1 files changed, 51 insertions, 0 deletions
diff --git a/tools/perf/tests/shell/trace_exit_race.sh b/tools/perf/tests/shell/trace_exit_race.sh
new file mode 100755
index 000000000000..fbb0adc33a88
--- /dev/null
+++ b/tools/perf/tests/shell/trace_exit_race.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+# perf trace exit race
+# SPDX-License-Identifier: GPL-2.0
+
+# Check that the last events of a perf trace'd subprocess are not
+# lost. Specifically, trace the exiting syscall of "true" 10 times and ensure
+# the output contains 10 correct lines.
+
+# shellcheck source=lib/probe.sh
+. "$(dirname $0)"/lib/probe.sh
+
+skip_if_no_perf_trace || exit 2
+
+if [ "$1" = "-v" ]; then
+	verbose="1"
+fi
+
+iter=10
+regexp=" +[0-9]+\.[0-9]+ [0-9]+ syscalls:sys_enter_exit_group\(\)$"
+
+trace_shutdown_race() {
+	for _ in $(seq $iter); do
+		perf trace --no-comm -e syscalls:sys_enter_exit_group true 2>>$file
+	done
+	result="$(grep -c -E "$regexp" $file)"
+	[ $result = $iter ]
+}
+
+
+file=$(mktemp /tmp/temporary_file.XXXXX)
+
+# Do not use whatever ~/.perfconfig file, it may change the output
+# via trace.{show_timestamp,show_prefix,etc}
+export PERF_CONFIG=/dev/null
+
+trace_shutdown_race
+err=$?
+
+if [ $err != 0 ] && [ "${verbose}" = "1" ]; then
+	lines_not_matching=$(mktemp /tmp/temporary_file.XXXXX)
+	if grep -v -E "$regexp" $file > $lines_not_matching ; then
+		echo "Lines not matching the expected regexp: '$regexp':"
+		cat $lines_not_matching
+	else
+		echo "Missing output, expected $iter but only got $result"
+	fi
+	rm -f $lines_not_matching
+fi
+
+rm -f ${file}
+exit $err