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ftrace/selftest: Test combination of function_graph tracer and function profiler

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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>
This commit is contained in:
Steven Rostedt 2024-10-10 16:52:35 -04:00 committed by Shuah Khan
parent a0cc649353
commit 4ee5ca9a29
1 changed files with 31 additions and 0 deletions
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31
tools/testing/selftests/ftrace/test.d/ftrace/fgraph-profiler.tc Normal file
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#!/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