csum.c binds a socket on a fixed port in init_net to test the csum offload feature between two machines. In our testbed, the test sometimes fails with -EADDRINUSE. bind r: Address already in use bind dgram 6: Address already in use The fixed ports (33000, 33001, 34000) are all within the default ip_local_ports range (32768 ~ 60999), and other processes may happen to be using them. Let's use ports outside of the default ip_local_ports range to deflake the test. # cat /etc/services | grep -E "(13000|13001|13002)" | echo no service no service # rpm -qf /etc/services setup-2.15.0-28.fc44.noarch We could add an option to specify ports if needed. Suggested-by: Mahesh Bandewar Signed-off-by: Kuniyuki Iwashima --- tools/testing/selftests/net/lib/csum.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/net/lib/csum.c b/tools/testing/selftests/net/lib/csum.c index e28884ce3ab3..4e044689bc37 100644 --- a/tools/testing/selftests/net/lib/csum.c +++ b/tools/testing/selftests/net/lib/csum.c @@ -105,9 +105,9 @@ static char *cfg_mac_src; static int cfg_proto = IPPROTO_UDP; static int cfg_payload_char = 'a'; static int cfg_payload_len = 100; -static uint16_t cfg_port_dst = 34000; -static uint16_t cfg_port_src = 33000; -static uint16_t cfg_port_src_encap = 33001; +static uint16_t cfg_port_dst = 13000; +static uint16_t cfg_port_src = 13001; +static uint16_t cfg_port_src_encap = 13002; static unsigned int cfg_random_seed; static int cfg_rcvbuf = 1 << 22; /* be able to queue large cfg_num_pkt */ static bool cfg_send_pfpacket; -- 2.53.0.1213.gd9a14994de-goog