linux-kernel - Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

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Message-ID: <alpine.DEB.2.21.1801091215460.16446@macbook-air>
Date:   Tue, 9 Jan 2018 12:18:26 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

I tried it again with your patch and force_early_printk, no luck.

I can start dropping printks around the NMI code but I feel like I don't 
really know what I'm doing.

Also I managed to hit (presumably) the same bug on a skylake machine.  
That one doesn't have a serial cable hooked up to it, I'll try to see if I 
can find one.

I am running debian-unstable with gcc 7.2 if it makes a difference.

Vince