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Date:      Thu, 29 Oct 2020 08:26:35 +0000
From:      bugzilla-noreply@freebsd.org
To:        toolchain@FreeBSD.org
Subject:   [Bug 250388] unable to make buildworld releng/12.1. clang always crashes
Message-ID:  <bug-250388-29464-Jydm0UWlIz@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-250388-29464@https.bugs.freebsd.org/bugzilla/>
References:  <bug-250388-29464@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250388

Mark Millard <marklmi26-fbsd@yahoo.com> changed:

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                 CC|                            |marklmi26-fbsd@yahoo.com

--- Comment #2 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to igor.polovykh from comment #0)

> . . . killed: out of swap space

If your console messasges do not include
messages about "swap_pager_getswapspace(...): failed",
then it is unlikely that being out of swap space
is the actual issue even when it reports: "was killed:
out of swap space" messages. For such contexts, making
the swap area bigger does not help.

In other words, "was killed: out of swap space"
is frequently a misnomer and not to be believed
for "why" the kill happened or what should be
done about it --without other evidence also being
present anyway.

Do you have "swap_pager_getswapspace(...): failed"
notices? The answer would likely guide what sorts
of things would be appropriate to avoid the "killed:
out of swap space" events.

FYI: Other causes of the kill events include . . .

Sustained low free RAM (via stays-runnable processes).
A sufficiently delayed pageout.
The swap blk uma zone was exhausted.
The swap pctrie uma zone was exhausted.

(stays-runnable processes are not swapped out
[kernel stacks are not swapped out] but do actively
compete for RAM via paging activity. In such a
context, free RAM can stay low.)

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