[PATCH 4.17 116/324] perf tests: Add event parsing error handling to parse events test

Greg Kroah-Hartman
2018-08-23T08:49:35Z

From: Jiri Olsa <jolsa@kernel.org>

[ Upstream commit 933ccf2002aaef1037cb676622a694f5390c3d59 ]

Add missing error handling for parse_events calls in test_event function
that led to following segfault on s390:

running test 52 'intel_pt//u'
perf: Segmentation fault
...
/lib64/libc.so.6(vasprintf+0xe6) [0x3fffca3f106]
/lib64/libc.so.6(asprintf+0x46) [0x3fffca1aa96]
./perf(parse_events_add_pmu+0xb8) [0x80132088]
./perf(parse_events_parse+0xc62) [0x8019529a]
./perf(parse_events+0x98) [0x801341c0]
./perf(test__parse_events+0x48) [0x800cd140]
./perf(cmd_test+0x26a) [0x800bd44a]
test child interrupted

Adding the struct parse_events_error argument to parse_events call. Also
adding parse_events_print_error to get more details on the parsing
failures, like:

# perf test 6 -v
running test 52 'intel_pt//u'failed to parse event 'intel_pt//u', err 1, str 'Cannot find PMU `intel_pt'. Missing kernel support?'
event syntax error: 'intel_pt//u'
\___ Cannot find PMU `intel_pt'. Missing kernel support?

Committer note:

Use named initializers in the struct parse_events_error variable to
avoid breaking the build on centos5, 6 and others with a similar gcc:

cc1: warnings being treated as errors
tests/parse-events.c: In function 'test_event':
tests/parse-events.c:1696: error: missing initializer
tests/parse-events.c:1696: error: (near initialization for 'err.str')

Reported-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kim Phillips <kim.phillips@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: http://lkml.kernel.org/r/20180611093422.1005-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
tools/perf/tests/parse-events.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -1672,6 +1672,7 @@ static struct terms_test test__terms[] =

static int test_event(struct evlist_test *e)
{
+ struct parse_events_error err = { .idx = 0, };
struct perf_evlist *evlist;
int ret;

@@ -1679,10 +1680,11 @@ static int test_event(struct evlist_test
if (evlist == NULL)
return -ENOMEM;

- ret = parse_events(evlist, e->name, NULL);
+ ret = parse_events(evlist, e->name, &err);
if (ret) {
- pr_debug("failed to parse event '%s', err %d\n",
- e->name, ret);
+ pr_debug("failed to parse event '%s', err %d, str '%s'\n",
+ e->name, ret, err.str);
+ parse_events_print_error(&err, e->name);
} else {
ret = e->check(evlist);
}