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From: Dave Jones <davej@redhat.com>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>, vincent.weaver@maine.edu
Subject: x86_pmu_start WARN_ON.
Date: Thu, 30 Jan 2014 14:02:53 -0500	[thread overview]
Message-ID: <20140130190253.GA11819@redhat.com> (raw)

I gave Vince's perf_fuzzer a run, hoping to trigger a different perf bug
that I've been seeing. Instead I hit a different bug.

WARNING: CPU: 1 PID: 9277 at arch/x86/kernel/cpu/perf_event.c:1076 x86_pmu_start+0xd1/0x110()
CPU: 1 PID: 9277 Comm: perf_fuzzer Not tainted 3.13.0+ #101
 0000000000000009 0000000047887442 ffff88024d043da8 ffffffffbd7387ba
 0000000000000000 ffff88024d043de0 ffffffffbd06d28d ffff88024d04bba0
 ffff880104c9ef60 0000000000000004 0000000000000002 ffff88024d04bddc
Call Trace:
 <IRQ>  [<ffffffffbd7387ba>] dump_stack+0x4e/0x7a
 [<ffffffffbd06d28d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffffbd06d3ba>] warn_slowpath_null+0x1a/0x20
 [<ffffffffbd018421>] x86_pmu_start+0xd1/0x110
 [<ffffffffbd018b9f>] x86_pmu_enable+0x22f/0x320
 [<ffffffffbd150bca>] perf_pmu_enable+0x2a/0x30
 [<ffffffffbd152711>] perf_cpu_hrtimer_handler+0xe1/0x1f0
 [<ffffffffbd097582>] __run_hrtimer+0x72/0x250
 [<ffffffffbd152630>] ? perf_event_context_sched_in.isra.85+0xc0/0xc0
 [<ffffffffbd097e97>] hrtimer_interrupt+0x107/0x260
 [<ffffffffbd030744>] local_apic_timer_interrupt+0x34/0x60
 [<ffffffffbd74deba>] smp_trace_apic_timer_interrupt+0x4a/0x125
 [<ffffffffbd74cb2f>] trace_apic_timer_interrupt+0x6f/0x80
 <EOI>  [<ffffffffbd743e4d>] ? retint_swapgs+0xe/0x13

1076         if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))
1077                 return;


It reproduces pretty quickly for me (within a minute or two of runtime).
Oddly the generated test case from the log file doesn't reproduce.

	Dave


             reply	other threads:[~2014-01-30 19:03 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-30 19:02 Dave Jones [this message]
2014-02-10 21:26 ` x86_pmu_start WARN_ON Vince Weaver
2014-02-11 13:29   ` Peter Zijlstra
2014-02-12 21:04     ` Vince Weaver
2014-02-13 14:11       ` Vince Weaver
2014-02-13 17:35         ` Vince Weaver
2014-02-13 22:13           ` Vince Weaver
2014-02-17 15:28             ` Peter Zijlstra
2014-02-18 18:30               ` Vince Weaver
2014-02-18 22:20                 ` Vince Weaver
2014-02-19 10:19                   ` Peter Zijlstra
2014-02-19 22:34                     ` Vince Weaver
2014-02-20 10:08                       ` Peter Zijlstra
2014-02-20 15:47                         ` Andi Kleen
2014-02-20 15:54                           ` Peter Zijlstra
2014-02-20 17:31                             ` Andi Kleen
2014-02-20 18:15                               ` Peter Zijlstra
2014-02-20 18:23                                 ` Andi Kleen
2014-02-20 19:04                                 ` Steven Rostedt
2014-02-20 16:26                         ` Steven Rostedt
2014-02-20 17:00                           ` Peter Zijlstra
2014-02-20 17:43                             ` Steven Rostedt
2014-02-20 17:46                               ` Steven Rostedt
2014-02-20 18:18                                 ` Peter Zijlstra
2014-02-20 18:03                         ` Vince Weaver
2014-02-20 18:23                           ` Peter Zijlstra
2014-02-20 18:54                             ` Vince Weaver
2014-02-20 19:21                               ` Vince Weaver
2014-02-20 19:46                                 ` Vince Weaver
2014-02-21 14:37                                   ` Vince Weaver
2014-02-21 15:03                             ` Peter Zijlstra
2014-02-21 20:18                               ` Vince Weaver
2014-02-24 11:28                                 ` Peter Zijlstra
2014-02-26  5:59                                   ` Vince Weaver
2014-02-27 13:32                               ` [tip:perf/core] perf/x86: Fix event scheduling tip-bot for Peter Zijlstra

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