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Date: Wed, 6 Nov 2013 15:04:17 -0500 (EST) From: Vince Weaver <vincent.weaver@...ne.edu> To: Vince Weaver <vincent.weaver@...ne.edu> cc: Steven Rostedt <rostedt@...dmis.org>, Linus Torvalds <torvalds@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Jiri Olsa <jolsa@...hat.com>, Dave Jones <davej@...hat.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Frederic Weisbecker <fweisbec@...il.com>, Kees Cook <keescook@...gle.com> Subject: Re: [GIT PULL][PATCH] perf/ftrace: Fix paranoid level for enabling function tracer On Wed, 6 Nov 2013, Vince Weaver wrote: > I've run this patch on top of 3.12 and it seems pretty solid. > I've run my perf_fuzzer for hours (which wasn't possible w/o > quickly crashing on a stock kernel). It turns out there are still tracepoint issues though. I managed to lock my machine hard, even with the patch, but it took a few hours to trigger: [11559.476002] WARNING: CPU: 0 PID: 2994 at kernel/watchdog.c:245 watchdog_overflow_callback+0x9b/0xa6() [11559.476002] Watchdog detected hard LOCKUP on cpu 0 [11559.476002] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg evdev coretemp acpi_cpufreq psmouse serio_raw video wmi pcspkr processor thermal_sys button mcs7830 i2c_nforce2 ohci_pci usbnet ohci_hcd sg ehci_pci ehci_hcd sd_mod usbcore usb_common [11559.476002] CPU: 0 PID: 2994 Comm: perf_fuzzer Tainted: G W 3.12.0 #2 [11559.476002] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012 [11559.476002] 00000000000000f5 ffff88011fc07c48 ffffffff8151aad6 ffff88011fc07c58 [11559.476002] ffffffff8103cd68 ffff88011fc07c78 ffffffff810a101c ffff88011b313400 [11559.476002] ffff88011fc07ef8 ffff88011fc07d58 0000000000000000 ffff88011fc07ca8 [11559.476002] Call Trace: [11559.476002] <NMI> [<ffffffff8151aad6>] ? dump_stack+0x41/0x53 [11559.476002] [<ffffffff8103cd68>] ? warn_slowpath_common+0x81/0x9c [11559.476002] [<ffffffff810a101c>] ? watchdog_overflow_callback+0x9b/0xa6 [11559.476002] [<ffffffff8103ce25>] ? warn_slowpath_fmt+0x46/0x48 [11559.476002] [<ffffffff810c9e5b>] ? perf_prepare_sample+0x1d0/0x2f4 [11559.476002] [<ffffffff810a101c>] ? watchdog_overflow_callback+0x9b/0xa6 [11559.476002] [<ffffffff810ca4a2>] ? __perf_event_overflow+0x12e/0x1ab [11559.476002] [<ffffffff810167d3>] ? intel_pmu_lbr_read+0x253/0x349 [11559.476002] [<ffffffff81018c95>] ? intel_pmu_handle_irq+0x2b8/0x34d [11559.476002] [<ffffffff8101866a>] ? intel_pmu_enable_all+0x4e/0xa7 [11559.476002] [<ffffffff8151edfc>] ? nmi_handle+0xa8/0x13a [11559.476002] [<ffffffff8151f473>] ? perf_event_nmi_handler+0x24/0x3d [11559.476002] [<ffffffff8151edb2>] ? nmi_handle+0x5e/0x13a [11559.476002] [<ffffffff8151ef35>] ? do_nmi+0xa7/0x2bd [11559.476002] [<ffffffff8151e537>] ? end_repeat_nmi+0x1e/0x2e [11559.476002] [<ffffffff81049982>] ? __sigqueue_alloc+0x9e/0xc4 [11559.476002] [<ffffffff81049982>] ? __sigqueue_alloc+0x9e/0xc4 [11559.476002] [<ffffffff81049982>] ? __sigqueue_alloc+0x9e/0xc4 [11559.476002] <<EOE>> <IRQ> [<ffffffff8104acaa>] ? __send_signal+0xd8/0x26f [11559.476002] [<ffffffff8104b074>] ? do_send_sig_info+0x4b/0x75 [11559.476002] [<ffffffff810ca8a5>] ? perf_tp_event+0xe9/0x1f6 [11559.476002] [<ffffffff8111f65e>] ? send_sigio_to_task+0xc6/0xf5 [11559.476002] [<ffffffff8111f737>] ? send_sigio+0xaa/0xdd [11559.476002] [<ffffffff8111f7d3>] ? kill_fasync+0x69/0x86 [11559.476002] [<ffffffff810cabf9>] ? perf_event_wakeup+0x8c/0xa1 [11559.476002] [<ffffffff810c494d>] ? __irq_work_run+0x5f/0x7b [11559.476002] [<ffffffff81005f82>] ? smp_trace_irq_work_interrupt+0x4b/0x7e [11559.476002] [<ffffffff815261ca>] ? trace_irq_work_interrupt+0x6a/0x70 [11559.476002] [<ffffffff810461bf>] ? perf_trace_timer_class+0x39/0x98 [11559.476002] [<ffffffff8151da07>] ? _raw_spin_unlock_irqrestore+0xf/0x11 [11559.476002] [<ffffffff810a3a89>] ? rcu_process_callbacks+0x4a4/0x4b8 [11559.476002] [<ffffffff8105b8f3>] ? enqueue_hrtimer+0x51/0x7b [11559.476002] [<ffffffff81041027>] ? __do_softirq+0x102/0x208 [11559.476002] [<ffffffff81027608>] ? lapic_next_event+0x1d/0x21 [11559.476002] [<ffffffff8105c187>] ? hrtimer_interrupt+0x119/0x1c6 [11559.476002] [<ffffffff815263dc>] ? call_softirq+0x1c/0x30 [11559.476002] [<ffffffff810041b9>] ? do_softirq+0x38/0x6d [11559.476002] [<ffffffff81040d1c>] ? irq_exit+0x45/0xa1 [11559.476002] [<ffffffff81526a14>] ? smp_trace_apic_timer_interrupt+0x83/0x91 [11559.476002] [<ffffffff8152597a>] ? trace_apic_timer_interrupt+0x6a/0x70 [11559.476002] <EOI> [11559.476002] ---[ end trace 1274fa8d9fb13c66 ]--- [11559.476002] perf samples too long (7791497 > 10000), lowering kernel.perf_event_max_sample_rate to 12500 [11559.476002] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 1025.396 msecs [11570.756001] perf samples too long (7730632 > 20000), lowering kernel.perf_event_max_sample_rate to 6250 [11571.580001] perf samples too long (7670242 > 40000), lowering kernel.perf_event_max_sample_rate to 3250 [11572.428001] perf samples too long (7610324 > 76923), lowering kernel.perf_event_max_sample_rate to 1750 [11573.276001] perf samples too long (7550874 > 142857), lowering kernel.perf_event_max_sample_rate to 1000 [11574.124001] perf samples too long (7491888 > 250000), lowering kernel.perf_event_max_sample_rate to 500 [11574.968001] perf samples too long (7433363 > 500000), lowering kernel.perf_event_max_sample_rate to 250 -- 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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