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Subject: [Bug 201155] NFS4 exports are blocked when NIS master server is
 unreachable
Date: Sat, 27 Jun 2015 23:14:52 +0000
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.1-STABLE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: email.ahmedkamal@googlemail.com
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201155

            Bug ID: 201155
           Summary: NFS4 exports are blocked when NIS master server is
                    unreachable
           Product: Base System
           Version: 10.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: email.ahmedkamal@googlemail.com

My Setup is:
* A FreeBSD 10.1 with ZFS exporting NFS4 to a Linux server
* That Linux server is a NIS master for the FreeBSD box

The issue is:
* Upon power failure .. Both servers starting fresh
* FreeBSD boots faster (grin)
* FreeBSD doesn't find NIS master and bombards logs with hundreds of thousands
of messages!! like 
  Jun 27 13:47:53 nas /usr/sbin/ypbind[827]: NIS server [192.168.10.254] for
domain "SIVISION" not responding
  Jun 27 13:48:24 nas last message repeated 51704 times
  Jun 27 13:49:26 nas last message repeated 104381 times
* In this state, FreeBSD does not allow any other machine to NFS4 mount its
shares. This includes the NIS master Linux box
* Linux boot hangs waiting for the NFS share to allow it to mount it
* We are in a deadlock. Linux waiting for the NFS share to mount, while FreeBSD
is waiting for the NIS server on Linux to start

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