2021-02-03_07:59:13
To debug GPU crashes: -gpucrashdebugging
Unreal Engine 4.26 also added -vulkanbestpractices and -gpuvalidation.
Also -vulkanvalidation=5 and making sure you have a Vulkan SDK setup so the validation layers are there.
Usually a crash reporter will appear with some debug information, and it's possible to attach a debugger at this time.
If a crash is so bad that not even the crash reporter get a chance to do its thing one can enable core dumping.
Enable unlimited core dump file size in the shell from which Unreal Editor is started with ulimit -c unlimited.
Pass -core when running Unreal Editor.
Do whatever you need to do to reproduce the crash.
A core file will be created.
Open the core file with GDB: gdb UnrealEditor -c core
Not sure where the core file will be placed, may need to do find . -name core to find it.