linux-kernel - [BUG] perf probe can't insert return kprobe

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Message-ID: <20150109145539.GC14750@krava.brq.redhat.com>
Date:	Fri, 9 Jan 2015 15:55:39 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [BUG] perf probe can't insert return kprobe

hi,
I couldn't use following perf command to insert return probe:

  # perf probe -a fork_exit=do_fork%return
  Added new event:
  Failed to write event: Invalid argument
    Error: Failed to add events.


I'm pretty sure I used this command before, so seems like
it's broken. I can still use debugfs tracing interface to
do that:
  # echo 'r:do_fork_entry do_fork' > kprobe_events

I used Arnaldo's latest perf/core and FC20 kernel:

  # uname -a
  Linux krava 3.17.7-200.fc20.x86_64 #1 SMP Wed Dec 17 03:35:33 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  # ./perf version
  perf version 3.18.g6a7d78


thanks,
jirka
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