar 13 14:35:11 elgon kernel: [265585.490997] [] ? __do_softirq+0xf1/0x210 > Mar 13 14:35:11 elgon kernel: [265585.490999] [] hrtimer_interrupt+0xe3/0x200 > Mar 13 14:35:11 elgon kernel: [265585.491002] [] ? call_softirq+0x1c/0x30 > Mar 13 14:35:11 elgon kernel: [265585.491005] [] smp_apic_timer_interrupt+0x64/0xa0 > Mar 13 14:35:11 elgon kernel: [265585.491007] [] apic_timer_interrupt+0x67/0x70 > Mar 13 14:35:11 elgon kernel: [265585.491008] [] ? zone_watermark_ok_safe+0x4d/0x170 > Mar 13 14:35:11 elgon kernel: [265585.491012] [] balance_pgdat+0x1a8/0x680 > Mar 13 14:35:11 elgon kernel: [265585.491014] [] kswapd+0x168/0x3f0 > Mar 13 14:35:11 elgon kernel: [265585.491017] [] ? __schedule+0x3a6/0x750 > Mar 13 14:35:11 elgon kernel: [265585.491019] [] ? add_wait_queue+0x60/0x60 > Mar 13 14:35:11 elgon kernel: [265585.491021] [] ? balance_pgdat+0x680/0x680 > Mar 13 14:35:11 elgon kernel: [265585.491023] [] kthread+0x8e/0xa0 > Mar 13 14:35:11 elgon kernel: [265585.491024] [] kernel_thread_helper+0x4/0x10 > Mar 13 14:35:11 elgon kernel: [265585.491026] [] ? kthread_freezable_should_stop+0x70/0x70 > Mar 13 14:35:11 elgon kernel: [265585.491028] [] ? gs_change+0xb/0xb > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >