[PATCH v1 net 2/2] selftest: af_unix: Add test case with mixed lowpoint in scm_rights.c.

The new test case creates two SCCs so that each of them
has multiple scc_index.

Without patch, GC cannot free the sockets and the test fails.

  #  RUN           scm_rights.dgram.mixed_lowpoints ...
  # scm_rights.c:176:mixed_lowpoints:Expected 0 (0) == ret (12)
  # mixed_lowpoints: Test terminated by assertion
  #          FAIL  scm_rights.dgram.mixed_lowpoints
  not ok 5 scm_rights.dgram.mixed_lowpoints
  ...
  # FAILED: 45 / 50 tests passed.
  # Totals: pass:45 fail:5 xfail:0 xpass:0 skip:0 error:0

With the patch, all tests pass.

  # PASSED: 50 / 50 tests passed.
  # Totals: pass:50 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 .../testing/selftests/net/af_unix/scm_rights.c  | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/net/af_unix/scm_rights.c b/tools/testing/selftests/net/af_unix/scm_rights.c
index d82a79c21c17..c165f250220a 100644
--- a/tools/testing/selftests/net/af_unix/scm_rights.c
+++ b/tools/testing/selftests/net/af_unix/scm_rights.c

@@ -378,4 +378,21 @@ TEST_F(scm_rights, backtrack_from_scc)
 	close_sockets(10);
 }
 
+TEST_F(scm_rights, mixed_lowpoint)
+{
+	create_sockets(6);
+
+	send_fd(0, 1);
+	send_fd(1, 2);
+	send_fd(2, 1);
+	send_fd(1, 0);
+
+	send_fd(3, 4);
+	send_fd(4, 5);
+	send_fd(5, 4);
+	send_fd(4, 3);
+
+	close_sockets(6);
+}
+
 TEST_HARNESS_MAIN

-- 
2.55.0.1007.g17ff1f9808-goog