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#!/bin/bash
# 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 $0)"/lib/probe.sh
skip_if_no_perf_trace || exit 2
[ "$(id -u)" = 0 ] || 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
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