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Date: Fri, 16 Jan 2015 13:54:09 -0500 (EST) From: Vince Weaver <vince@...ter.net> To: Peter Zijlstra <peterz@...radead.org> cc: Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>, Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org, mark.rutland@....com, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: perf fuzzer crash [PATCH] perf: Get group events reference before moving the group On Fri, 16 Jan 2015, Peter Zijlstra wrote: > On Fri, Jan 16, 2015 at 11:46:44AM +0100, Peter Zijlstra wrote: > > Its a bandaid at best :/ The problem is (again) that we changes > > event->ctx without any kind of serialization. > > > > The issue came up before: > > > > https://lkml.org/lkml/2014/9/5/397 > > > > and I've not been able to come up with anything much saner. > > A little something like the below is the best I could come up with; I > know Linus hated it, but I figure we ought to do something to stop > crashing. I just wanted to report that I've tested both this patch and Jiri's original one and they both keep my easy-to-trigger-testcase from crashing my core2 machine (when applied against 3.18). This is great! I've been chasing this bug for months. 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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