[Bug 285993] nvme device breakage in 14.2 STABLE n270867-25df691800f0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285993

--- Comment #7 from Colin Percival <cperciva@FreeBSD.org> ---
Thanks Warner!

Jim, what sort of device is this?  Is it possible that it's coming loose and
making the system think it's being unplugged?  Can you add a printf to check if
bus_child_present(dev) is returning 0?

The fact that we're getting to this point -- as Warner points out, this is in
the teardown path -- suggests that something has gone wrong before this patch
is implicated since we shouldn't be calling nvme_ctrlr_destruct while the
device is running.

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