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Message-ID: <alpine.DEB.2.10.1404171131580.22226@vincent-weaver-1.um.maine.edu> Date: Thu, 17 Apr 2014 11:35:45 -0400 (EDT) From: Vince Weaver <vincent.weaver@...ne.edu> To: Peter Zijlstra <peterz@...radead.org> cc: Vince Weaver <vincent.weaver@...ne.edu>, Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [perf] more perf_fuzzer memory corruption On Thu, 17 Apr 2014, Peter Zijlstra wrote: > > Meh.. my machine keeps locking up with 15-rc1 and your fuzzer. It looks > to get stuck a finish_task_switch() from a preemption while waiting for > a perf IPI. > > Which is complete crack because we have preemption disabled over > issueing and waiting for the IPI :/ > > I tried reverting some of the IPI related patches, but no joy so far, > I'm about to go try a git-bisect on this. Bisecting can be a pain, as if you go too far back you start running into other bugs that have been fixed due to the fuzzer. Over the past year there's been at least 10 perf_fuzzer-related crash fixes that have gotten into the kernel. It used to be I could crash things in seconds, it's now up to minutes-hours but the bugs are that much harder to isolate :( And I still am not fuzzing with signal-overflow enabled, which causes even more pain. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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