NFSv4 stuck

[Slawa Olhovchenkov]

I am have NFSv4 mount dir and some time got stucked after access.

Mounted by automount:

# cat /etc/nfs.map
/NFS    -nfsv4,intr,soft,sec=krb5i,gssname=host stat:/

# mount -v
map -hosts on /net (autofs, fsid 01ff00cfcf000000)
map nfs.map on /NFS (autofs, fsid 02ff00cfcf000000)
map nfs.map on /NFS (autofs, fsid 03ff00cfcf000000)
map nfs.map on /NFS (autofs, fsid 04ff00cfcf000000)
map nfs.map on /NFS (autofs, fsid 05ff00cfcf000000)
stat:/ on /NFS (nfs, nfsv4acls, automounted, fsid 0aff003a3a000000)

# procstat -a | grep -e rpc -e gss -e nfs
  840     1   840   840     0   1 root     select    FreeBSD ELF64 rpcbind     
  956     1   956   956     0   1 root     pause     FreeBSD ELF64 nfsuserd    
  957   956   956   956     0   1 root     sbwait    FreeBSD ELF64 nfsuserd    
  958   956   956   956     0   1 root     select    FreeBSD ELF64 nfsuserd    
  960   956   956   956     0   1 root     select    FreeBSD ELF64 nfsuserd    
  961   956   956   956     0   1 root     sbwait    FreeBSD ELF64 nfsuserd    
  969     1   969   969     0   1 root     select    FreeBSD ELF64 rpc.statd   
  972     1   972   972     0   1 root     rpcsvc    FreeBSD ELF64 rpc.lockd   
10629  1098 10629 10629     0   1 root     gssstate  FreeBSD ELF64 sshd        
10687 10652 10687 10647 10647   1 admin    gssstate  FreeBSD ELF64 csh         
14521  1098 14521 14521     0   1 root     gssstate  FreeBSD ELF64 sshd        
14924 14896 14924 14892 14892   1 admin    nfs       FreeBSD ELF64 automount   
45455 45454 45455 45455 45455   1 slw      gssstate  FreeBSD ELF64 tcsh        
63495 63481 42791 42791     0   1 root     rpccon    FreeBSD ELF64 find        
79451     0     0     0     0   1 -        rpccon    -             nfscl       
79452 79450 79452 79452 79452   1 slw      rpccon    FreeBSD ELF64 tcsh        

How to unlock system w/o reboot?

automount -u don't work