Description of problem:
I'm using a Fedora 38 KDE Plasma installation with mesa-va-drivers-freeworld-0:23.0.1-1.fc38 installed from rpm fusion. I updated the system with updates-testing enabled using sudo dnf offline-upgrade download and sudo dnf offline-upgrade reboot
The update included the llvm-16.0.0-2.fc38 update at https://bodhi.fedoraproject.org/updates/FEDORA-2023-3a602914f6

I started Firefox 111.0.1 on Wayland a few times in Plasma 5.27.3. Crash notifications were shown each time I started Firefox. A Firefox child process crashed in llvm::Target::createTargetMachine

Core was generated by `/usr/lib64/firefox/firefox --name firefox-wayland'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  llvm::Target::createTargetMachine (this=0x0, TT=..., CPU=..., Features=..., Options=..., RM=..., 
    CM=..., OL=llvm::CodeGenOpt::Default, JIT=<optimized out>)
    at /usr/src/debug/llvm15-15.0.7-4.fc38.x86_64/include/llvm/MC/TargetRegistry.h:476
476         if (!TargetMachineCtorFn)

The pointer this was null in frame #0 and the pointer T was null in frame #1. TargetMachineCtorFn on the crashing line was at an inaccessible address 0x60.
(gdb) p TargetMachineCtorFn
Cannot access memory at address 0x60

The crash involved loading the radeonsi VA-API video driver from mesa-va-drivers-freeworld-0:23.0.1-1.fc38. The system has an integrated AMD Radeon R5 GPU using the radeonsi mesa driver and amdgpu kernel driver.

Version-Release number of selected component:
firefox-111.0.1-1.fc38

Additional info:
reporter:       libreport-2.17.9
cmdline:        /usr/lib64/firefox/firefox --name firefox-wayland
rootdir:        /
executable:     /usr/lib64/firefox/firefox
cgroup:         0::/user.slice/user-1000.slice/user/app.slice/app-firefox\x2dwayland-c88dd652e871452eb75eeaae53e25550.scope
type:           CCpp
kernel:         6.2.9-300.fc38.x86_64
runlevel:       N 5
journald_cursor: s=14e52130f49f48e58fb008916da3369c;i=35222a;b=7bbc879fc4704435b47c628341bc6e9d;m=2d7aed2b;t=5f88a477eb1fb;x=fbedf576ecb61527
package:        firefox-111.0.1-1.fc38
backtrace_rating: 4
uid:            1000
crash_function: llvm::Target::createTargetMachine(llvm::StringRef, llvm::StringRef, llvm::StringRef, llvm::TargetOptions const&, llvm::Optional<llvm::Reloc::Model>, llvm::Optional<llvm::CodeModel::Model>, llvm::CodeGenOpt::Level, bool) const
reason:         firefox killed by SIGSEGV

Truncated backtrace:
Thread no. 1 (24 frames)
 #0 llvm::Target::createTargetMachine(llvm::StringRef, llvm::StringRef, llvm::StringRef, llvm::TargetOptions const&, llvm::Optional<llvm::Reloc::Model>, llvm::Optional<llvm::CodeModel::Model>, llvm::CodeGenOpt::Level, bool) const at /usr/src/debug/llvm15-15.0.7-4.fc38.x86_64/include/llvm/MC/TargetRegistry.h:476
 #1 LLVMCreateTargetMachine(LLVMTargetRef, char const*, char const*, char const*, LLVMCodeGenOptLevel, LLVMRelocMode, LLVMCodeModel) at /usr/src/debug/llvm15-15.0.7-4.fc38.x86_64/lib/Target/TargetMachineC.cpp:146
 #2 ac_create_target_machine at ../src/amd/llvm/ac_llvm_util.c:204
 #3 ac_init_llvm_compiler at ../src/amd/llvm/ac_llvm_util.c:309
 #4 si_init_compiler at ../src/gallium/drivers/radeonsi/si_pipe.c:153
 #5 radeonsi_screen_create_impl at ../src/gallium/drivers/radeonsi/si_pipe.c:1171
 #6 amdgpu_winsys_create at ../src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c:579
 #7 radeonsi_screen_create at ../src/gallium/drivers/radeonsi/si_pipe.c:1506
 #8 pipe_radeonsi_create_screen at ../src/gallium/auxiliary/target-helpers/drm_helper.h:222
 #9 pipe_loader_create_screen_vk at ../src/gallium/auxiliary/pipe-loader/pipe_loader.c:171
 #10 pipe_loader_create_screen at ../src/gallium/auxiliary/pipe-loader/pipe_loader.c:177
 #11 vl_drm_screen_create at ../src/gallium/auxiliary/vl/vl_winsys_drm.c:50
 #12 __vaDriverInit_1_18 at ../src/gallium/frontends/va/context.c:166
 #13 va_openDriver at ../va/va.c:522
 #14 vaInitialize at ../va/va.c:740
 #15 childvaapitest() at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/toolkit/xre/glxtest.cpp:1056
 #16 vaapitest at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/toolkit/xre/glxtest.cpp:1140
 #17 childgltest() at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/toolkit/xre/glxtest.cpp:1244
 #18 fire_glxtest_process() at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/toolkit/xre/glxtest.cpp:1286
 #19 XREMain::XRE_mainInit(bool*) at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/toolkit/xre/nsAppRunner.cpp:3961
 #21 XREMain::XRE_main(int, char**, mozilla::BootstrapConfig const&) at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/toolkit/xre/nsAppRunner.cpp:5825
 #22 XRE_main(int, char**, mozilla::BootstrapConfig const&) at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/toolkit/xre/nsAppRunner.cpp:5907
 #23 do_main(int, char**, char**) at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/browser/app/nsBrowserApp.cpp:226
 #24 main(int, char**, char**) at /usr/src/debug/firefox-111.0.1-1.fc38.x86_64/browser/app/nsBrowserApp.cpp:423