https://bugzilla.kernel.org/show_bug.cgi?id=200531
--- Comment #2 from Alexander Mezin (mezin.alexander@gmail.com) --- Also got "BUG: unable to handle kernel NULL pointer dereference". Happened when waking the display from suspend (the system itself wasn't suspended, because of https://bugzilla.kernel.org/show_bug.cgi?id=199959).
Seems that GUI becomes unresponsive after this, not after "REG_WAIT timeout".
Should I report this as a different bug?