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SubjectRe: RCU stalls in linux-next
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] <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

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] [<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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