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Re: [RFC] Moving to Guile 2.2 and away from GUB

From: Jonas Hahnfeld
Subject: Re: [RFC] Moving to Guile 2.2 and away from GUB
Date: Thu, 25 Nov 2021 13:59:36 +0100
User-agent: Evolution 3.42.1

Am Donnerstag, dem 25.11.2021 um 08:40 +0100 schrieb Jonas Hahnfeld via
Discussions on LilyPond development:
> Am Mittwoch, dem 24.11.2021 um 23:01 +0100 schrieb Han-Wen Nienhuys:
> > On Wed, Nov 24, 2021 at 8:13 PM Jonas Hahnfeld via Discussions on
> > LilyPond development <> wrote:
> > > Assuming no major problems are found, we could then move completely to
> > > Guile 2.2 and do releases without GUB. Both steps still require a bit
> > > of work; I'm relatively sure there is still a GC related issue causing
> > > (very rare) crashes with Guile 2.2
> > 
> > can you say more about this?
> Not really: I remember weird crashes with dumps that were not
> immediately obvious.

It's relatively reproducible, I get it every 2nd-3rd time for full
'make doc's. Looking at the core dump, it's crashing in
System::derived_mark when marking all_elements_ because the std::vector
has garbage in its size field (it was probably freed). What I don't
understand is how that can happen since the only way of setting
all_elements_ is in System::init_elements where the originating SCM is
also protected...

> There's also this in a recent CI run:

And Jean just hit it (or another crash) again:

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