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SubjectRe: perf/tracepoint: another fuzzer generated lockup
On Fri, Nov 08, 2013 at 04:15:21PM -0500, Vince Weaver wrote:
> On Fri, 8 Nov 2013, Frederic Weisbecker wrote:
>
> > On Fri, Nov 08, 2013 at 03:23:07PM -0500, Vince Weaver wrote:
> > > On Fri, 8 Nov 2013, Frederic Weisbecker wrote:
> > > >
> > > > There seem to be a loop that takes too long in intel_pmu_handle_irq(). Your two
> > > > previous reports seemed to suggest that lbr is involved, but not this one.
> > >
> > > I may be wrong but I think everything between <NMI> and <EOE> is just
> > > noise from the NMI perf-event watchdog timer kicking in.
> >
> > Ah good point.
> >
> > So the pattern seem to be that irq work/perf_event_wakeup is involved, may be
> > interrupting a tracepoint event or so.
>
> I managed to construct a reproducible test case, which is attached. I
> sometimes have to run it 5-10 times before it triggers.
>

Ah with this I can reproduce. I need to run it into a loop for a few seconds to trigger it:

[ 91.750943] ------------[ cut here ]------------
[ 91.755440] WARNING: CPU: 1 PID: 968 at kernel/watchdog.c:246 watchdog_overflow_callback+0x9a/0xc0()
[ 91.764530] Watchdog detected hard LOCKUP on cpu 1
[ 91.769121] Modules linked in:
[ 91.772328] CPU: 1 PID: 968 Comm: out Not tainted 3.12.0+ #47
[ 91.778042] Hardware name: FUJITSU SIEMENS AMD690VM-FMH/AMD690VM-FMH, BIOS V5.13 03/14/2008
[ 91.786358] 00000000000000f6 ffff880107c87bd8 ffffffff815bac1a ffff8800cd0bafa0
[ 91.793714] ffff880107c87c28 ffff880107c87c18 ffffffff8104dffc ffff880107c87e08
[ 91.801076] ffff880103d20000 0000000000000000 ffff880107c87d38 0000000000000000
[ 91.808444] Call Trace:
[ 91.810869] <NMI> [<ffffffff815bac1a>] dump_stack+0x4f/0x7c
[ 91.816589] [<ffffffff8104dffc>] warn_slowpath_common+0x8c/0xc0
[ 91.822564] [<ffffffff8104e0e6>] warn_slowpath_fmt+0x46/0x50
[ 91.828281] [<ffffffff810ef2ea>] watchdog_overflow_callback+0x9a/0xc0
[ 91.834777] [<ffffffff8111bc78>] __perf_event_overflow+0x98/0x310
[ 91.840928] [<ffffffff81118a40>] ? perf_event_task_disable+0x90/0x90
[ 91.847336] [<ffffffff8111cb44>] perf_event_overflow+0x14/0x20
[ 91.853227] [<ffffffff81019eda>] x86_pmu_handle_irq+0x12a/0x180
[ 91.859198] [<ffffffff81018ad4>] perf_event_nmi_handler+0x34/0x60
[ 91.865353] [<ffffffff81006f76>] nmi_handle.isra.3+0xc6/0x3e0
[ 91.871154] [<ffffffff81006eb5>] ? nmi_handle.isra.3+0x5/0x3e0
[ 91.877045] [<ffffffff8102fd60>] ? perf_ibs_handle_irq+0x420/0x420
[ 91.883275] [<ffffffff810073a0>] do_nmi+0x110/0x390
[ 91.888219] [<ffffffff815c9631>] end_repeat_nmi+0x1e/0x2e
[ 91.893676] [<ffffffff812ef38d>] ? delay_tsc+0x6d/0xc0
[ 91.898871] [<ffffffff812ef38d>] ? delay_tsc+0x6d/0xc0
[ 91.904068] [<ffffffff812ef38d>] ? delay_tsc+0x6d/0xc0
[ 91.909258] <<EOE>> <IRQ> [<ffffffff812ef27f>] __delay+0xf/0x20
[ 91.915415] [<ffffffff812ef2b7>] __const_udelay+0x27/0x30
[ 91.920873] [<ffffffff810ba31c>] __rcu_read_unlock+0x5c/0xa0
[ 91.926589] [<ffffffff811815b3>] kill_fasync+0x163/0x2a0
[ 91.931958] [<ffffffff81181476>] ? kill_fasync+0x26/0x2a0
[ 91.937414] [<ffffffff812ef2b7>] ? __const_udelay+0x27/0x30
[ 91.943045] [<ffffffff8111988e>] perf_event_wakeup+0x15e/0x290
[ 91.948935] [<ffffffff81119730>] ? __perf_event_task_sched_out+0x540/0x540
[ 91.955864] [<ffffffff811199f7>] perf_pending_event+0x37/0x60
[ 91.961667] [<ffffffff81112bb7>] __irq_work_run+0x77/0xa0
[ 91.967122] [<ffffffff81112c58>] irq_work_run+0x18/0x30
[ 91.972404] [<ffffffff810080ad>] smp_trace_irq_work_interrupt+0x3d/0x2a0
[ 91.979163] [<ffffffff815cb132>] trace_irq_work_interrupt+0x72/0x80
[ 91.985486] [<ffffffff815c8fb7>] ? retint_restore_args+0x13/0x13
[ 91.991548] [<ffffffff815c877a>] ? _raw_spin_unlock_irqrestore+0x7a/0x90
[ 91.998305] [<ffffffff810c101b>] rcu_process_callbacks+0x1db/0x530
[ 92.004541] [<ffffffff8105381d>] __do_softirq+0xdd/0x490
[ 92.009911] [<ffffffff81053fe6>] irq_exit+0x96/0xc0
[ 92.014849] [<ffffffff815cbc3a>] smp_trace_apic_timer_interrupt+0x5a/0x2b4
[ 92.021777] [<ffffffff815ca7b2>] trace_apic_timer_interrupt+0x72/0x80
[ 92.028264] <EOI> [<ffffffff81180a95>] ? f_setown+0x5/0x150
[ 92.033990] [<ffffffff81180d3a>] ? SyS_fcntl+0xda/0x640
[ 92.039267] [<ffffffff812f06ae>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 92.045683] [<ffffffff815c9aa9>] system_call_fastpath+0x16/0x1b
[ 92.051657] ---[ end trace cd18ca1175c8c7fd ]---
[ 92.056246] perf samples too long (2385259 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 92.065604] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 314.659 msecs
[ 101.744824] perf samples too long (2366626 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
[ 111.738707] perf samples too long (2348139 > 10000), lowering kernel.perf_event_max_sample_rate to 13000
[ 121.732589] perf samples too long (2329797 > 19230), lowering kernel.perf_event_max_sample_rate to 7000
[ 131.726473] perf samples too long (2311632 > 35714), lowering kernel.perf_event_max_sample_rate to 4000
[ 141.720356] perf samples too long (2293575 > 62500), lowering kernel.perf_event_max_sample_rate to 2000
[ 151.714239] perf samples too long (2275693 > 125000), lowering kernel.perf_event_max_sample_rate to 1000


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