[Bug 257314] FBSD 13 crash after some KDE parts crash supposing out of swap space

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 23 Jul 2021 20:56:49 UTC

--- Comment #23 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Michael from comment #20)

> all messages I pasted, I copied in original sequence starting with first occurrence in log

Of which exact type of message? If it was a kill message, then it
was already too late to see the RAM use around the time just
before the kill was done.

One of the problems with trying to monitor the system is that,
for example, large changes in the amount of attempted memory
use (and RAM use) being attempted could occur multiple times
per second. But if such happens, it is difficult to observe
usefully to even detect that such is the type of context.

Some folks try having top running in a loop, sleeping between
runs, logging to a file so there is at least a history-sequence
(presuming this does not end up killed before the file system
updates). A similar point goes for gstat output. But these also
end up competing with the paging/swapping activity for I/O
resource use.

So far as I can tell, the best next evidence that we could get is
the patched-in messaging about exactly which condition initiated
each kill.

The patch does not attempt to prevent the kills or make things
work for you, but just reports what condition in the kernel lead
to each.

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