[Bug 228174] [dump] dump(8) can read garbage and loop forever

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228174

--- Comment #1 from Kirk McKusick <mckusick at FreeBSD.org> ---
Are you are dumping on a live filesystem? If so, is it possible that the file
causing the problem is being written at the time that dump is trying to dump
it? If so, then dump may read it in an inconsistent state (e.g., it has
allocated, but not yet initialised one of its indirect blocks (hence the
garbage value to see when it reads the not-yet initialised block. The reason
for dumping a snapshot is to ensure that you get a consistent view of the
filesystem.

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