[Bug 241070] dumpon: dumpon opens geom devices non-exclusively

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241070

--- Comment #5 from Mark Johnston <markj at FreeBSD.org> ---
(In reply to Ravi Pokala from comment #4)
I think it's a "known" bug.  When dumping we start writing as far into the dump
device as possible (i.e., the end of the dump lines up with the end of the dump
device), and this policy happens to minimize the risk that swapping will
overwrite dump data.

I'm not sure that we could really reorder the scripts.  savecore depends on
local filesystems being mounted and clean, and we want dumpon to run as early
as possible.  It is also handy to be able to run savecore manually after the
system has finished booting.  Swapping during boot is also (hopefully) rather
unusual.

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