netdev - [PATCH bpf-next] selftests/bpf: Fix spurious failures in accept due to EAGAIN

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Date:   Thu, 12 Mar 2020 18:11:05 +0100
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, kernel-team@...udflare.com,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: [PATCH bpf-next] selftests/bpf: Fix spurious failures in accept due to EAGAIN

Andrii Nakryiko reports that sockmap_listen test suite is frequently
failing due to accept() calls erroring out with EAGAIN:

  ./test_progs:connect_accept_thread:733: accept: Resource temporarily unavailable
  connect_accept_thread:FAIL:733

This is because we are needlessly putting the listening TCP sockets in
non-blocking mode.

Fix it by using the default blocking mode in all tests in this suite.

Fixes: 44d28be2b8d4 ("selftests/bpf: Tests for sockmap/sockhash holding listening sockets")
Reported-by: Andrii Nakryiko <andrii.nakryiko@...il.com>
Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 tools/testing/selftests/bpf/prog_tests/sockmap_listen.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c b/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
index 52aa468bdccd..90271ec90388 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
@@ -754,7 +754,7 @@ static void test_syn_recv_insert_delete(int family, int sotype, int mapfd)
 	int err, s;
 	u64 value;
 
-	s = socket_loopback(family, sotype | SOCK_NONBLOCK);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -896,7 +896,7 @@ static void redir_to_connected(int family, int sotype, int sock_mapfd,
 
 	zero_verdict_count(verd_mapfd);
 
-	s = socket_loopback(family, sotype | SOCK_NONBLOCK);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -1028,7 +1028,7 @@ static void redir_to_listening(int family, int sotype, int sock_mapfd,
 
 	zero_verdict_count(verd_mapfd);
 
-	s = socket_loopback(family, sotype | SOCK_NONBLOCK);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
-- 
2.24.1