linux-kernel - Re: NULL ptr deref in perf/filter

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Date:	Mon, 8 Aug 2016 16:07:05 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Vegard Nossum <vegard.nossum@...il.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	David Carrillo-Cisneros <davidcc@...gle.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Kan Liang <kan.liang@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: NULL ptr deref in perf/filter_match

On Thu, 4 Aug 2016, Vegard Nossum wrote:
> BTW, this seems to show up slightly more frequently although I've seen
> it a couple of times before without your patch too so it's probably
> unrelated:
> 
> WARNING: CPU: 0 PID: 1244 at arch/x86/kernel/hw_breakpoint.c:121
> arch_install_hw_breakpoint+0x284/0x2f0
> Can't find any breakpoint slot

are you using perf_fuzzer to find these bugs or some other tool?

The "Can't find any breakpoint slot" warning dates back years, and there 
have been a few attempts to fix it but it's never gone away.

Vince