linux-kernel - Re: perf: fuzzer causes stack going in wrong direction warnings

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Message-ID: <20180501220458.p3rgwzh3jcqt4jmm@treble>
Date:   Tue, 1 May 2018 17:04:58 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Vince Weaver <vincent.weaver@...ne.edu>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: perf: fuzzer causes stack going in wrong direction warnings

On Tue, May 01, 2018 at 03:59:31PM -0400, Vince Weaver wrote:
> On Tue, 1 May 2018, Josh Poimboeuf wrote:
> 
> > Can you try the following patch?
> 
> I applied the patch, but the warnings don't really look that different.
> 
> [   62.220322] WARNING: stack recursion on stack type 4
> [   62.220326] WARNING: can't dereference registers at 000000009ca2e86d for ip swapgs_restore_regs_and_return_to_usermode+0x79/0x87
> [  367.597013] WARNING: stack going in the wrong direction? ip=native_sched_clock+0x9/0x90

Bummer.  I'll need to come up with a patch to dump more info.

-- 
Josh