perf script: Skip aggregation for stat events

The script command does not support aggregation modes by itself although
that can be achieved using post-processing scripts. Because of this, it
does not allocate memory for aggregated event values.

Upon running perf stat record, the aggregation mode is set in the perf
data file. If the mode is AGGR_GLOBAL, the aggregated event values are
accessed and this leads to a segmentation fault since these were never
allocated to begin with. Set the mode to AGGR_NONE explicitly to avoid
this.

E.g.

  $ perf stat record -e cycles true
  $ perf script

Before:
  Segmentation fault (core dumped)

After:
  CPU   THREAD             VAL             ENA             RUN            TIME EVENT
   -1   231919          162831          362069          362069          935289 cycles:u

Fixes: 8b76a31 ("perf stat: Remove unused perf_counts.aggr field")
Signed-off-by: Sandipan Das <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ananth Narayan <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: [email protected] # v6.2+
Link: https://lore.kernel.org/r/83d6c6c05c54bf00c5a9df32ac160718efca0c7a.1683280603.git.sandipan.das@amd.com
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: sandip4n

tools/perf/builtin-script.c

@@ -3647,6 +3647,13 @@ static int process_stat_config_event(struct perf_session *session __maybe_unused
 				     union perf_event *event)
 {
 	perf_event__read_stat_config(&stat_config, &event->stat_config);
+
+	/*
+	 * Aggregation modes are not used since post-processing scripts are
+	 * supposed to take care of such requirements
+	 */
+	stat_config.aggr_mode = AGGR_NONE;
+
 	return 0;
 }