Merge #16236: fuzz: Log output even if fuzzer failed

fa410f67aa test: Suppress false positive leak in secure_allocator<RNGState> (MarcoFalke)
fa35c4239f test: Log output even if fuzzer failed (MarcoFalke)

Pull request description:

  Also suppress a false positive detected leak

ACKs for commit fa410f:
  practicalswift:
    utACK fa410f67aa

Tree-SHA512: 224a72ae0dd9bbe7debda17cd626c01cfbd0e45d7df47a2b591ce8ea386951ad94f4c0677dd268079a4caac382c5acac03199146015a95c308a633e9e4f84c09

test/fuzz/test_runner.py

@@ -106,8 +106,10 @@ def run_once(*, corpus, test_list, build_dir, export_coverage):
             os.path.join(corpus, t),
         ]
         logging.debug('Run {} with args {}'.format(t, args))
-        output = subprocess.run(args, check=True, stderr=subprocess.PIPE, universal_newlines=True).stderr
+        result = subprocess.run(args, stderr=subprocess.PIPE, universal_newlines=True)
+        output = result.stderr
         logging.debug('Output: {}'.format(output))
+        result.check_returncode()
         if not export_coverage:
             continue
         for l in output.splitlines():

test/sanitizer_suppressions/lsan

@@ -4,3 +4,6 @@ leak:libqminimal
 leak:libQt5Core
 leak:libQt5Gui
 leak:libQt5Widgets
+
+# false-positive due to use of secure_allocator<>
+leak:GetRNGState