From: Vince Weaver <vincent.weaver@maine.edu>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
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 14:00:27 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.21.1801111358580.22460@macbook-air> (raw)
In-Reply-To: <20180111052538.2qhj6oxnc24xumhk@treble>
On Wed, 10 Jan 2018, Josh Poimboeuf wrote:
> For the crash, you might try enabling CONFIG_DEBUG_ENTRY and seeing if
> that gives you any output.
I did enable that, didn't seem to help on the haswell machien at least.
> > > > 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
>
> This all looks very weird. The stack pointers -- 000000000783fea8 and
> 00000000f0698d17 -- are obviously very wrong. I will try to recreate
> locally.
On a related note, on a core2 machine with the perf_fuzzer I got this too:
Jan 11 13:44:01 core2 kernel: [ 1078.931403] WARNING: stack recursion on stack type 4
Jan 11 13:44:01 core2 kernel: [ 1078.931411] WARNING: can't dereference registers at 000000002c6beb99 for ip swapgs_restore_regs_and_return_to_usermode+0x2b/0x7c
Vince
next prev parent reply other threads:[~2018-01-11 19:00 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 [this message]
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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