[Bug 206634] "panic: ncllock1" from FreeBSD client after NFSv4 server was taken offline and brought back to life; lots of spam about "protocol prob err=10006"

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

Rick Macklem <rmacklem at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|freebsd-fs at FreeBSD.org      |rmacklem at FreeBSD.org
             Status|New                         |In Progress

--- Comment #4 from Rick Macklem <rmacklem at FreeBSD.org> ---
Created attachment 167209
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=167209&action=edit
Patch to delete panic that no longer applies to current/head

r285632 changed vfs_hash_get() so that it no longer calls vget()
with VI_LOCK() held. As such, this panic() and the VI_UNLOCK() should
not be done. The attached patch (not yet tested by me) makes this change.
(Note that this panic and patch only apply to head/current and not
 stable/10 or earlier.)
Please let me know if you have an NFSv4 server crash/reboot after applying
the patch and whether or not it seems to work.

I will try and test the patch. I cannot commit it to head/current until
mid-April.

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