[Bug 194264] crash in unp_gc -> unp_accessable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194264

--- Comment #2 from Andriy Gapon <avg at FreeBSD.org> ---
Created attachment 148136
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=148136&action=edit
log of other thread being in sofree -> unp_dispose

So, looks like I missed an elephant in the room. There was a thread that was
running soclose -> sofree -> unp_dispose on exactly the same socket that 
unp_gc_process was processing. The socket is 0xfffff801e7420000 (see the
previous attachment).

So, this is the race.

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