I0318 11:44:24.945091 1247437 blender_python.cpp:194] Debug flags initialized to:
CPU flags:
  AVX2       : True
  AVX        : True
  SSE4.1     : True
  SSE3       : True
  SSE2       : True
  BVH layout : EMBREE
  Split      : False
CUDA flags:
  Adaptive Compile : False
OptiX flags:
  CUDA streams : 1
OpenCL flags:
  Device type    : ALL
  Debug          : False
  Memory limit   : 0
Switching to fully guarded memory allocator.
Blender 2.93.0 Alpha
Build: 2021-03-18 15:36:36 Linux Release
argv[0] = ./blender
argv[1] = --debug
argv[2] = --debug-cycles
Read prefs: /home/mcc/.config/blender/2.93/config/userpref.blend
read file 
  Version 280 sub 39 date unknown hash unknown
Read blend: /media/mcc/Data/projects/art-3d/crash_compositor_group_node.blend
read file /media/mcc/Data/projects/art-3d/crash_compositor_group_node.blend
  Version 293 sub 11 date 2021-03-16 14:03 hash 4ca8e09b24de
Writing: /tmp/crash_compositor_group_node.crash.txt