diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2024-10-10 22:52:35 +0200 |
|---|---|---|
| committer | Shuah Khan <skhan@linuxfoundation.org> | 2024-10-11 23:05:16 +0200 |
| commit | 4ee5ca9a29384fcf3f18232fdf8474166dea8dca (patch) | |
| tree | 04260a807277195acd8a1c9db09b0081c8a78f51 | |
| parent | selftests/rseq: Fix mm_cid test failure (diff) | |
| download | linux-4ee5ca9a29384fcf3f18232fdf8474166dea8dca.tar.xz linux-4ee5ca9a29384fcf3f18232fdf8474166dea8dca.zip | |
ftrace/selftest: Test combination of function_graph tracer and function profiler
Masami reported a bug when running function graph tracing then the
function profiler. The following commands would cause a kernel crash:
# cd /sys/kernel/tracing/
# echo function_graph > current_tracer
# echo 1 > function_profile_enabled
In that order. Create a test to test this two to make sure this does not
come back as a regression.
Link: https://lore.kernel.org/172398528350.293426.8347220120333730248.stgit@devnote2
Link: https://lore.kernel.org/all/20241010165235.35122877@gandalf.local.home/
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
| -rw-r--r-- | tools/testing/selftests/ftrace/test.d/ftrace/fgraph-profiler.tc | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-profiler.tc b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-profiler.tc new file mode 100644 index 000000000000..ffff8646733c --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-profiler.tc @@ -0,0 +1,31 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: ftrace - function profiler with function graph tracing +# requires: function_profile_enabled set_ftrace_filter function_graph:tracer + +# The function graph tracer can now be run along side of the function +# profiler. But there was a bug that caused the combination of the two +# to crash. It also required the function graph tracer to be started +# first. +# +# This test triggers that bug +# +# We need both function_graph and profiling to run this test + +fail() { # mesg + echo $1 + exit_fail +} + +echo "Enabling function graph tracer:" +echo function_graph > current_tracer +echo "enable profiler" + +# Older kernels do not allow function_profile to be enabled with +# function graph tracer. If the below fails, mark it as unsupported +echo 1 > function_profile_enabled || exit_unsupported + +# Let it run for a bit to make sure nothing explodes +sleep 1 + +exit 0 |