[PATCH] selftest: memcg: Skp memcg_sock test if address family not supported

Waiman Long
2026-03-09T16:03:03Z

On systems where IPv6 isn't enabled or not configured to support
SOCK_STREAM, the test_memcg_sock test always fails. The purpose
of the test_memcg_sock test is to verify that memory.stat.sock and
memory.current values are close. If the socket() call fails, there is
no way we can test that. I believe it is better to just skip the test
in this case instead of reporting a test failure hinting that there
may be something wrong with the memcg code.

Fixes: 5f8f019380b8 ("selftests: cgroup/memcontrol: add basic test for socket accounting")
Signed-off-by: Waiman Long <longman@redhat.com>
---
tools/testing/selftests/cgroup/test_memcontrol.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 2fb096a2a9f9..3c13ef67fafb 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -1280,8 +1280,11 @@ static int tcp_server(const char *cgroup, void *arg)
saddr.sin6_port = htons(srv_args->port);

sk = socket(AF_INET6, SOCK_STREAM, 0);
- if (sk < 0)
+ if (sk < 0) {
+ /* Pass back errno to the ctl_fd */
+ write(ctl_fd, &errno, sizeof(errno));
return ret;
+ }

if (setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
goto cleanup;
@@ -1414,6 +1417,9 @@ static int test_memcg_sock(const char *root)

if (!err)
break;
+ if (err == EAFNOSUPPORT)
+ /* Skip if address family not supported by protocol */
+ goto skip;
if (err != EADDRINUSE)
goto cleanup;

@@ -1460,6 +1466,9 @@ static int test_memcg_sock(const char *root)
free(memcg);

return ret;
+skip:
+ ret = KSFT_SKIP;
+ goto cleanup;
}

/*
--
2.53.0