Re: RCU stalls in linux-next

[Dan Carpenter]

I get these on my netbook as well if I run it for long enough.  I
just read email on that and do the occasional git pull.

regards,
dan carpenter

[ 3906.306118] eth0: no IPv6 routers present
[58395.111474] apt-get used greatest stack depth: 4032 bytes left
[231179.224907] apt-get used greatest stack depth: 3632 bytes left
[491541.321011] INFO: rcu_sched self-detected stall on CPU { 0}  (t=60000 jiffies)
[491541.321011] Pid: 576, comm: kswapd0 Not tainted 3.3.0-rc4-next-20120222+ #129
[491541.321011] Call Trace:
[491541.321011]  <IRQ>  [<ffffffff810ab6ea>] __rcu_pending+0x19a/0x4d0
[491541.321011]  [<ffffffff8106b1dc>] ? trigger_load_balance+0x5c/0x2e0
[491541.321011]  [<ffffffff810abd50>] rcu_check_callbacks+0xb0/0x1a0
[491541.321011]  [<ffffffff81043f73>] update_process_times+0x43/0x80
[491541.321011]  [<ffffffff8107e8cf>] tick_sched_timer+0x5f/0xb0
[491541.321011]  [<ffffffff81058c58>] __run_hrtimer+0x78/0x1d0
[491541.321011]  [<ffffffff8107e870>] ? tick_nohz_handler+0xf0/0xf0
[491541.321011]  [<ffffffff8103baa1>] ? __do_softirq+0xf1/0x210
[491541.321011]  [<ffffffff81059583>] hrtimer_interrupt+0xe3/0x200
[491541.321011]  [<ffffffff8170880c>] ? call_softirq+0x1c/0x30
[491541.321011]  [<ffffffff8101f564>] smp_apic_timer_interrupt+0x64/0xa0
[491541.321011]  [<ffffffff81707ecb>] apic_timer_interrupt+0x6b/0x70
[491541.321011]  <EOI>  [<ffffffff810d8203>] ? zone_watermark_ok_safe+0xe3/0x170
[491541.321011]  [<ffffffff810e6de8>] balance_pgdat+0x1a8/0x690
[491541.321011]  [<ffffffff810e7438>] kswapd+0x168/0x3f0
[491541.321011]  [<ffffffff816fea26>] ? __schedule+0x3a6/0x750
[491541.321011]  [<ffffffff810553a0>] ? add_wait_queue+0x60/0x60
[491541.321011]  [<ffffffff810e72d0>] ? balance_pgdat+0x690/0x690
[491541.321011]  [<ffffffff8105496e>] kthread+0x8e/0xa0
[491541.321011]  [<ffffffff81708714>] kernel_thread_helper+0x4/0x10
[491541.321011]  [<ffffffff810548e0>] ? kthread_freezable_should_stop+0x70/0x70
[491541.321011]  [<ffffffff81708710>] ? gs_change+0xb/0xb
[491721.324004] INFO: rcu_sched self-detected stall on CPU { 0}  (t=240003 jiffies)
[491721.324004] Pid: 576, comm: kswapd0 Not tainted 3.3.0-rc4-next-20120222+ #129
[491721.324004] Call Trace:
[491721.324004]  <IRQ>  [<ffffffff810ab6ea>] __rcu_pending+0x19a/0x4d0
[491721.324004]  [<ffffffff8106b1dc>] ? trigger_load_balance+0x5c/0x2e0
[491721.324004]  [<ffffffff810abd50>] rcu_check_callbacks+0xb0/0x1a0
[491721.324004]  [<ffffffff81043f73>] update_process_times+0x43/0x80
[491721.324004]  [<ffffffff8107e8cf>] tick_sched_timer+0x5f/0xb0
[491721.324004]  [<ffffffff81058c58>] __run_hrtimer+0x78/0x1d0
[491721.324004]  [<ffffffff8107e870>] ? tick_nohz_handler+0xf0/0xf0
[491721.324004]  [<ffffffff8103baa1>] ? __do_softirq+0xf1/0x210
[491721.324004]  [<ffffffff81059583>] hrtimer_interrupt+0xe3/0x200
[491721.324004]  [<ffffffff8170880c>] ? call_softirq+0x1c/0x30
[491721.324004]  [<ffffffff8101f564>] smp_apic_timer_interrupt+0x64/0xa0
[491721.324004]  [<ffffffff81707ecb>] apic_timer_interrupt+0x6b/0x70
[491721.324004]  <EOI>  [<ffffffff810d812d>] ? zone_watermark_ok_safe+0xd/0x170
[491721.324004]  [<ffffffff810e6de8>] balance_pgdat+0x1a8/0x690
[491721.324004]  [<ffffffff810e7438>] kswapd+0x168/0x3f0
[491721.324004]  [<ffffffff816fea26>] ? __schedule+0x3a6/0x750
[491721.324004]  [<ffffffff810553a0>] ? add_wait_queue+0x60/0x60
[491721.324004]  [<ffffffff810e72d0>] ? balance_pgdat+0x690/0x690
[491721.324004]  [<ffffffff8105496e>] kthread+0x8e/0xa0
[491721.324004]  [<ffffffff81708714>] kernel_thread_helper+0x4/0x10
[491721.324004]  [<ffffffff810548e0>] ? kthread_freezable_should_stop+0x70/0x70
[491721.324004]  [<ffffffff81708710>] ? gs_change+0xb/0xb
[491901.327003] INFO: rcu_sched self-detected stall on CPU { 0}  (t=420006 jiffies)

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