[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 #16 from ml at netfence.it ---
(In reply to Kirk McKusick from comment #15)

I've never had problems with snapshots on 11.x (or earlier), up to 11.4,
altough I never tried 11-STABLE.
The problem started when either I built a new machine with 12.1 or upgraded a
11.3 to 12.1. 12.2 also shows the problem. I never tried 12.0 or 12-STABLE.

As I said, I was going to try 13.0 (should almost be the same as 13-STABLE now,
shouldn't it?) If you'd like me to also try 12-STABLE, I will.
Does 11-STABLE differ that much from 11.4 (given 11.4 should be the last
release on this branch)? I ask because it will be harder for me to try this.



In fact I know how to trigger the problem exactly: I have a VM I can boot and
just issue "rm /mnt/.snap/1".
Unfortunately, this disk image, besides being quite large, holds data that
belongs to a customer of mine, so I cannot share it.

I will try to build a new one with different data, but previously I wasn't able
to trigger the problem until I "rsync"ed from there, so it will take some time
and some luck.



Thanks for your help.

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