tcp: Attempt to mitigate EPOLLRDHUP storms with half-closed connections

Link: https://github.com/containers/podman/issues/23686

1 files changed, 8 insertions, 4 deletions

diff --git a/tcp.c b/tcp.c
index 77c62f0..7b3376f 100644
--- a/tcp.c
+++ b/tcp.c
@@ -424,23 +424,27 @@ int tcp_set_peek_offset(int s, int offset)
  */
 static uint32_t tcp_conn_epoll_events(uint8_t events, uint8_t conn_flags)
 {
+	uint32_t rdhup;
+
 	if (!events)
 		return 0;
 
+	rdhup = (events & SOCK_FIN_RCVD) ? 0 : EPOLLRDHUP;
+
 	if (events & ESTABLISHED) {
 		if (events & TAP_FIN_SENT)
 			return EPOLLET;
 
 		if (conn_flags & STALLED)
-			return EPOLLIN | EPOLLOUT | EPOLLRDHUP | EPOLLET;
+			return EPOLLIN | EPOLLOUT | rdhup | EPOLLET;
 
-		return EPOLLIN | EPOLLRDHUP;
+		return EPOLLIN | rdhup;
 	}
 
 	if (events == TAP_SYN_RCVD)
-		return EPOLLOUT | EPOLLET | EPOLLRDHUP;
+		return EPOLLOUT | EPOLLET | rdhup;
 
-	return EPOLLRDHUP;
+	return rdhup;
 }
 
 /**