Otherwise in case of a poll error, we end-up looping forever. Squash-to: "mptcp: add basic kselftest for mptcp" v1 -> v2: - better error message, as per Florian's suggestion Signed-off-by: Paolo Abeni <pabeni(a)redhat.com&gt; --- tools/testing/selftests/net/mptcp/mptcp_connect.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c index 5aaf7690dc10..ddfd85b31808 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_connect.c +++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c @@ -340,6 +340,12 @@ static int copyfd_io(int infd, int peerfd, int outfd) return 4; } } + + if (fds.revents & (POLLERR | POLLNVAL)) { + fprintf(stderr, "Unexpected revents: " + "POLLERR/POLLNVAL(%x)\n", fds.revents); + return 5; + } } close(peerfd); -- 2.21.0