This series fixes a kernel oops when an ftrace instance is deleted while
there are still active event triggers. Patch 2 provides details on how
to reproduce as well as the kernel oops message.
This issue was reported by Michael Ellerman as a crash seen when trying
to run the ftrace test suite. In looking into it, I noticed that the
issue actually showed up due to a few bashisms in the ftrace tests when
run on Ubuntu. Those bashisms meant that the ftrace instance was being
deleted without removing the event triggers. Patch 3 includes a fix for
the bashisms.
Patch 4 adds a test case to explicitly catch this issue going forward.
- Naveen
Naveen N. Rao (4):
ftrace: Simplify glob handling in
unregister_ftrace_function_probe_func()
ftrace/instances: Clear function triggers when removing instances
selftests/ftrace: Fix bashisms
selftests/ftrace: Add test to remove instance with active event
triggers
kernel/trace/ftrace.c | 12 ++++++++++--
kernel/trace/trace.c | 1 +
kernel/trace/trace.h | 1 +
tools/testing/selftests/ftrace/ftracetest | 2 +-
.../selftests/ftrace/test.d/ftrace/func_event_triggers.tc | 2 +-
tools/testing/selftests/ftrace/test.d/functions | 4 ++--
.../selftests/ftrace/test.d/instances/instance-event.tc | 8 ++++++--
7 files changed, 22 insertions(+), 8 deletions(-)
--
2.12.2
