Bug#1117187: SegFault: Unexpected multibyte character

[Avinash Sonawane]

Package: luanti
Version: 5.10.0+dfsg-5
Severity: important
X-Debbugs-Cc: rootkea at gmail.com

Dear Maintainer,

Getting SegFault at the start with an error message "Unexpected multibyte
character":
$ /usr/games/luanti
2025-10-04 17:30:17: [Main]: Automatically selecting world at
[/home/rootkea/.minetest/worlds/world1]
2025-10-04 17:30:17: ERROR[Main]: In thread 7f4e7f347180:
2025-10-04 17:30:17: ERROR[Main]: ./src/client/keycode.cpp:273:
KeyPress::KeyPress(const char*): A fatal error occurred: Unexpected multibyte
character
Aborted (core dumped)
$

Here's the backtrace:
2025-10-04 17:30:46: ERROR[Main]: In thread 7ffff5b1d180:
2025-10-04 17:30:46: ERROR[Main]: ./src/client/keycode.cpp:273:
KeyPress::KeyPress(const char*): A fatal error occurred: Unexpected multibyte
character

Thread 1 "luanti" received signal SIGABRT, Aborted.
__pthread_kill_implementation (threadid=<optimized out>, signo=signo at entry=6,
no_tid=no_tid at entry=0) at ./nptl/pthread_kill.c:44
warning: 44     ./nptl/pthread_kill.c: No such file or directory
(gdb) bt
#0  __pthread_kill_implementation (threadid=<optimized out>,
signo=signo at entry=6, no_tid=no_tid at entry=0) at ./nptl/pthread_kill.c:44
#1  0x00007ffff6e9e9ff in __pthread_kill_internal (threadid=<optimized out>,
signo=6) at ./nptl/pthread_kill.c:89
#2  0x00007ffff6e49cc2 in __GI_raise (sig=sig at entry=6) at
../sysdeps/posix/raise.c:26
#3  0x00007ffff6e324ac in __GI_abort () at ./stdlib/abort.c:73
#4  0x0000555555abce46 in fatal_error_fn (msg=0x555555d91088 "Unexpected
multibyte character", file=<optimized out>, line=<optimized out>,
    function=0x555555d91068 "KeyPress::KeyPress(const char*)") at
./src/debug.cpp:61
#5  0x000055555577b185 in KeyPress::KeyPress (this=<optimized out>,
name=<optimized out>, this=<optimized out>, name=<optimized out>)
    at ./src/client/keycode.cpp:273
#6  0x000055555577b569 in getKeySetting
(settingname=settingname at entry=0x555555dbd2b7 "keymap_cmd") at
/usr/include/c++/14/bits/basic_string.h:227
#7  0x000055555577ba3c in KeyCache::populate (this=0x5555564e8f00) at
./src/client/inputhandler.cpp:37
#8  0x00005555556ecc99 in KeyCache::KeyCache (this=0x5555564e8f00) at
./src/client/inputhandler.h:36
#9  InputHandler::InputHandler (this=<optimized out>, this=<optimized out>) at
./src/client/inputhandler.h:225
#10 0x0000555555bcfcc5 in RealInputHandler::RealInputHandler
(this=0x5555564e8d10, receiver=0x555556037b50) at
./src/client/inputhandler.h:273
#11 ClientLauncher::init_input (this=0x7fffffffd540) at
./src/client/clientlauncher.cpp:302
#12 ClientLauncher::run(GameStartData&, Settings const&) [clone .constprop.0]
(this=0x7fffffffd540, start_data=..., cmd_args=...)
    at ./src/client/clientlauncher.cpp:113
#13 0x00005555556b78ab in main (argc=<optimized out>, argv=<optimized out>) at
./src/main.cpp:264
(gdb)

Interesting thing I noticed is that I see this SegFault when I'm using KDE
Plasma but if I switch to GNOME then there's no SegFault.


-- System Information:
Debian Release: 13.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'proposed-updates-debug'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.48+deb13-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_IN, LC_CTYPE=en_IN (charmap=UTF-8), LANGUAGE=en_IN:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages luanti depends on:
ii  libc6                      2.41-12
ii  libcurl4t64                8.14.1-2
ii  libfreetype6               2.13.3+dfsg-1
ii  libgcc-s1                  14.2.0-19
ii  libgl1                     1.7.0-1+b2
ii  libgmp10                   2:6.3.0+dfsg-3
ii  libjpeg62-turbo            1:2.1.5-4
ii  libjsoncpp26               1.9.6-3
ii  libleveldb1d               1.23-5+b2
ii  libluajit-5.1-2            2.1.0+openresty20250117-2
ii  libopenal1                 1:1.24.2-1
ii  libpng16-16t64             1.6.48-1
ii  libpq5                     17.6-0+deb13u1
ii  libprometheus-cpp-core1.0  1.0.2-2+b3
ii  libprometheus-cpp-pull1.0  1.0.2-2+b3
ii  libspatialindex8           2.1.0-1
ii  libsqlite3-0               3.46.1-7
ii  libstdc++6                 14.2.0-19
ii  libvorbisfile3             1.3.7-3
ii  libx11-6                   2:1.8.12-1
ii  libxi6                     2:1.8.2-1
ii  libzstd1                   1.5.7+dfsg-1
ii  luanti-data                5.10.0+dfsg-5
ii  zlib1g                     1:1.3.dfsg+really1.3.1-1+b1

Versions of packages luanti recommends:
ii  luanti-game-minetest  5.8.0.40.gc7be7c1-3

Versions of packages luanti suggests:
pn  luanti-server            <none>
pn  minetest-mod-moreblocks  <none>
pn  minetest-mod-moreores    <none>
pn  minetest-mod-pipeworks   <none>
pn  minetestmapper           <none>

-- no debconf information