kbl system hang under compositing

GPU and the entire machine occasionally hang. Opening a project in Intellij in particular seems to provoke the hang when it starts syntax colouring.

If I disable compositing, the system is stable with the same workflow.

Kernel 5.6.0-rc3-1-drm-tip-git-g58d4ab7db0e7 from ArchLinux linux-drm-tip-git /https://aur.archlinux.org/linux-drm-tip-git.git/

sudo cat /sys/class/drm/card0/error:

No error state collected

logs with drm debug enabled: kernel_log.gz