Some observations:

Going back to fontforge version 20201107~dfsg-4 and its dependencies, I
notice the following warning message:

21900/1114292:
  Add extrema...
  Simplifying outlines...
NaN value in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creationNaN value in spline creationNaN value in spline
creationNaN value in spline creationNaN value in spline creationNaN value
in spline creation22000/1114292:

  Add extrema...
  Simplifying outlines...

A more recent version of Fontforge will just let the application hang.

I will have to contact upstream to figure out what is causing this.

-- 
Danai


On Sun, 17 Jul 2022 at 16:15, Danai SAE-HAN (韓達耐) <danai.sae...@gmail.com>
wrote:

> Very interesting; font bkai gets stuck during the fontforge compilation at
> 21900/1114292 and stays at 100% CPU usage.  Other fonts seem fine.
> This requires a bit more investigating.  My gut tells me the recent
> fontforge upload has a regression somewhere.
>
> --
> Danai
>
> On Sat, 16 Jul 2022 at 22:42, Danai SAE-HAN (韓達耐) <danai.sae...@gmail.com>
> wrote:
>
>> Thanks Lucas, I'll look at it tonight.
>>
>> On Sat, 16 Jul 2022, 22:04 Lucas Nussbaum, <lu...@debian.org> wrote:
>>
>>> Source: latex-cjk-chinese-arphic
>>> Version: 1.24
>>> Severity: serious
>>> Justification: FTBFS
>>> Tags: bookworm sid ftbfs
>>> User: lu...@debian.org
>>> Usertags: ftbfs-20220716 ftbfs-bookworm
>>>
>>> Hi,
>>>
>>> During a rebuild of all packages in sid, your package failed to build
>>> on amd64.
>>>
>>>
>>> Relevant part (hopefully):
>>> > Reading subfont definition file
>>> `/usr/share/texlive/texmf-dist/fonts/sfd/ttf2pk/Unicode.sfd'...
>>> > Writing extended font definition file `c70bsmi.fdx'...
>>> >
>>> > # Remove the *.enc files; they're not used.
>>> > ( cd build/bsmi00lp && rm -f *.enc )
>>> >
>>> > # Create a Type1 font map.
>>> >
>>> > # Create entries for the font definition file
>>> > # `c00bsmi.fd' (which uses UBig5 encoding).
>>> >
>>> > # Create entries for the font definition file
>>> > # `c70bsmi.fd' (which uses Unicode encoding).
>>> >
>>> > touch build-stamp.bsmi
>>> > E: Build killed with signal TERM after 150 minutes of inactivity
>>>
>>>
>>> The full build log is available from:
>>>
>>> http://qa-logs.debian.net/2022/07/16/latex-cjk-chinese-arphic_1.24_unstable.log
>>>
>>> All bugs filed during this archive rebuild are listed at:
>>>
>>> https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=ftbfs-20220716;users=lu...@debian.org
>>> or:
>>>
>>> https://udd.debian.org/bugs/?release=na&merged=ign&fnewerval=7&flastmodval=7&fusertag=only&fusertagtag=ftbfs-20220716&fusertaguser=lu...@debian.org&allbugs=1&cseverity=1&ctags=1&caffected=1#results
>>>
>>> A list of current common problems and possible solutions is available at
>>> http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to
>>> contribute!
>>>
>>> If you reassign this bug to another package, please marking it as
>>> 'affects'-ing
>>> this package. See https://www.debian.org/Bugs/server-control#affects
>>>
>>> If you fail to reproduce this, please provide a build log and diff it
>>> with mine
>>> so that we can identify if something relevant changed in the meantime.
>>>
>>>

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