From: Peter Zijlstra <peterz@infradead.org>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Andy Lutomirski <luto@kernel.org>
Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7
Date: Thu, 11 Jan 2018 20:50:18 +0100 [thread overview]
Message-ID: <20180111195018.GB3397@worktop> (raw)
In-Reply-To: <20180111192112.d35nkotzklicd27c@treble>
On Thu, Jan 11, 2018 at 01:21:12PM -0600, Josh Poimboeuf wrote:
> Yuck. This time it was stack recursion on the entry stack. In the
> previous error, recursion was detected on the IRQ stack. Otherwise they
> look quite similar.
>
> Was that also with nopti?
Both with pti enabled, nopti makes things work again.
> I haven't had a chance to try it yet, any idea if these would be
> recreatable in a VM?
Good question; typically we run the perf fuzzer on read hardware because
the PMU doesn't virtualize much. But if software perf is enough to
trigger this, that would certainly help.
next prev parent reply other threads:[~2018-01-11 19:50 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 [this message]
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
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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