linux-kernel - RCU stalls in linux-next

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Date:	Tue, 13 Mar 2012 16:48:23 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org
Subject: RCU stalls in linux-next

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]  <IRQ>  [<ffffffff810ab9da>] __rcu_pending+0x19a/0x4d0
Mar 13 14:32:11 elgon kernel: [265405.604208]  [<ffffffff810ac1d0>] rcu_check_callbacks+0xb0/0x1a0
Mar 13 14:32:11 elgon kernel: [265405.604210]  [<ffffffff81044293>] update_process_times+0x43/0x80
Mar 13 14:32:11 elgon kernel: [265405.604220]  [<ffffffff8107eb0f>] tick_sched_timer+0x5f/0xb0
Mar 13 14:32:11 elgon kernel: [265405.604230]  [<ffffffff81058f68>] __run_hrtimer+0x78/0x1d0
Mar 13 14:32:11 elgon kernel: [265405.604232]  [<ffffffff8107eab0>] ? tick_nohz_handler+0xf0/0xf0
Mar 13 14:32:11 elgon kernel: [265405.604234]  [<ffffffff8103ba91>] ? __do_softirq+0xf1/0x210
Mar 13 14:32:11 elgon kernel: [265405.604235]  [<ffffffff81059843>] hrtimer_interrupt+0xe3/0x200
Mar 13 14:32:11 elgon kernel: [265405.604238]  [<ffffffff8170c74c>] ? call_softirq+0x1c/0x30
Mar 13 14:32:11 elgon kernel: [265405.604241]  [<ffffffff8101f7c4>] smp_apic_timer_interrupt+0x64/0xa0
Mar 13 14:32:11 elgon kernel: [265405.604243]  [<ffffffff8170be07>] apic_timer_interrupt+0x67/0x70
Mar 13 14:32:11 elgon kernel: [265405.604244]  <EOI>  [<ffffffff810d87ac>] ? zone_watermark_ok_safe+0x8c/0x170
Mar 13 14:32:11 elgon kernel: [265405.604248]  [<ffffffff810e73c8>] balance_pgdat+0x1a8/0x680
Mar 13 14:32:11 elgon kernel: [265405.604250]  [<ffffffff810e7a08>] kswapd+0x168/0x3f0
Mar 13 14:32:11 elgon kernel: [265405.604253]  [<ffffffff81702916>] ? __schedule+0x3a6/0x750
Mar 13 14:32:11 elgon kernel: [265405.604255]  [<ffffffff810556b0>] ? add_wait_queue+0x60/0x60
Mar 13 14:32:11 elgon kernel: [265405.604256]  [<ffffffff810e78a0>] ? balance_pgdat+0x680/0x680
Mar 13 14:32:11 elgon kernel: [265405.604258]  [<ffffffff81054c7e>] kthread+0x8e/0xa0
Mar 13 14:32:11 elgon kernel: [265405.604260]  [<ffffffff8170c654>] kernel_thread_helper+0x4/0x10
Mar 13 14:32:11 elgon kernel: [265405.604262]  [<ffffffff81054bf0>] ? kthread_freezable_should_stop+0x70/0x70
Mar 13 14:32:11 elgon kernel: [265405.604264]  [<ffffffff8170c650>] ? 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]  <IRQ>  [<ffffffff810ab9da>] __rcu_pending+0x19a/0x4d0
Mar 13 14:35:11 elgon kernel: [265585.490987]  [<ffffffff810ac1d0>] rcu_check_callbacks+0xb0/0x1a0
Mar 13 14:35:11 elgon kernel: [265585.490989]  [<ffffffff81044293>] update_process_times+0x43/0x80
Mar 13 14:35:11 elgon kernel: [265585.490991]  [<ffffffff8107eb0f>] tick_sched_timer+0x5f/0xb0
Mar 13 14:35:11 elgon kernel: [265585.490994]  [<ffffffff81058f68>] __run_hrtimer+0x78/0x1d0
Mar 13 14:35:11 elgon kernel: [265585.490995]  [<ffffffff8107eab0>] ? tick_nohz_handler+0xf0/0xf0
Mar 13 14:35:11 elgon kernel: [265585.490997]  [<ffffffff8103ba91>] ? __do_softirq+0xf1/0x210
Mar 13 14:35:11 elgon kernel: [265585.490999]  [<ffffffff81059843>] hrtimer_interrupt+0xe3/0x200
Mar 13 14:35:11 elgon kernel: [265585.491002]  [<ffffffff8170c74c>] ? call_softirq+0x1c/0x30
Mar 13 14:35:11 elgon kernel: [265585.491005]  [<ffffffff8101f7c4>] smp_apic_timer_interrupt+0x64/0xa0
Mar 13 14:35:11 elgon kernel: [265585.491007]  [<ffffffff8170be07>] apic_timer_interrupt+0x67/0x70
Mar 13 14:35:11 elgon kernel: [265585.491008]  <EOI>  [<ffffffff810d876d>] ? zone_watermark_ok_safe+0x4d/0x170
Mar 13 14:35:11 elgon kernel: [265585.491012]  [<ffffffff810e73c8>] balance_pgdat+0x1a8/0x680
Mar 13 14:35:11 elgon kernel: [265585.491014]  [<ffffffff810e7a08>] kswapd+0x168/0x3f0
Mar 13 14:35:11 elgon kernel: [265585.491017]  [<ffffffff81702916>] ? __schedule+0x3a6/0x750
Mar 13 14:35:11 elgon kernel: [265585.491019]  [<ffffffff810556b0>] ? add_wait_queue+0x60/0x60
Mar 13 14:35:11 elgon kernel: [265585.491021]  [<ffffffff810e78a0>] ? balance_pgdat+0x680/0x680
Mar 13 14:35:11 elgon kernel: [265585.491023]  [<ffffffff81054c7e>] kthread+0x8e/0xa0
Mar 13 14:35:11 elgon kernel: [265585.491024]  [<ffffffff8170c654>] kernel_thread_helper+0x4/0x10
Mar 13 14:35:11 elgon kernel: [265585.491026]  [<ffffffff81054bf0>] ? kthread_freezable_should_stop+0x70/0x70
Mar 13 14:35:11 elgon kernel: [265585.491028]  [<ffffffff8170c650>] ? gs_change+0xb/0xb
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