linux-kernel - Re: perf/tracepoint: another fuzzer generated lockup

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Message-ID: <20131117094320.GN16796@laptop.programming.kicks-ass.net>
Date:	Sun, 17 Nov 2013 10:43:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Dave Jones <davej@...hat.com>
Subject: Re: perf/tracepoint: another fuzzer generated lockup

On Sun, Nov 17, 2013 at 04:53:59PM +0900, Masami Hiramatsu wrote:
> Agreed.
> FYI, kprobes has a recursion detection counter and it is reported via
> debugfs/tracing/kprobe_profile :)

Perf also has a recursion counter (4 actually, not reported to
userspace), but the problem with the irq_work_exit thing is that its a
non-recursive event loop, so recursion checks don't actually work to
catch it.
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