linux-kernel - [PATCH 0/3] tracing: Fix bugs on snapshot feature

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Message-Id: <153149923649.11274.14970833360963898112.stgit@devbox>
Date:   Sat, 14 Jul 2018 01:27:17 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Hiraku Toyooka <hiraku.toyooka@...ertrust.co.jp>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] tracing: Fix bugs on snapshot feature

Hi,

Here is 2 bugfixes and 1 testcase related to ftrace snapshot
feature. The 1st one is a double free bug and happens very rare.
It happened on my pc when I was cleaning up ftracetest
(but not reproducible). Anyway, it was easy to find the root
cause because I had a backtrace.
The 2nd one is an odd behavior of snapshotting. Since it is
easy to reproduce, I made a kselftest testcase for this bug too.

Thank you,

---

Masami Hiramatsu (3):
      [BUGFIX] tracing: Fix double free of event_trigger_data
      [BUGFIX] ring_buffer: tracing: Inherit the tracing setting to next ring buffer
      selftests/ftrace: Add snapshot and tracing_on test case


 include/linux/ring_buffer.h                        |    1 +
 kernel/trace/ring_buffer.c                         |   12 +++++++++
 kernel/trace/trace.c                               |   11 ++++++++
 kernel/trace/trace.h                               |    2 +
 kernel/trace/trace_events_trigger.c                |   10 ++++---
 .../selftests/ftrace/test.d/00basic/snapshot.tc    |   28 ++++++++++++++++++++
 6 files changed, 60 insertions(+), 4 deletions(-)
 create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc

--
Masami Hiramatsu (Linaro) <mhiramat@...nel.org>