[Bug 242768] [panic] Fatal trap 12: current process (nfsd: service)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242768

--- Comment #11 from Rick Macklem <rmacklem at FreeBSD.org> ---
Created attachment 210429
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=210429&action=edit
check for a non-NULL tvp returned by nfsvno_getvp()

Duh. It's the obvious ones that are hard to spot.
I took another look and the bug is obvious.
nfsvno_getvp() returns NULL if it can't get the
vnode and this code didn't check for non-NULL
before doing the unlock.

The attached patch should avoid the crash.

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