linux-kernel - Re: [RFC][PATCH 0/3] perf fixes

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Date:	Mon, 26 Jan 2015 13:03:47 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Vince Weaver <vincent.weaver@...ne.edu>
cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, eranian@...il.com, jolsa@...hat.com,
	mark.rutland@....com, torvalds@...ux-foundation.org,
	tglx@...utronix.de
Subject: Re: [RFC][PATCH 0/3] perf fixes

On Mon, 26 Jan 2015, Vince Weaver wrote:

> I applied this to (just before) 3.19-rc6 and let it run on my 
> troublemaking Haswell machine overnight.  It is looking good!

spoke too soon, managed to trigger one of the new warnings you added.

This is
        WARN_ON_ONCE(event->ctx != ctx);
in event_sched_out()

[42437.159176] ------------[ cut here ]------------
[42437.164613] WARNING: CPU: 1 PID: 15433 at kernel/events/core.c:1525 event_sched_out.isra.72+0x25e/0x2c0()
[42437.175338] Modules linked in: fuse x86_pkg_temp_thermal intel_powerclamp intel_rapl iosf_mbi coretemp kvm snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_intel crct10dif_pclmul snd_hda_controller crc32_pclmul ppdev ghash_clmulni_intel iTCO_wdt iTCO_vendor_support aesni_intel aes_x86_64 lpc_ich mfd_core evdev lrw mei_me i915 psmouse snd_hda_codec mei xhci_pci gf128mul i2c_i801 serio_raw xhci_hcd glue_helper snd_hwdep snd_pcm ablk_helper cryptd snd_timer drm_kms_helper parport_pc parport tpm_tis pcspkr snd tpm drm battery video soundcore wmi i2c_algo_bit button processor sg sr_mod sd_mod cdrom ehci_pci ehci_hcd ahci libahci e1000e libata ptp usbcore scsi_mod usb_common pps_core crc32c_intel thermal fan thermal_sys
[42437.248890] CPU: 1 PID: 15433 Comm: perf_fuzzer Tainted: G        W      3.19.0-rc5+ #125
[42437.258294] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[42437.266772]  ffffffff81a3f194 ffff8800c83bfbc8 ffffffff816b6741 0000000000000000
[42437.275427]  0000000000000000 ffff8800c83bfc08 ffffffff8106dcda 01926893541204d2
[42437.284054]  ffff8800c69a4800 ffff88011ea5ced0 ffff88011ea5ced4 ffff880118ce4000
[42437.292660] Call Trace:
[42437.295915]  [<ffffffff816b6741>] dump_stack+0x45/0x57
[42437.302023]  [<ffffffff8106dcda>] warn_slowpath_common+0x8a/0xc0
[42437.309080]  [<ffffffff8106ddca>] warn_slowpath_null+0x1a/0x20
[42437.315950]  [<ffffffff811587ee>] event_sched_out.isra.72+0x25e/0x2c0
[42437.323445]  [<ffffffff811588c1>] group_sched_out+0x71/0xd0
[42437.330045]  [<ffffffff8101d90a>] ? native_sched_clock+0x2a/0x90
[42437.337116]  [<ffffffff81158d2e>] ctx_sched_out+0xee/0x150
[42437.343610]  [<ffffffff81158dcb>] task_ctx_sched_out+0x3b/0x80
[42437.350461]  [<ffffffff8115a489>] __perf_install_in_context+0x79/0x1e0
[42437.358073]  [<ffffffff81154570>] remote_function+0x50/0x60
[42437.364702]  [<ffffffff810ef53e>] generic_exec_single+0x12e/0x190
[42437.371828]  [<ffffffff81154520>] ? task_clock_event_add+0x40/0x40
[42437.379083]  [<ffffffff810ef607>] smp_call_function_single+0x67/0xa0
[42437.386491]  [<ffffffff81153419>] task_function_call+0x49/0x60
[42437.393364]  [<ffffffff8115a410>] ? perf_cpu_hrtimer_handler+0x270/0x270
[42437.401167]  [<ffffffff811549fb>] perf_install_in_context+0x8b/0x100
[42437.408611]  [<ffffffff8115e082>] SYSC_perf_event_open+0x892/0xc60
[42437.415841]  [<ffffffff8115e89e>] SyS_perf_event_open+0xe/0x10
[42437.422680]  [<ffffffff816be6ad>] system_call_fastpath+0x16/0x1b
[42437.429728] ---[ end trace 963de0bbaca247a8 ]---

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