# ./perf trace -e sched:sched_switch -G test -a sleep 1
perf: Segmentation fault
Obtained 11 stack frames.
./perf(sighandler_dump_stack+0x43) [0x55cfdc636db3]
/lib/x86_64-linux-gnu/libc.so.6(+0x3efcf) [0x7fd23eecafcf]
./perf(parse_cgroups+0x36) [0x55cfdc673f36]
./perf(+0x3186ed) [0x55cfdc70d6ed]
./perf(parse_options_subcommand+0x629) [0x55cfdc70e999]
./perf(cmd_trace+0x9c2) [0x55cfdc5ad6d2]
./perf(+0x1e8ae0) [0x55cfdc5ddae0]
./perf(+0x1e8ded) [0x55cfdc5ddded]
./perf(main+0x370) [0x55cfdc556f00]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe6) [0x7fd23eeadb96]
./perf(_start+0x29) [0x55cfdc557389]
Segmentation fault
It happens because "struct trace" in option->value is passed to
parse_cgroups function instead of "struct evlist".
Signed-off-by: Stanislav Ivanichkin <sivanich...@yandex-team.ru>
Reviewed-by: Dmitry Monakhov <dmtrmonak...@yandex-team.ru>
---
tools/perf/builtin-trace.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index bea461b6f937..cbc4de6840db 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -4651,9 +4651,12 @@ static int trace__parse_cgroups(const struct option
*opt, const char *str, int u
{
struct trace *trace = opt->value;
- if (!list_empty(&trace->evlist->core.entries))
- return parse_cgroups(opt, str, unset);
-
+ if (!list_empty(&trace->evlist->core.entries)) {
+ struct option o = OPT_CALLBACK('G', "cgroup", &trace->evlist,
+ "name", "monitor event in cgroup name only",
+ parse_cgroups);
+ return parse_cgroups(&o, str, unset);
+ }
trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);
return 0;
--
2.17.1
