perf test: Avoid python leak sanitizer test failures

Leak sanitizer will report memory leaks from python and the leak
sanitizer output causes tests to fail. For example:

  ```
  $ perf test 98 -v
   98: perf script tests:
  --- start ---
  test child forked, pid 1272962
  DB test
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.046 MB /tmp/perf-test-script.x0EktdCel8/perf.data (8 samples) ]
  call_path_table((1, 0, 0, 0)
  call_path_table((2, 1, 0, 140339508617447)
  call_path_table((3, 2, 2, 0)
  call_path_table((4, 3, 3, 0)
  call_path_table((5, 4, 4, 0)
  call_path_table((6, 5, 5, 0)
  call_path_table((7, 6, 6, 0)
  call_path_table((8, 7, 7, 0)
  call_path_table((9, 8, 8, 0)
  call_path_table((10, 9, 9, 0)
  call_path_table((11, 10, 10, 0)
  call_path_table((12, 11, 11, 0)
  call_path_table((13, 12, 1, 0)
  sample_table((1, 1, 1, 1, 1, 1, 1, 8, -2058824120, 588306954119000, -1, 0, 0, 0, 0, 1, 0, 0, 128933429281, 0, 0, 13, 0, 0, 0, -1, -1))
  sample_table((2, 1, 1, 1, 1, 1, 1, 8, -2058824120, 588306954137053, -1, 0, 0, 0, 0, 1, 0, 0, 128933429281, 0, 0, 13, 0, 0, 0, -1, -1))
  sample_table((3, 1, 1, 1, 1, 1, 1, 8, -2058824120, 588306954140089, -1, 0, 0, 0, 0, 9, 0, 0, 128933429281, 0, 0, 13, 0, 0, 0, -1, -1))
  sample_table((4, 1, 1, 1, 1, 1, 1, 8, -2058824120, 588306954142376, -1, 0, 0, 0, 0, 155, 0, 0, 128933429281, 0, 0, 13, 0, 0, 0, -1, -1))
  sample_table((5, 1, 1, 1, 1, 1, 1, 8, -2058824120, 588306954144045, -1, 0, 0, 0, 0, 2493, 0, 0, 128933429281, 0, 0, 13, 0, 0, 0, -1, -1))
  sample_table((6, 1, 1, 1, 1, 1, 12, 77, -2046828595, 588306954145722, -1, 0, 0, 0, 0, 47555, 0, 0, 128933429281, 0, 0, 13, 0, 0, 0, -1, -1))
  call_path_table((14, 9, 14, 0)
  call_path_table((15, 14, 15, 0)
  call_path_table((16, 15, 0, -1040969624)
  call_path_table((17, 16, 16, 0)
  call_path_table((18, 17, 17, 0)
  call_path_table((19, 18, 18, 0)
  call_path_table((20, 19, 19, 0)
  call_path_table((21, 20, 13, 0)
  sample_table((7, 1, 1, 1, 2, 1, 13, 46, -2053700898, 588306954157436, -1, 0, 0, 0, 0, 964078, 0, 0, 128933429281, 0, 0, 21, 0, 0, 0, -1, -1))
  call_path_table((22, 1, 21, 0)
  call_path_table((23, 22, 22, 0)
  call_path_table((24, 23, 23, 0)
  call_path_table((25, 24, 24, 0)
  call_path_table((26, 25, 25, 0)
  call_path_table((27, 26, 26, 0)
  call_path_table((28, 27, 27, 0)
  call_path_table((29, 28, 28, 0)
  call_path_table((30, 29, 29, 0)
  call_path_table((31, 30, 30, 0)
  call_path_table((32, 31, 31, 0)
  call_path_table((33, 32, 32, 0)
  call_path_table((34, 33, 33, 0)
  call_path_table((35, 34, 20, 0)
  sample_table((8, 1, 1, 1, 2, 1, 20, 49, -2046878127, 588306954378624, -1, 0, 0, 0, 0, 2534317, 0, 0, 128933429281, 0, 0, 35, 0, 0, 0, -1, -1))

  =================================================================
  ==1272975==ERROR: LeakSanitizer: detected memory leaks

  Direct leak of 13628 byte(s) in 6 object(s) allocated from:
      #0 0x56354f60c092 in malloc (/tmp/perf/perf+0x29c092)
      #1 0x7ff25c7d02e7 in _PyObject_Malloc /build/python3.11/../Objects/obmalloc.c:2003:11
      #2 0x7ff25c7d02e7 in _PyObject_Malloc /build/python3.11/../Objects/obmalloc.c:1996:1

  SUMMARY: AddressSanitizer: 13628 byte(s) leaked in 6 allocation(s).
  --- Cleaning up ---
  ---- end(-1) ----
   98: perf script tests                                               : FAILED!
  ```

Disable leak sanitizer when running specific perf+python tests to
avoid this. This causes the tests to pass when run with leak
sanitizer.
Reviewed-by: Aditya Gupta <adityag@linux.ibm.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/script.sh

@@ -61,7 +61,10 @@ _end_of_file_
 	esac
 
 	perf record $cmd_flags -o "${perfdatafile}" true
+	# Disable lsan to avoid warnings about python memory leaks.
+	export ASAN_OPTIONS=detect_leaks=0
 	perf script -i "${perfdatafile}" -s "${db_test}"
+	export ASAN_OPTIONS=
 	echo "DB test [Success]"
 }
 

tools/perf/tests/shell/test_task_analyzer.sh

@@ -11,6 +11,9 @@ if [ -e "$perfdir/scripts/python/Perf-Trace-Util" ]; then
   export PERF_EXEC_PATH=$perfdir
 fi
 
+# Disable lsan to avoid warnings about python memory leaks.
+export ASAN_OPTIONS=detect_leaks=0
+
 cleanup() {
   rm -f perf.data
   rm -f perf.data.old