GNU bug report logs - #79116
31.0.50; Crash on IGC build

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From: Helmut Eller <eller.helmut <at> gmail.com>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: spd <at> toadstyle.org, Eli Zaretskii <eliz <at> gnu.org>, 79116 <at> debbugs.gnu.org, pipcet <at> protonmail.com
Subject: bug#79116: 31.0.50; Crash on IGC build
Date: Fri, 01 Aug 2025 09:00:40 +0200

On Thu, Jul 31 2025, Gerd Möllmann wrote:

> Hm, don't know what's best to do. At least it can't be the reason for
> the current case, right?

The assertion was:

    AVER(RefSetSub(ScanStateUnfixedSummary(ss), SegSummary(seg))); /* <design/check/#.common> */

It looks like MPS found a reference to a zone/generation that it was not
expecting to find.  If something is able to by-pass memory barriers it
could create such unexpected references.  Of course, I'm just
speculating.  I don't even know how Pip figured out that this particular
assertion failed.

I would not change anything without a reproducible test case.  Could be
tricky to create the problematic situation: the access must happen after
the flip and not go through read-protected objects.

Helmut

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