[Bug 282169] zfs rename deadlock with mountd, df & fstat (and possibly others)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282169

--- Comment #4 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Peter Eriksson from comment #3)
> procstat seems to be inside some function called sysctl_root_handler_locked.

Yes, that's the function procstat -k uses to collect kernel stacks.  This is
similar to how "ps ... | grep ..." might show you the grep process.

I couldn't see any obvious culprits among the functions blocked in ZFS
routines.  They were all blocked on a ZFS teardown lock, which is why I think
the lock was leaked somehow.

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