On Fri, 17 Jul 2020, Zhiyi Zhang wrote: [...]
Looking at the source of XRRSetCrtcConfig(), it seems that it was waiting for a XReply that never came. And that xf86-video-qxl has no recent updates.
So my theory is that updated xorg-xserver or some other components had a race condition, and currently only manifests itself on TestBots.
The next step would be to investigate it on TestBots, and try an apt-get update. I am not sure what more can be done on my side.
Given that the TestBot VM is running Debian Testing it's possible that the update got a bad X server version. I will do an update tonight to see if that helps.
I grabbed the package list of debiant before and after the june upgrade for comparison. But the closest I get to relevant package upgrades are a bunch of OpenGL (libegl, libgl1, libgles2) and Mesa driver upgrades. Maybe I missed something.
2020-05-04 -> https://termbin.com/br19 2020-06-15 -> https://termbin.com/8cb9
I also checked for upgrades on the host but there was no upgrade between the 12th of june and the 10th of july.
The upgrade on the 12th was for the intel-microcode package.