[Bug 244048] mksnap_ffs hangs machine (12.1 regression over 11.3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244048

--- Comment #12 from ml at netfence.it ---
Just for the record...
While preparing to install the mentioned patch, I reached a status where:
_ issuing mksnap_ffs always locks the machine;
_ unmounting the filessytem (the one I would run mksnap_ffs on) also causes a
deadlock (I guess it's the same deadlock, but I didn't analyze it);
_ shutting down, the machine cannot write all buffers and after reboot all the
filesystem will require fsck;
_ the fsck on said filesystem will be problematic (hangs or panics).

So it seems that, after a lot of snapshots creation/deletion, the situation is
already compromised *before* I try and take the snapshot that hangs.

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