Starting and stopping nfsd apparently results in permanently disabling it

[Mark Raynsford]

Hello.

I've never used NFS, so this has been my first time setting it up. I
ran the following:

/usr/sbin/rpcbind -d -h 10.2.8.8 -s
/usr/sbin/nfsd --debug -n 4 -t -h 10.2.8.8
/usr/sbin/mountd -d -h 10.2.8.8 -l -p 9990 /local/etc/mountd/exports

Note that I'm running the above under process supervision and therefore
require that each server must be kept in the foreground rather than
forking into the background where it can't be supervised. I had to use
the undocumented --debug flag for nfsd to do this, but I don't think
that's related to my problem.

Anyway, I then realized that I actually meant to bind to 10.2.8.9
instead, so I killed all of the above and then ran:

/usr/sbin/rpcbind -d -h 10.2.8.9 -s
/usr/sbin/nfsd --debug -n 4 -t -h 10.2.8.9
/usr/sbin/mountd -d -h 10.2.8.9 -l -p 9990 /local/etc/mountd/exports

Unfortunately, nfsd refused to start:

nfsd[49031]: Can't read stable storage file: Operation not permitted

Running ktrace on the nfsd process lead me to:

 84873 nfsd     CALL  openat(AT_FDCWD,0x403b60,0x2<O_RDWR>)
 84873 nfsd     NAMI  "/var/db/nfs-stablerestart"
 84873 nfsd     RET   openat 3
 84873 nfsd     CALL  fstat(0x3,0x7fffffffe940)
 84873 nfsd     STRU  struct stat {dev=280827606, ino=66203, mode=0100600, nlink=1, uid=0, gid=0, rdev=4294967295, atime=1525025391.17
1870000, mtime=1525025391.171870000, ctime=1525025391.171870000, birthtime=1525025391.171870000, size=0, blksize=131072, blocks=1, fla
gs=0x800 }
 84873 nfsd     RET   fstat 0
 84873 nfsd     CALL  openat(AT_FDCWD,0x403ece,0x2<O_RDWR>)
 84873 nfsd     NAMI  "/var/db/nfs-stablerestart.bak"
 84873 nfsd     RET   openat 4
 84873 nfsd     CALL  fstat(0x4,0x7fffffffe9d0)
 84873 nfsd     STRU  struct stat {dev=280827606, ino=66204, mode=0100600, nlink=1, uid=0, gid=0, rdev=4294967295, atime=1525025391.17
1956000, mtime=1525025391.171956000, ctime=1525025391.171956000, birthtime=1525025391.171956000, size=0, blksize=131072, blocks=1, fla
gs=0x800 }
 84873 nfsd     RET   fstat 0
 84873 nfsd     CALL  nfssvc(NFSSVC_BACKUPSTABLE,0)
 84873 nfsd     RET   nfssvc -1 errno 22 Invalid argument
 84873 nfsd     CALL  nfssvc(NFSSVC_STABLERESTART,0x604590)
 84873 nfsd     RET   nfssvc -1 errno 1 Operation not permitted

Please see the trace files:

  http://ataxia.io7m.com/2018/04/29/ktrace.out
  http://ataxia.io7m.com/2018/04/29/ktrace.out.txt

The /var/db/nfs-stablerestart and /var/db/nfs-stablerestart.bak files
are empty, root:wheel, and mode 600. Nothing I can do can seem to get
nfsd to come back up. It seems to be permanently disabled somehow and
always gives the same error.

How can I fix this?

-- 
Mark Raynsford | http://www.io7m.com

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 228 bytes
Desc: OpenPGP digital signature
URL: <http://lists.freebsd.org/pipermail/freebsd-net/attachments/20180429/29780d30/attachment.sig>