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Date: Mon, 2 Feb 2015 16:42:40 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, eranian@gmail.com,
        jolsa@redhat.com, mark.rutland@arm.com, torvalds@linux-foundation.org,
        tglx@linutronix.de
Subject: Re: [RFC][PATCH 2/3] perf: Add a bit of paranoia
Message-ID: <20150202154240.GG26304@twins.programming.kicks-ass.net>
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On Mon, Feb 02, 2015 at 01:33:14AM -0500, Vince Weaver wrote:
> On Thu, 29 Jan 2015, Peter Zijlstra wrote:
> 
> > That said, it does need to do that sibling first leaders later install
> > order too. So I've put the below on top.
> 
> so I've lost track of exactly which patches I should be running (do I need 
> to apply both of the additional patches?)

Probably, lemme try and get all of the current stuff in tip/master to
make for easier testing.

> Meanwhile my haswell was still fuzzing away (without those two 
> updated patches) until it triggered the below and crashed.
> 
> [407484.309136] ------------[ cut here ]------------
> [407484.314590] WARNING: CPU: 3 PID: 27209 at kernel/watchdog.c:290 watchdog_overflow_callback+0x92/0xc0()
> [407484.325090] Watchdog detected hard LOCKUP on cpu 3
> [407484.330093] Modules linked in: btrfs xor raid6_pq ntfs vfat msdos fat dm_mod fuse x86_pkg_temp_thermal intel_powerclamp intel_rapl iosf_mbi coretemp kvm crct10dif_pclmul snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic crc32_pclmul snd_hda_intel ghash_clmulni_intel snd_hda_controller aesni_intel snd_hda_codec aes_x86_64 snd_hwdep lrw gf128mul snd_pcm ppdev glue_helper xhci_pci mei_me iTCO_wdt iTCO_vendor_support i915 snd_timer drm_kms_helper snd drm ablk_helper lpc_ich mfd_core evdev pcspkr parport_pc psmouse cryptd soundcore i2c_i801 serio_raw parport xhci_hcd mei wmi tpm_tis tpm video battery button processor i2c_algo_bit sg sr_mod sd_mod cdrom ahci libahci e1000e ehci_pci libata ptp ehci_hcd crc32c_intel usbcore scsi_mod usb_common pps_core thermal fan thermal_sys
> [407484.408496] CPU: 3 PID: 27209 Comm: perf_fuzzer Tainted: G        W      3.19.0-rc6+ #126
> [407484.417914] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
> [407484.426497]  ffffffff81a3d3da ffff88011eac5aa0 ffffffff816b6761 0000000000000000
> [407484.435161]  ffff88011eac5af0 ffff88011eac5ae0 ffffffff8106dcda ffff88011eac5b00
> [407484.443900]  ffff8801195f9800 0000000000000001 ffff88011eac5c40 ffff88011eac5ef8
> [407484.452588] Call Trace:
> [407484.455862]  <NMI>  [<ffffffff816b6761>] dump_stack+0x45/0x57
> [407484.462741]  [<ffffffff8106dcda>] warn_slowpath_common+0x8a/0xc0
> [407484.469851]  [<ffffffff8106dd56>] warn_slowpath_fmt+0x46/0x50
> [407484.476743]  [<ffffffff8101d90a>] ? native_sched_clock+0x2a/0x90
> [407484.483888]  [<ffffffff8101d90a>] ? native_sched_clock+0x2a/0x90
> [407484.490999]  [<ffffffff8111b922>] watchdog_overflow_callback+0x92/0xc0
> [407484.498672]  [<ffffffff8115c3f1>] __perf_event_overflow+0x91/0x270
> [407484.505984]  [<ffffffff8102b15a>] ? x86_perf_event_set_period+0xca/0x170
> [407484.513834]  [<ffffffff8115ced9>] perf_event_overflow+0x19/0x20
> [407484.520812]  [<ffffffff8103266a>] intel_pmu_handle_irq+0x1ba/0x3a0
> [407484.528119]  [<ffffffff8102a04b>] perf_event_nmi_handler+0x2b/0x50
> [407484.535402]  [<ffffffff81018610>] nmi_handle+0xa0/0x150
> [407484.541701]  [<ffffffff81018575>] ? nmi_handle+0x5/0x150
> [407484.548069]  [<ffffffff810188ba>] default_do_nmi+0x4a/0x140
> [407484.554692]  [<ffffffff81018a48>] do_nmi+0x98/0xe0
> [407484.560517]  [<ffffffff816c0bf1>] end_repeat_nmi+0x1e/0x2e
> [407484.567054]  [<ffffffff81058bff>] ? perf_get_regs_user+0xbf/0x190
> [407484.574256]  [<ffffffff81058bff>] ? perf_get_regs_user+0xbf/0x190
> [407484.581431]  [<ffffffff81058bff>] ? perf_get_regs_user+0xbf/0x190
> [407484.588602]  <<EOE>>  <IRQ>  [<ffffffff8115c28c>] perf_prepare_sample+0x2ec/0x3c0
> [407484.597358]  [<ffffffff8115c46e>] __perf_event_overflow+0x10e/0x270
> [407484.604708]  [<ffffffff8115c439>] ? __perf_event_overflow+0xd9/0x270
> [407484.612215]  [<ffffffff8115c924>] ? perf_tp_event+0xc4/0x210
> [407484.619000]  [<ffffffff8115cfe2>] ? __perf_sw_event+0x72/0x1f0
> [407484.625937]  [<ffffffff8115c799>] ? perf_swevent_overflow+0xa9/0xe0
> [407484.633287]  [<ffffffff8115c799>] perf_swevent_overflow+0xa9/0xe0
> [407484.640467]  [<ffffffff8115c837>] perf_swevent_event+0x67/0x90
> [407484.647343]  [<ffffffff8115c924>] perf_tp_event+0xc4/0x210
> [407484.653923]  [<ffffffff810b6fa9>] ? lock_acquire+0x119/0x130
> [407484.660606]  [<ffffffff810b3cf6>] ? perf_trace_lock_acquire+0x146/0x180
> [407484.668332]  [<ffffffff810b594f>] ? __lock_acquire.isra.31+0x3af/0xfe0
> [407484.675962]  [<ffffffff810b3cf6>] perf_trace_lock_acquire+0x146/0x180
> [407484.683490]  [<ffffffff810b6fa9>] ? lock_acquire+0x119/0x130
> [407484.690211]  [<ffffffff810b6fa9>] lock_acquire+0x119/0x130
> [407484.696750]  [<ffffffff8115b7f5>] ? perf_event_wakeup+0x5/0xf0
> [407484.703640]  [<ffffffff811f50ef>] ? kill_fasync+0xf/0xf0
> [407484.710008]  [<ffffffff8115b828>] perf_event_wakeup+0x38/0xf0
> [407484.716798]  [<ffffffff8115b7f5>] ? perf_event_wakeup+0x5/0xf0
> [407484.723696]  [<ffffffff8115b913>] perf_pending_event+0x33/0x60
> [407484.730570]  [<ffffffff8114cc7c>] irq_work_run_list+0x4c/0x80
> [407484.737392]  [<ffffffff8114ccc8>] irq_work_run+0x18/0x40
> [407484.743765]  [<ffffffff8101955f>] smp_trace_irq_work_interrupt+0x3f/0xc0
> [407484.751579]  [<ffffffff816c01fd>] trace_irq_work_interrupt+0x6d/0x80
> [407484.759046]  <EOI>  [<ffffffff810b6f4d>] ? lock_acquire+0xbd/0x130
> [407484.766380]  [<ffffffff811f4f42>] ? SyS_fcntl+0x5b2/0x650
> [407484.772786]  [<ffffffff816bdb31>] _raw_spin_lock+0x31/0x40
> [407484.779321]  [<ffffffff811f4f42>] ? SyS_fcntl+0x5b2/0x650
> [407484.785813]  [<ffffffff811f4f42>] SyS_fcntl+0x5b2/0x650
> [407484.792109]  [<ffffffff816be6ed>] system_call_fastpath+0x16/0x1b
> [407484.799195] ---[ end trace 55752a03ec8ab979 ]---

That looks like tail recursive fun! An irq work that raises and irq work
ad infinitum. Lemme see if I can squash that.. didn't we have something
like this before... /me goes look.

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