https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206634

            Bug ID: 206634
           Summary: panic: ncllock1 after NFSv4 server was taken offline
                    and brought back to life; lots of spam about
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 166130
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=166130&action=edit
Panic screenshot from IPMI

A FreeBSD 11.0-CURRENT NFSv4 client with a GENERIC-NODEBUG kernel panicked with
`panic: ncllock1` after the NFSv4 server it was connected to was brought
offline, then brought back to life.

I've attached some screenshots. Unfortunately I can't get a dump because my
swap device is too small :(...

The last built kernel/world was from this github revision:

commit ec77f0bef381d18a7cb6847d3e0f02c0f4087f05
Author: imp <[email protected]>
Date:   Tue Jan 5 21:20:47 2016 +0000

    Use the more proper -f. Leave /bin/rm in place since that's what
    other rc scripts have, though it isn't strictly necessary.

Notes:
    svn path=/head/; revision=293227

The machine's still up -- please let me know if there's anything I can grab to
help with debugging this issue.

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