Upscale Image (using Model) crashes before sending output

My batch image upscale is crashing just prior to sending the output to the next node. ComfyUI crashes without outputting any error messages. My usage situation follows:

140 frames
576 x 576 res 16bit pngs
4x_NMKD-Siax_200k.pth upscaler
standalone workflow (no SD models loaded, just a plain pixel space upscaling workflow after a system reboot)


Terminal output:

got prompt
[rgthree] Using rgthree's optimized recursive execution.
[rgthree] First run patching recursive_output_delete_if_changed and recursive_will_execute.
[rgthree] Note: If execution seems broken due to forward ComfyUI changes, you can disable the optimization from rgthree settings in ComfyUI.
got prompt
got prompt
got prompt
./comfy.sh: line 5: 8152 Killed python main.py --auto-launch --listen --fp32-vae