linux-kernel - Re: [PATCH 02/11] [BUGFIX] ftrace, kprobes: Fix a deadlock on ftrace_regex

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Message-ID: <1368114064.7373.109.camel@gandalf.local.home>
Date:	Thu, 09 May 2013 11:41:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	linux-kernel@...r.kernel.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	yrl.pp-manager.tt@...achi.com, Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Tom Zanussi <tom.zanussi@...el.com>
Subject: Re: [PATCH 02/11] [BUGFIX] ftrace, kprobes: Fix a deadlock on
 ftrace_regex_lock

On Thu, 2013-05-09 at 10:47 -0400, Steven Rostedt wrote:

> > sh-2.05b# echo p vfs_symlink > kprobe_events
> > sh-2.05b# echo vfs_symlink:enable_event:kprobes:p_vfs_symlink_0 > set_ftrace_filter
> > 

> Ouch! I'm surprised I didn't trigger this in my tests. I have lockdep
> enabled, and I did run kprobe testing. I'll have to look at how this was
> missed :-/

OK, now I know why I missed this. My tests never enabled a kprobe event.
I'll have to update them to do so.

Thanks,

-- Steve


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