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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	linux-kernel@vger.kernel.org,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andy Lutomirski <luto@kernel.org>
Subject: Re: perf: fuzzer causes stack going in wrong direction warnings
Date: Sat, 5 May 2018 13:29:12 -0500	[thread overview]
Message-ID: <20180505182912.llj7jb3v7yd43t5h@treble> (raw)
In-Reply-To: <alpine.DEB.2.21.1805051134230.11518@macbook-air>

On Sat, May 05, 2018 at 11:38:16AM -0400, Vince Weaver wrote:
> On Fri, 4 May 2018, Josh Poimboeuf wrote:
> > 
> > The 'nmi_restore' warning points to a bug in my patch, but the others
> > are head scratchers.  Here's a patch which combines the first two
> > patches, plus improves the existing warnings a bit.  Can you try it?
> 
> with that updated patch I hit
> 
> May  4 21:51:20 haswell kernel: [19245.450607] WARNING: stack recursion on stack type 2
> May  4 22:21:29 haswell kernel: [21055.268717] WARNING: can't dereference registers at 000000006546ba71 for ip ret_from_intr+0x6/0x1d
> May  4 22:36:22 haswell kernel: [21948.106762] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xe/0x90
> May  4 22:36:22 haswell kernel: [21948.115377] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xe/0x90
> May  4 22:36:22 haswell kernel: [21948.124086] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xd/0x90
> May  4 22:36:22 haswell kernel: [21948.124088] WARNING: stack going in the wrong direction? ip=intel_pmu_handle_irq+0x12/0x4a0
> May  4 22:36:22 haswell kernel: [21948.124097] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xe/0x90
> May  4 22:36:22 haswell kernel: [21948.150189] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xe/0x90
> May  4 22:36:22 haswell kernel: [21948.150199] WARNING: stack going in the wrong direction? ip=intel_pmu_handle_irq+0xe/0x4a0
> 
> the last bit repeated for a few minutes (flooding the log with a few 
> thousand entries that look mostly similar)

Thanks.  I can recreate now, so I'll stop bugging you for a bit.  This
fuzzer is really good at finding unwinder issues.

-- 
Josh

  reply	other threads:[~2018-05-05 18:29 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-08 16:12 perf: perf_fuzzer quickly locks up on 4.15-rc7 Vince Weaver
2018-01-08 17:30 ` Ingo Molnar
2018-01-08 20:29   ` Vince Weaver
2018-01-09 10:25     ` Peter Zijlstra
2018-01-09 13:26       ` Peter Zijlstra
2018-01-09 13:36         ` Peter Zijlstra
2018-01-09 13:44         ` Vince Weaver
2018-01-09 15:12           ` Peter Zijlstra
2018-01-09 15:24             ` Vince Weaver
2018-01-09 15:33               ` Peter Zijlstra
2018-01-09 15:56                 ` Vince Weaver
2018-01-09 16:05                   ` Peter Zijlstra
2018-01-09 17:07                     ` Josh Poimboeuf
2018-01-11  5:25                       ` Josh Poimboeuf
2018-01-11 19:00                         ` Vince Weaver
2018-01-11 19:21                           ` Josh Poimboeuf
2018-01-11 19:50                             ` Peter Zijlstra
2018-01-11 19:57                               ` Vince Weaver
2018-01-11 20:43                                 ` Vince Weaver
2018-05-01 13:29                             ` perf: fuzzer causes stack going in wrong direction warnings Vince Weaver
2018-05-01 13:58                               ` Josh Poimboeuf
2018-05-01 19:59                                 ` Vince Weaver
2018-05-01 22:04                                   ` Josh Poimboeuf
2018-05-02 20:50                                     ` Josh Poimboeuf
2018-05-04 14:35                                       ` Vince Weaver
2018-05-04 16:25                                         ` Josh Poimboeuf
2018-05-04 17:00                                           ` Vince Weaver
2018-05-05 15:38                                           ` Vince Weaver
2018-05-05 18:29                                             ` Josh Poimboeuf [this message]
2018-05-06 23:49                                               ` Josh Poimboeuf
2018-05-10 13:48                                                 ` Peter Zijlstra
2018-05-10 14:27                                                   ` Josh Poimboeuf
2018-05-10 23:16                                                   ` Josh Poimboeuf
2018-01-09 16:16                 ` perf: perf_fuzzer quickly locks up on 4.15-rc7 Ingo Molnar
2018-01-09 16:20                   ` Peter Zijlstra
2018-01-09 17:18                 ` Vince Weaver
2018-01-10 15:28                   ` Vince Weaver
2018-01-09 16:14             ` Peter Zijlstra
2018-01-09 17:53               ` Steven Rostedt
2018-01-09 18:02                 ` Peter Zijlstra
2018-01-09 18:09                   ` Steven Rostedt
2018-01-09 19:53                     ` Peter Zijlstra
2018-01-11  9:13           ` Peter Zijlstra
2018-01-11 15:26             ` Vince Weaver
2018-01-11 15:38               ` Peter Zijlstra
2018-01-11 16:41                 ` Vince Weaver
2018-01-11 16:58                   ` Vince Weaver
2018-01-11 17:03                     ` Peter Zijlstra
2018-01-11 18:04                       ` Vince Weaver
2018-01-11 18:20                         ` Vince Weaver
2018-01-11 19:01                           ` Peter Zijlstra
2018-01-11 19:11                       ` Peter Zijlstra
2018-01-11 20:15                         ` Vince Weaver
2018-01-11 20:40                           ` Vince Weaver
2018-01-11 20:57                             ` Peter Zijlstra
2018-01-12 19:48                               ` Vince Weaver
2018-01-11 20:42                           ` Peter Zijlstra
2018-01-11 15:29             ` Peter Zijlstra

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