linux-kernel - Re: [RFC][PATCH 00/12] various perf fixes

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Date:	Tue, 12 Jan 2016 12:35:57 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	alexander.shishkin@...ux.intel.com,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, vince@...ter.net,
	Andi Kleen <andi@...stfloor.org>, jolsa@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [RFC][PATCH 00/12] various perf fixes

On Tue, Jan 12, 2016 at 12:26 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> Whole assortment:
>
> 2016/01/12 11:57:23 qemu-11: saving crash 'WARNING: CPU: 0 PID: 12905
> at kernel/events/core.c:2651 task_ctx_sched_out+0x8d/0xa0()' to
> crash-qemu-11-1452596243752451147
> 2016/01/12 11:59:50 qemu-0: saving crash 'WARNING: CPU: 3 PID: 24027
> at kernel/events/core.c:2744 ctx_sched_in+0x253/0x1390()' to
> crash-qemu-0-1452596390210686680
> 2016/01/12 12:05:30 qemu-18: saving crash 'WARNING: CPU: 2 PID: 10497
> at kernel/events/core.c:2145 __perf_install_in_context+0x177/0x1b0()'
> to crash-qemu-18-1452596730362194373
> 2016/01/12 12:08:26 qemu-12: saving crash 'WARNING: CPU: 2 PID: 26946
> at kernel/events/core.c:213 event_function+0x4ba/0x590()' to
> crash-qemu-12-1452596906889159952
> 2016/01/12 12:11:09 qemu-3: saving crash 'WARNING: CPU: 1 PID: 27863
> at kernel/events/core.c:213 event_function+0x4ba/0x590()' to
> crash-qemu-3-1452597069411271690
> 2016/01/12 12:13:38 qemu-5: saving crash 'WARNING: CPU: 1 PID: 18036
> at kernel/events/core.c:213 event_function+0x4ba/0x590()' to
> crash-qemu-5-1452597218740474180
> 2016/01/12 12:14:00 qemu-2: saving crash 'WARNING: CPU: 1 PID: 27287
> at kernel/events/core.c:213 event_function+0x4ba/0x590()' to
> crash-qemu-2-1452597240810824249
> 2016/01/12 12:14:21 qemu-13: saving crash 'WARNING: CPU: 0 PID: 24151
> at kernel/events/core.c:213 event_function+0x4ba/0x590()' to
> crash-qemu-13-1452597261384610361
> 2016/01/12 12:15:40 qemu-12: saving crash 'WARNING: CPU: 2 PID: 1802
> at kernel/events/core.c:1698 event_sched_out.isra.86+0x79c/0xf40()' to
> crash-qemu-12-1452597340496838168
> 2016/01/12 12:16:17 qemu-1: saving crash 'WARNING: CPU: 2 PID: 5975 at
> kernel/events/core.c:213 event_function+0x4ba/0x590()' to
> crash-qemu-1-1452597377189059606
> 2016/01/12 12:16:51 qemu-2: saving crash 'WARNING: CPU: 2 PID: 8948 at
> kernel/events/core.c:1698 event_sched_out.isra.86+0x79c/0xf40()' to
> crash-qemu-2-1452597411120105533
> 2016/01/12 12:17:56 qemu-1: saving crash 'WARNING: CPU: 2 PID: 30319
> at kernel/events/core.c:1698 event_sched_out.isra.86+0x79c/0xf40()' to
> crash-qemu-1-1452597476734445707
> 2016/01/12 12:18:52 qemu-7: saving crash 'WARNING: CPU: 1 PID: 31877
> at kernel/events/core.c:213 event_function+0x4ba/0x590()' to
> crash-qemu-7-1452597532508063377
> 2016/01/12 12:19:07 qemu-13: saving crash 'WARNING: CPU: 1 PID: 964 at
> kernel/events/core.c:2145 __perf_install_in_context+0x177/0x1b0()' to
> crash-qemu-13-1452597547020900569
>
>
> Peter,
>
> What do you think if we work on making syzkaller work for you locally?
> I think it will be more efficient than testing on my side. I am ready
> to provide any necessary help. If you are interested please drop a
> email to syzkaller@...glegroups.com.


Also got 2 different stalls, so it's not just WARNINGS.
Difficult to say whether the situation become better or worse, because
it was actively failing in different ways before as well...