[luatex] segfault with luatex id 7509

[Henri Menke]

On Mon, 2022-10-03 at 18:02 +0200, luigi scarso wrote:
> On Mon, Oct 3, 2022 at 5:52 PM Werner LEMBERG <wl at gnu.org> wrote:
> 
> > > > Please unpack the attached tarball and call `./zzz.sh`.  On my
> > > > openSUSE box using a current SVN version of TeXLive, this
> > > > crashes
> > > > with a segfault.
> > > 
> > > confirmed, I will check it this evening.
> > 
> > Could you find the cause of the problem?  For backwards
> > compatibility
> > I'm interested in a work-around...
> > 
> > 
> At the moment your code here works as with luajittex
> and also luatex with the luatex-plain seems to be ok.
> $> mtxrun --script plain notation.texi
> (I have to add @bye to the end of notation.texi)
> 
> Use
> $> mtxrun --script plain --make
> to build the luatex-plain format.
> 

I was also able to reproduce the issue only on the first run. When I
observed the segfault, I wanted to run it again with a debugger
attached but any subsequent run did not expose the issue.  So my first
guess is that this has to do with on-the-fly creation of font maps,
which---once created---are reused and therefore it doesn't fail the
second time. If I find the time I'll try again in a containerized
environment where I can easily restart from a clean slate.

Cheers, Henri