From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
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: Tue, 9 Jan 2018 11:07:16 -0600 [thread overview]
Message-ID: <20180109170716.bqmexpmywwr4bwuv@treble> (raw)
In-Reply-To: <20180109160551.GK3040@hirez.programming.kicks-ass.net>
On Tue, Jan 09, 2018 at 05:05:51PM +0100, Peter Zijlstra wrote:
> On Tue, Jan 09, 2018 at 10:56:52AM -0500, Vince Weaver wrote:
> > On Tue, 9 Jan 2018, Peter Zijlstra wrote:
> >
> > > So CONFIG_PAGE_TABLE_ISOLATION=y and booting with "pti=off" makes it
> > > 'work', right?
> >
> > yes. Previously I was changing CONFIG_PAGE_TABLE_ISOLATION and
> > recompiling, but just now I booted with it set to yes and pti=off and the
> > fuzzer has been running fine for a half hour (usually it crashes in under
> > 5 minutes).
> >
> > I did see these in the logs which I don't think I've seen before.
> >
> > WARNING: stack recursion on stack type 2
> > WARNING: can't dereference iret registers at 000000000783fea8 for ip paranoid_entry+0x2e/0x90
> > WARNING: can't dereference registers at 00000000f0698d17 for ip paranoid_entry+0x4c/0x90
> > WARNING: stack going in the wrong direction? ip=native_sched_clock+0x9/0x90
>
> I've seen that last one, but not the ones before. Josh, this isn't
> healty, right? :-)
Looks like some funky things may be happening on the stack there, though
we have seen some issues related to ORC getting confused by paravirt
patching. I'm a bit swamped at the moment but I'll look deeper as time
permits...
--
Josh
next prev parent reply other threads:[~2018-01-09 17:07 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-08 16:12 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 [this message]
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
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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