From fc551f8d4427150da1ee7cbb0f53525c49ef4bca Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Sat, 20 Oct 2012 13:08:46 -0300 Subject: [PATCH] perf trace: Check if sample raw_data field is set Sometimes we're segfaulting because we were expecting that the perf_sample.raw_data field was set as requested, but in some cases that needs further investigation, that field can be NULL, leading to segfaults. Make the tool more robust by checking that before calling any per event handlers that may try to use that field. Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Mike Galbraith Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-g1fmodl6ys4lq8honbj1igoi@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 83c6515e425d..7aaee39f6774 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -268,6 +268,13 @@ again: if (evlist->threads->map[0] == -1 || evlist->threads->nr > 1) printf("%d ", sample.tid); + if (sample.raw_data == NULL) { + printf("%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n", + perf_evsel__name(evsel), sample.tid, + sample.cpu, sample.raw_size); + continue; + } + handler = evsel->handler.func; handler(trace, evsel, &sample); }