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From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
	Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org, yrl.pp-manager.tt@hitachi.com,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@redhat.com>,
	"Frank Ch. Eigler" <fche@redhat.com>
Subject: Re: [PATCH 1/4] [BUGFIX] ftrace/kprobes: Fix not to delete probes if in use
Date: Sat, 08 Oct 2011 01:00:04 -0400
Message-ID: <1318050006.4729.103.camel@gandalf.stny.rr.com> (raw)
In-Reply-To: <20111004104438.14591.6553.stgit@fedora15>

On Tue, 2011-10-04 at 19:44 +0900, Masami Hiramatsu wrote:
> Fix kprobe-tracer not to delete a probe if the probe is in use.
> In that case, delete operation will return -EBUSY.
> 
> This bug can cause a kernel panic if enabled probes are deleted
> during perf record.
> 
> (Add some probes on functions)
> # perf record -e probe:\* -aR sh
> sh-4.2# perf probe --del probe:\*
> sh-4.2# exit
> (kernel panic)


Hi Masami,

I was able to reproduce the panic. I'm currently running patch 1 and 4
through my standard tests before pushing this out as urgent.

Does this exist in previous kernels? If so, I'll also add the stable tag
to it.

Could you resend the trivial patches when you make your necessary
corrections. They are not important as these are and I'll add them to a
separate queue.

Thanks!

-- Steve



  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-04 10:44 Masami Hiramatsu
2011-10-04 10:44 ` [PATCH 2/4] [TRIVIAL] ftrace/kprobes: Fix an warning typo Masami Hiramatsu
2011-10-04 15:58   ` Valdis.Kletnieks
2011-10-05  4:08     ` Masami Hiramatsu
2011-10-04 10:44 ` [PATCH 3/4] [TRIVIAL] perftools: Fix a typo of command name as trace-cmd Masami Hiramatsu
2011-10-04 10:45 ` [PATCH 4/4] [BUGFIX] perf probe: Fix to show correct error string Masami Hiramatsu
2011-10-08  5:00 ` Steven Rostedt [this message]
2011-10-10 14:14   ` [PATCH 1/4] [BUGFIX] ftrace/kprobes: Fix not to delete probes if in use Masami Hiramatsu
2011-10-10 19:11     ` Steven Rostedt

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