[Bug 260793] 'swapon -a' can crash the system

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260793

--- Comment #5 from Peter Much <pmc@citylink.dinoex.sub.org> ---
Mark, 
there seems to be a logical flaw in here:

You say we would be safe if the swap would be opened in write-exclusive mode.
And You say, this cannot be done because of 
https://github.com/freebsd/freebsd-src/blob/main/sys/vm/swap_pager.c#L3006
which says that savecore(8) needs write access to it.

Now I am wondering what business savecore(8) might have on an already activated
swap  anyway - because I would think it's just too late then.

But what I definitely don't understand: what is the point of having savecore(8)
access a swapspace that has been trimonce'd right before? (The swapon(8)
manpage does already say that this wouldn't work.)

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