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Date: Tue, 09 Jul 2013 19:09:51 -0400 From: Sasha Levin <sasha.levin@...cle.com> To: Dave Jones <davej@...hat.com>, Tejun Heo <tj@...nel.org>, tglx@...utronix.de, Peter Zijlstra <peterz@...radead.org>, LKML <linux-kernel@...r.kernel.org>, trinity@...r.kernel.org Subject: Re: timer: lockup in run_timer_softirq() On 07/09/2013 07:03 PM, Dave Jones wrote: > On Tue, Jul 09, 2013 at 06:49:29PM -0400, Sasha Levin wrote: > > On 07/09/2013 06:47 PM, Dave Jones wrote: > > > > > [ 2536.500130] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took too long to run: > > > > 697182.008 msecs > > > > > > I've been reporting these (and other traces) for a while https://lkml.org/lkml/2013/7/5/185 [1] > > > on bare-metal. > > > > Interesting. It's the first time I'm seeing these, but I haven't really changed > > anything in my configuration. > > > > Are you also seeing the "NMI handler took too long" messages? > > Now that I look closer, one difference is you're seeing arch_trigger_all_cpu_backtrace_handler > in that message. I'm seeing them from perf_event_nmi_handler. perf huh? I also have this spew I'm currently working on, it seems related: [ 1443.380407] ------------[ cut here ]------------ [ 1443.381713] WARNING: CPU: 20 PID: 49263 at kernel/lockdep.c:3552 check_flags+0x16b/0x220() [ 1443.383988] DEBUG_LOCKS_WARN_ON(current->softirqs_enabled) [ 1443.385452] Modules linked in: [ 1443.386459] CPU: 20 PID: 49263 Comm: trinity-child50 Tainted: G W 3.10.0-next-20130709-sasha #3953 [ 1443.388735] 0000000000000de0 ffff880805e03ab8 ffffffff84191329 ffffffff8519f386 [ 1443.390082] ffff880805e03b08 ffff880805e03af8 ffffffff811279cc ffffffff8519f386 [ 1443.390082] 0000000000000000 ffff8807cf898000 ffffffff85a66940 0000000000000082 [ 1443.390082] Call Trace: [ 1443.390082] <IRQ> [<ffffffff84191329>] dump_stack+0x52/0x87 [ 1443.390082] [<ffffffff811279cc>] warn_slowpath_common+0x8c/0xc0 [ 1443.390082] [<ffffffff81127ab6>] warn_slowpath_fmt+0x46/0x50 [ 1443.390082] [<ffffffff8419d649>] ? sub_preempt_count+0x9/0xf0 [ 1443.390082] [<ffffffff811a192b>] check_flags+0x16b/0x220 [ 1443.390082] [<ffffffff811a2ee7>] lock_is_held+0x77/0x110 [ 1443.390082] [<ffffffff8419d644>] ? sub_preempt_count+0x4/0xf0 [ 1443.390082] [<ffffffff8122dafe>] perf_tp_event+0xbe/0x450 [ 1443.390082] [<ffffffff8122de62>] ? perf_tp_event+0x422/0x450 [ 1443.390082] [<ffffffff8419d644>] ? sub_preempt_count+0x4/0xf0 [ 1443.390082] [<ffffffff812185f2>] perf_ftrace_function_call+0xc2/0xe0 [ 1443.390082] [<ffffffff811f8c78>] ? ftrace_ops_control_func+0xc8/0x140 [ 1443.427495] [<ffffffff8419d644>] ? sub_preempt_count+0x4/0xf0 [ 1443.427495] [<ffffffff81131917>] ? __local_bh_enable+0xc7/0xd0 [ 1443.427495] [<ffffffff811f8c78>] ftrace_ops_control_func+0xc8/0x140 [ 1443.427495] [<ffffffff841a1c3c>] ftrace_call+0x5/0x2f [ 1443.427495] [<ffffffff841a1c3c>] ? ftrace_call+0x5/0x2f [ 1443.427495] [<ffffffff81175b87>] ? vtime_account_irq_exit+0x67/0x80 [ 1443.427495] [<ffffffff8419d649>] ? sub_preempt_count+0x9/0xf0 [ 1443.427495] [<ffffffff8419d649>] ? sub_preempt_count+0x9/0xf0 [ 1443.427495] [<ffffffff8113185e>] ? __local_bh_enable+0xe/0xd0 [ 1443.427495] [<ffffffff8419d649>] ? sub_preempt_count+0x9/0xf0 [ 1443.427495] [<ffffffff81131917>] __local_bh_enable+0xc7/0xd0 [ 1443.427495] [<ffffffff81132d07>] __do_softirq+0x447/0x4d0 [ 1443.427495] [<ffffffff8419d649>] ? sub_preempt_count+0x9/0xf0 [ 1443.427495] [<ffffffff81132ed6>] irq_exit+0x86/0x120 [ 1443.427495] [<ffffffff841a43ea>] smp_apic_timer_interrupt+0x4a/0x60 [ 1443.427495] [<ffffffff841a2d32>] apic_timer_interrupt+0x72/0x80 [ 1443.427495] <EOI> [<ffffffff81130542>] ? do_setitimer+0x242/0x2a0 [ 1443.427495] [<ffffffff8419871c>] ? _raw_spin_unlock_irq+0x4c/0x80 [ 1443.427495] [<ffffffff84198700>] ? _raw_spin_unlock_irq+0x30/0x80 [ 1443.427495] [<ffffffff81130542>] do_setitimer+0x242/0x2a0 [ 1443.427495] [<ffffffff811306fa>] alarm_setitimer+0x3a/0x70 [ 1443.427495] [<ffffffff8113b41e>] SyS_alarm+0xe/0x20 [ 1443.427495] [<ffffffff841a2240>] tracesys+0xdd/0xe2 [ 1443.427495] ---[ end trace e3b9a6b9c7462a51 ]--- -- 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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