[Bug 204340] [panic] nfsd, em, msix, fatal trap 9

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204340

--- Comment #23 from Rick Macklem <rmacklem at FreeBSD.org> ---
Created attachment 179512
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179512&action=edit
add svcpool_close so that svcpool_destroy doesn't get called when nfsd threads
are killed

This patch adds a new function to the server krpc called svcpool_close().
It is similar to svcpool_destroy(), but does not free the data structures,
so that the pool can be used again.

This function is then used instead of svcpool_destroy(), svcpool_create()
when the nfsd threads are killed.

These crashes are caused because the data structures were free'd by
svcpool_destroy() when the nfsd threads were killed off (or signalled somehow).
By avoiding the svcpool_destroy() call, the crashes should be avoided.

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