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

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Date:   Tue, 1 May 2018 09:29:38 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
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: perf: fuzzer causes stack going in wrong direction warnings

Hello

I reported this back in January, but I think it got lost since everyone 
was busy with other more pressing matters.

But in any case, the perf_fuzzer still can trigger these type of messages 
and just wanted to see if they were a cause for concern, or just noise.

[66620.496076] WARNING: can't dereference registers at 0000000051f78a40 for ip interrupt_entry+0xba/0xc0
[66620.506117] WARNING: stack recursion on stack type 4
[67126.898984] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xd/0x90
[67148.214712] WARNING: can't dereference iret registers at 00000000c8f3c864 for ip error_exit+0x20/0x20

Vince