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Generating TTC segfaults #5508

@Yukinoroh

Description

@Yukinoroh

I am using .sfd files from February to make a ttc file.

I open them all at once, and select Generate TTC. After clicking Generate, Fontforge hangs and segfaults.

I could generate those ttc files in February, and I am using the same version of FontForge as I was using in February (FontForge-2023-01-01-a1dad3e-x86_64.AppImage).

I have tried with LinuxMint's old 2020 version as well, same issue.
I have tried compiling from source in this repository, same issue.

dmesg output:

[11034.905260] fontforge[35540]: segfault at 8 ip 00007fb07657b010 sp 00007ffc4e00b350 error 6 in libfontforge.so.4[7fb07630b000+2a3000]
[11034.905269] Code: 89 38 4a 8b 14 e9 48 89 50 08 4a 89 04 e9 49 63 47 18 e9 ad f4 ff ff 0f 1f 00 85 db 0f 85 01 fc ff ff 48 89 ef e8 50 73 d9 ff 04 25 08 00 00 00 00 00 00 00 0f 0b 31 c0 e9 35 fb ff ff 41 0f

Looks like some new version of an external library installed between February and now is causing libfontforge to be unhappy. I really don't see why this can happen otherwise..

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