Thanks for the bug report. I am fairly confident this will be a duplicate of bug 1834583, but just to verify please run:
apport-cli --hanging -u 1834984 -P PID where PID is the process ID of the busy gnome-shell. ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1834984 Title: gnome-shell freezes with 100% CPU when closing popup window To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1834984/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs