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Running both tests cases 126 128 together causes the first test case 126 to fail: # for i in $(seq 3); do ./perf test 'perf trace BTF general tests' \ 'perf trace record and replay'; done 126: perf trace BTF general tests : FAILED! 128: perf trace record and replay : Ok 126: perf trace BTF general tests : FAILED! 128: perf trace record and replay : Ok 126: perf trace BTF general tests : FAILED! 128: perf trace record and replay : Ok # Test case 126 fails because test case 128 runs concurrently as can be observed using a ps -ef | grep perf output list on a different window. Both do a perf trace command concurrently. Make test case 'perf trace BTF general tests' exclusive. Output after: # for i in $(seq 3); do ./perf test 'perf trace BTF general tests' \ 'perf trace record and replay'; done 127: perf trace BTF general tests : Ok 155: perf trace record and replay : Ok 127: perf trace BTF general tests : Ok 155: perf trace record and replay : Ok 127: perf trace BTF general tests : Ok 155: perf trace record and replay : Ok # Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by: Howard Chu <howardchu95@gmail.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>