I have captured "tcpdump port 2049 -w nfs_dump.log" - http://users.suse.cz/~mpluskal/bugs/934202/nfs_dump.log.xz when issue occured: # dmesg ... [33386.454585] Netfilter messages via NETLINK v0.30. [48056.618081] NFS: v4 server nfs.suse.cz returned a bad sequence-id error! [48056.643065] NFS: nfs4_handle_delegation_recall_error: unhandled error -10026. [48096.219741] NFS: v4 server nfs.suse.cz returned a bad sequence-id error!