and the perf_fuzzer overnight triggered this possibly related warning in x86_pmu_stop()
I assume it's this code (the line numbers don't match up for some reason). if (__test_and_clear_bit(hwc->idx, cpuc->active_mask)) { x86_pmu.disable(event); cpuc->events[hwc->idx] = NULL; WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); hwc->state |= PERF_HES_STOPPED; } so possibly also related to PERF_HES_STOPPED? [25526.987821] ------------[ cut here ]------------ [25526.988047] WARNING: CPU: 1 PID: 3849 at arch/x86/kernel/cpu/perf_event.c:1221 x86_pmu_stop+0x71/0xa6() [25526.988047] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 usbnet ohci_pci evdev video wmi psmouse serio_raw coretemp i2c_nforce2 ohci_hcd acpi_cpufreq processor pcspkr thermal_sys button sg ehci_pci ehci_hcd sd_mod usbcore usb_common [25526.988047] CPU: 1 PID: 3849 Comm: perf_fuzzer Tainted: G W 3.14.0-rc3+ #17 [25526.988047] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012 [25526.988047] 00000000000004c5 ffff88011fc83ca8 ffffffff81530d11 00000000000004c5 [25526.988047] 0000000000000000 ffff88011fc83ce8 ffffffff8103fce4 ffff88011fc83d28 [25526.988047] ffffffff81012ca0 ffff8800c9be6000 0000000000000004 ffff88011fc8b940 [25526.988047] Call Trace: [25526.988047] <IRQ> [<ffffffff81530d11>] dump_stack+0x49/0x60 [25526.988047] [<ffffffff8103fce4>] warn_slowpath_common+0x81/0x9b [25526.988047] [<ffffffff81012ca0>] ? x86_pmu_stop+0x71/0xa6 [25526.988047] [<ffffffff8103fd18>] warn_slowpath_null+0x1a/0x1c [25526.988047] [<ffffffff81012ca0>] x86_pmu_stop+0x71/0xa6 [25526.988047] [<ffffffff81012e7b>] x86_pmu_del+0x3d/0xb8 [25526.988047] [<ffffffff810ca936>] event_sched_out+0x92/0x121 [25526.988047] [<ffffffff810cd124>] group_sched_in+0xf7/0x147 [25526.988047] [<ffffffff810cd2d2>] ctx_sched_in+0x15e/0x185 [25526.988047] [<ffffffff810cd362>] perf_event_sched_in+0x69/0x71 [25526.988047] [<ffffffff810cd594>] perf_cpu_hrtimer_handler+0x13a/0x1b0 [25526.988047] [<ffffffff8105e5b5>] __run_hrtimer+0xba/0x145 [25526.988047] [<ffffffff810cd45a>] ? __perf_install_in_context+0xf0/0xf0 [25526.988047] [<ffffffff8105e88a>] hrtimer_interrupt+0xd5/0x1c3 [25526.988047] [<ffffffff8102b593>] local_apic_timer_interrupt+0x58/0x5d [25526.988047] [<ffffffff8102bf4f>] smp_trace_apic_timer_interrupt+0x53/0x91 [25526.988047] [<ffffffff8153bafa>] trace_apic_timer_interrupt+0x6a/0x70 [25526.988047] <EOI> [<ffffffff8153ade6>] ? system_call_fastpath+0x1a/0x1f [25526.988047] ---[ end trace d5252ca58550eb43 ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/