Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/openssh-5.8p2-sigpipe.patch
diff -up openssh-5.8p2/ssh-keyscan.c.sigpipe openssh-5.8p2/ssh-keyscan.c
--- openssh-5.8p2/ssh-keyscan.c.sigpipe	2011-08-23 18:30:33.873025916 +0200
+++ openssh-5.8p2/ssh-keyscan.c	2011-08-23 18:32:24.574025362 +0200
@@ -715,6 +715,9 @@ main(int argc, char **argv)
	if (maxfd > fdlim_get(0))
 		fdlim_set(maxfd);
 	fdcon = xcalloc(maxfd, sizeof(con));
+ 
+	signal(SIGPIPE, SIG_IGN);
+
	read_wait = xcalloc(maxfd, sizeof(struct pollfd));
	for (j = 0; j < maxfd; j++)
		read_wait[j].fd = -1;
 
