Portal 2 for Linux crashes on Debian Bookworm on launch

[PinkFreud]

Launching Portal 2 natively for Linux causes a crash in client.so:

Thread 1 "portal2_linux" received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
--Type <RET> for more, q to quit, c to continue without paging--
Argument list to give program being debugged when it is started is "-game portal2".
(gdb) bt
#0  0x00000000 in ?? ()
#1  0xc29459ee in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/portal2/bin//linux32/client.so
#2  0xc297ec2d in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/portal2/bin//linux32/client.so
#3  0xc297ef9a in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/portal2/bin//linux32/client.so
#4  0xc2bdb350 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/portal2/bin//linux32/client.so
#5  0xe063f223 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/linux32/vguimatsurface.so
#6  0xe063f223 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/linux32/vguimatsurface.so
#7  0xe063f223 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/linux32/vguimatsurface.so
#8  0xe063f223 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/linux32/vguimatsurface.so
#9  0xe063f29e in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/linux32/vguimatsurface.so
#10 0xf4728f5f in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/vgui2.so
#11 0xe2a8f6bd in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#12 0xe2968ba1 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#13 0xe2979541 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#14 0xe297b126 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#15 0xe2993d60 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#16 0xe2994046 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#17 0xe2994129 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#18 0xe2a79a8f in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#19 0xe2a760bd in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#20 0xe2a761dd in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#21 0xe2ae35b0 in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#22 0xe2a778df in ?? () from /media/steamapps/Steam/steamapps/common/Portal 2/bin/engine.so
#23 0xf7d1e519 in ?? () from bin/linux32/launcher.so
#24 0xf7d1e519 in ?? () from bin/linux32/launcher.so
#25 0xf7d01408 in LauncherMain () from bin/linux32/launcher.so
#26 0x56557957 in main (argc=3, argv=0xffffcc84) at /code/Perforce/Valve/portal2/rel_pc/src/launcher_main/main.cpp:728
(gdb) 

The game doesn't make it to the main menu - this crash occurs while on the Portal 2 title screen.

Game output at crash:

Convar r_flashlightscissor has conflicting FCVAR_CHEAT flags (child: no FCVAR_CHEAT, parent: has FCVAR_CHEAT, parent wins)
Convar r_flashlightscissor has conflicting FCVAR_CHEAT flags (child: no FCVAR_CHEAT, parent: has FCVAR_CHEAT, parent wins)

WARNING: unable to link find and find because one or more is a ConCommand.
WARNING: unable to link find and find because one or more is a ConCommand.


 ##### swap interval = -1     swap limit = 1 #####
Did not detect any valid joysticks.
Did not detect any valid joysticks.

CClientSteamContext logged on = 1
CClientSteamContext logged on = 1

Convar building_cubemaps has conflicting FCVAR_CHEAT flags (child: has FCVAR_CHEAT, parent: no FCVAR_CHEAT, parent wins)
Convar building_cubemaps has conflicting FCVAR_CHEAT flags (child: has FCVAR_CHEAT, parent: no FCVAR_CHEAT, parent wins)

Game.dll loaded for "Half-Life 2"
Game.dll loaded for "Half-Life 2"

crash_20250214120856_2.dmp[3603269]: Uploading dump (out-of-process)
/tmp/dumps/crash_20250214120856_2.dmp
./portal2.sh: line 51: 3603192 Segmentation fault      ${GAME_DEBUGGER} "${GAMEROOT}"/${GAMEEXE} "$@"

System information:

CPU: AMD Ryzen 7 5700X 8-Core Processor
Distribution: Debian Bookworm (12)
Desktop: XFCE
GPU: PowerColor Radeon RX 6700XT
Driver: amdgpu