I just installed chromium-86.0.4240.111p0 on amd64-current and hit the errors others have also reported. I got an empty window and a bit later another one with a title complaining about the unresponsive original window. Both of them were empty, so I only guess from their titles. A kill-restart roundtrip has helped, but this feels wrong.
Here's what I have in ~/.xsession-errors: XMonad recompilation process exited with success! user error (Error in function getWindowAttributes) user error (Error in function getWindowAttributes) user error (Error in function getWindowAttributes) user error (Error in function getWindowAttributes) libGL error: MESA-LOADER: failed to retrieve device information libGL error: Version 4 or later of flush extension not found libGL error: failed to load driver: i915 libGL error: failed to open /dev/drm0: No such file or directory libGL error: failed to load driver: i965 libGL error: MESA-LOADER: failed to open swrast (search paths /usr/X11R6/lib/modules/dri) libGL error: failed to load driver: swrast [82116:-766446528:1029/193828.945589:ERROR:bus.cc(393)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix") [82116:-766446528:1029/193828.946543:ERROR:bus.cc(393)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix") [82116:-766446528:1029/193829.198310:ERROR:bus.cc(393)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix") [82116:-766446528:1029/193829.198630:ERROR:bus.cc(393)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix") [82116:-1790247360:1029/193829.959809:ERROR:bus.cc(393)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory [82116:-1790247360:1029/193829.959954:ERROR:bus.cc(393)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory [82116:-1790247360:1029/193829.960124:ERROR:bus.cc(393)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory [82116:-1790247360:1029/193829.960209:ERROR:bus.cc(393)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory [82116:-1790247360:1029/193829.960305:ERROR:bus.cc(393)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory user error (Error in function getWindowAttributes) user error (Error in function getWindowAttributes) Thanks Greg