[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 #15 from Kirk McKusick <mckusick at FreeBSD.org> ---
(In reply to ml from comment #14)
Can you successfully run these operations on stable/11?
Or put another way, do these problems only show up when you try to run on
stable/12?

It would be helpful to find out if the problem is fixed when running on
stable/13 as that would let us review changes made in the development of
stable/13 to find the likely culprit. If is not fixed in stable/13 but it works
in stable/11, then we will know that the breakage happened during the
development of stable/12.

To be reliably able to track down the problem, we need a disk image of the
filesystem that experiences the problem (i.e. the UFS+SU filesystem on which
you are having the problem) along with a set of commands that when run on that
image cause the problem to happen.

I realise that you do not know exactly what the parameters are for triggering
the problem. I would suggest saving an image and then use script(1) to record
the set of commands that you run trying to cause the hang. When you eventually
get a hang you will presumably know how to reliably recreate it. Hopefully you
can narrow it down to something where you do not need to run too many commands
to trigger the problem.

You can then gzip(1) the disk image and let us know where we can pick it up
along with the set of cammands that cause the hang. We can then verify that we
can reproduce the hang and if so finding a fix can proceed.

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