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
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https://bugs.launchpad.net/bugs/1834984
Title:
gnome-shell freezes with 100% CPU when closing popup window
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