(gdb) run -F Starting program: /usr/sbin/rpc.mountd -F [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". rpc.mountd: Version 2.3.4 starting Program received signal SIGSEGV, Segmentation fault. 0x0000555555564921 in DoMatch (text=0x0, p=0x5555555af100 "knode*.lanfear.net") at wildmat.c:75 75 wildmat.c: No such file or directory. (gdb) bt #0 0x0000555555564921 in DoMatch (text=0x0, p=0x5555555af100 "knode*.lanfear.net") at wildmat.c:75 #1 0x0000555555564b69 in wildmat (text=text@entry=0x0, p=p@entry=0x5555555af100 "knode*.lanfear.net") at wildmat.c:140 #2 0x000055555555e9ab in check_wildcard (clp=<optimized out>, ai=<optimized out>) at client.c:616 #3 client_check (ai=<optimized out>, clp=<optimized out>) at client.c:740 #4 client_check (clp=<optimized out>, ai=<optimized out>) at client.c:732 #5 0x000055555555edb4 in client_compose (ai=ai@entry=0x5555555ac830) at client.c:417 #6 0x000055555555c0f3 in auth_unix_ip (f=3) at cache.c:115 #7 0x000055555555d95a in cache_process_req (readfds=readfds@entry=0x7fffffffdc90) at cache.c:1417 #8 0x000055555555de28 in my_svc_run () at svc_run.c:118 #9 0x000055555555941a in main (argc=<optimized out>, argv=<optimized out>) at mountd.c:892 The commit message says "There is only one caller to host_reliable_addrinfo() that actually uses the string in ai->ai_canonname, and then only for debugging messages. Change those to display the IP address instead." That is not quite right. ./support/export/client.c check_wildcard() uses ai_canonname: static int check_wildcard(const nfs_client *clp, const struct addrinfo *ai) { char *cname = clp->m_hostname; char *hname = ai->ai_canonname; ... Kernel versions: server: 5.0.10-gentoo client: 5.0.10-200.fc29.x86_64 nfs-utils version: 2.3.4 "Are you using any of the security options?" No. exportfs -v /usr/local/k8s knode*.lanfear.net(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash) -- Mark Wagner <mark@xxxxxxxxxxx>