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Date: Fri, 12 Jul 2013 21:40:19 -0400 (EDT) From: Vince Weaver <vince@...ter.net> To: Dave Jones <davej@...hat.com> cc: Dave Hansen <dave.hansen@...el.com>, Ingo Molnar <mingo@...nel.org>, Markus Trippelsdorf <markus@...ppelsdorf.de>, Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel <linux-kernel@...r.kernel.org>, Peter Anvin <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>, Dave Hansen <dave.hansen@...ux.intel.com> Subject: Re: Yet more softlockups. On Fri, 12 Jul 2013, Dave Jones wrote: > > Here's a fun trick: > > trinity -c perf_event_open -C4 -q -l off > > Within about a minute, that brings any of my boxes to its knees. > The softlockup detector starts going nuts, and then the box wedges solid. are you running with the patch [PATCH 1/2] perf: Clone child context from parent context pmu https://lkml.org/lkml/2013/7/9/310 It hasn't hit Linus git yet. It fixes a bug that my perf_fuzzer would hit within seconds but it took me over a month of trace bisecting and kernel bisecting to isolate it. The symptoms were stuck processes and NMI tracebacks leading to hard locks. With the patch applied my perf_fuzzer (which uses the same perf_event_open syscall generator as trinity) runs for hours w/o problems. 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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