$ wget https://salsa.debian.org/fonts-team/fonts-femkeklaver/-/raw/master/femkeklaver.ttf
$ echo 'Open($1)' > open.pe
$ export LANG=C
$ fontforge -script open.pe femkeklaver.ttf 
Program root: /usr
Copyright (c) 2000-2023. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Version: 20230101
 Based on sources from 2023-01-18 18:05 UTC-D.
Segmentation fault

$ LANG=C rr record fontforge -script /home/benutzer/source/fonts-femkeklaver/git/fonts-femkeklaver/debian/clear-fstype.pe /home/benutzer/source/fonts-femkeklaver/git/fonts-femkeklaver/femkeklaver.ttf
$ rr replay -o-q
...
Breakpoint 3, iconv (cd=cd@entry=0x55b4437f72d0, inbuf=inbuf@entry=0x7fff48abee88, inbytesleft=inbytesleft@entry=0x7fff48abee80, outbuf=outbuf@entry=0x7fff48abeea0, outbytesleft=outbytesleft@entry=0x7fff48abee98) at ./iconv/iconv.c:32
32      {
(rr) finish
Run till exit from #0  iconv (cd=cd@entry=0x55b4437f72d0, inbuf=inbuf@entry=0x7fff48abee88, inbytesleft=inbytesleft@entry=0x7fff48abee80, outbuf=outbuf@entry=0x7fff48abeea0, outbytesleft=outbytesleft@entry=0x7fff48abee98) at ./iconv/iconv.c:32
0x00007fd0fc8a0b69 in do_iconv (cd=0x55b4437f72d0, inbuf=<optimized out>, inbuf@entry=0x7fff48abeef0, incount=<optimized out>, inunitsize=inunitsize@entry=1, outunitsize=outunitsize@entry=1) at ./Unicode/ucharmap.c:101
101             if (iconv(cd, (iconv_arg2_t)&inbuf, &incount, &dst, &outremain) == (size_t)-1) {
Value returned is $19 = 18446744073709551615
(rr) next
102                 if (errno == E2BIG) {
(rr) print errno
$20 = 84
(rr) print inbuf
$21 = <optimized out>
(rr) up
#1  0x00007fd0fc8a0fd5 in utf82def_copy (ufrom=ufrom@entry=0x7fff48abeef0 "Warning: Mac and Windows entries in the 'name' table differ for the\n Copyright string in the language English (US)\n Mac String: Typeface © (your company). 2008. All Rights Reserved\nWindows String: Typeface © (femkeklaver.nl). 2008. All Rights Reserved\n") at ./Unicode/ucharmap.c:159
159         return do_iconv(from_utf8, ufrom, strlen(ufrom), sizeof(ufrom[0]), sizeof(char));
(rr) print ufrom
$22 = 0x7fff48abeef0 "Warning: Mac and Windows entries in the 'name' table differ for the\n Copyright string in the language English (US)\n Mac String: Typeface © (your company). 2008. All Rights Reserved\nWindows String: Typeface © (femkeklaver.nl). 2008. All Rights Reserved\n"
(rr) bt
#0  do_iconv (cd=0x55b4437f72d0, inbuf=<optimized out>, inbuf@entry=0x7fff48abeef0, incount=<optimized out>, inunitsize=inunitsize@entry=1, outunitsize=outunitsize@entry=1) at ./Unicode/ucharmap.c:102
#1  0x00007fd0fc8a0fd5 in utf82def_copy (ufrom=ufrom@entry=0x7fff48abeef0 "Warning: Mac and Windows entries in the 'name' table differ for the\n Copyright string in the language English (US)\n Mac String: Typeface © (your company). 2008. All Rights Reserved\nWindows String: Typeface © (femkeklaver.nl). 2008. All Rights Reserved\n") at ./Unicode/ucharmap.c:159
#2  0x00007fd0fc958a84 in NOUI__LogError (format=<optimized out>, ap=ap@entry=0x7fff48abf0b0) at ./fontforge/nouiutil.c:55
#3  0x00007fd0fc958c49 in NOUI_LogError (format=<optimized out>) at ./fontforge/nouiutil.c:66
#4  0x00007fd0fc98555a in TTFAddLangStr (language=<optimized out>, spec=<optimized out>, plat=<optimized out>, stroff=<optimized out>, strlength=<optimized out>, id=0, info=0x7fff48abf220, ttf=0x55b4437ff990) at ./fontforge/parsettf.c:1609
#5  readttfcopyrights (info=0x7fff48abf220, ttf=0x55b4437ff990) at ./fontforge/parsettf.c:1748
#6  readttfpreglyph (info=0x7fff48abf220, ttf=0x55b4437ff990) at ./fontforge/parsettf.c:1814
#7  readttf (filename=0x55b4437ff930 "/home/benutzer/source/fonts-femkeklaver/git/fonts-femkeklaver/femkeklaver.ttf", info=0x7fff48abf220, ttf=0x55b4437ff990) at ./fontforge/parsettf.c:5554
#8  _SFReadTTF (ttf=ttf@entry=0x55b4437ff990, flags=flags@entry=0, openflags=openflags@entry=0, filename=filename@entry=0x55b4437ff930 "/home/benutzer/source/fonts-femkeklaver/git/fonts-femkeklaver/femkeklaver.ttf", chosenname=chosenname@entry=0x0, fd=fd@entry=0x0) at ./fontforge/parsettf.c:6342
[...]
(rr) finish
Run till exit from #1  0x00007fd0fc8a0fd5 in utf82def_copy (ufrom=ufrom@entry=0x7fff48abeef0 "Warning: Mac and Windows entries in the 'name' table differ for the\n Copyright string in the language English (US)\n Mac String: Typeface © (your company). 2008. All Rights Reserved\nWindows String: Typeface © (femkeklaver.nl). 2008. All Rights Reserved\n") at ./Unicode/ucharmap.c:159
0x00007fd0fc958a84 in NOUI__LogError (format=<optimized out>, ap=ap@entry=0x7fff48abf0b0) at ./fontforge/nouiutil.c:56
56          fprintf(stderr,"%s",str);
Value returned is $23 = 0x0