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Subject[PATCH 0/3] tracing: Fix bugs on snapshot feature

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/ | 28 ++++++++++++++++++++
6 files changed, 60 insertions(+), 4 deletions(-)
create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/

Masami Hiramatsu (Linaro) <>
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