[Bug 282449] UFS deadlock with install -S during freebsd-update

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282449

--- Comment #6 from vfs-locking <Grau_Smue@md5hashing.net> ---
(In reply to Mark Millard from comment #5)
Notwithstanding that it looks like an I/O pileup, my impression is that there
is something more.  My previous 2 or 3 encounters on VBox were all on hosting
ZFS with sync=disabled, and there were no errors on the host side at those
times since it continued other VMs and I/O.  I only tried sync=standard this
time because I was out of good ideas in attempts to reproduce.

On the VPS encounter a few weeks ago, there could very well have been limited
I/O.  But not zero.  It was the VPS encounter that convinced me I was looking
at something other than a VBox bug, which is what I had previously thought this
was.  I had changed from SCSI to AHCI in the guest, and even read about a fix
in VBox that could have been my issue, until it happened again.

From there, it felt like a locking or race bug to me, that was happening
because of the high volume of fsync() and rename() calls via install -S.  I
know those are hard to reproduce, but thats why I was willing to try
repeatedly.

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