[Bug 292645] ZFS: panic in zvol_geom_open triggered by aio_test:vectored_unaligned

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292645

--- Comment #1 from Alan Somers <asomers@FreeBSD.org> ---
The crash is a race between destroying a zvol and tasting it.  Tasting normally
happens right after creation, so this panic can happen whenever a zvol has a
very short lifetime.  The panic can be reproduced in fish-shell like this:

for i in (seq 1000); sudo zfs create -V 1m -o volmode=dev testpool/testvol;
sudo zfs destroy testpool/testvol; end

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