If parse_events__scanner() collects no entry, perf_evlist__last(evlist) is invalid. Then setting of cmdline_group_boundary touches invalid.
It could happend in currect BPF implementation. See [1]. Although it can be fixed, for safety reason it whould be better to introduce this check. Instead of checking number of entries, check data.list instead, so we can add dummy evsel here. [1]: http://lkml.kernel.org/n/1436445342-1402-19-git-send-email-wangn...@huawei.com Signed-off-by: Wang Nan <wangn...@huawei.com> Cc: Alexei Starovoitov <a...@plumgrid.com> Cc: Masami Hiramatsu <masami.hiramatsu...@hitachi.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Zefan Li <lize...@huawei.com> Cc: pi3or...@163.com Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Link: http://lkml.kernel.org/r/1440742821-44548-3-git-send-email-wangn...@huawei.com --- tools/perf/util/parse-events.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index d826e6f..14cd7e3 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -1143,10 +1143,14 @@ int parse_events(struct perf_evlist *evlist, const char *str, int entries = data.idx - evlist->nr_entries; struct perf_evsel *last; + if (!list_empty(&data.list)) { + last = list_entry(data.list.prev, + struct perf_evsel, node); + last->cmdline_group_boundary = true; + } + perf_evlist__splice_list_tail(evlist, &data.list, entries); evlist->nr_groups += data.nr_groups; - last = perf_evlist__last(evlist); - last->cmdline_group_boundary = true; return 0; } -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
