It looks like this was the issue:
https://gitlab.freedesktop.org/xorg/lib/libxau/-/commit/987fee49dc1750082cfe6e24833379233777a13b
** Also affects: libxau (Ubuntu)
Importance: Undecided
Status: New
** Changed in: libxau (Ubuntu Eoan)
Status: New => Fix Released
** Changed in: libxau (Ubuntu Focal)
Status: New => Fix Released
** Changed in: libxau (Ubuntu Bionic)
Status: New => Triaged
** Changed in: libxau (Ubuntu Bionic)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** Changed in: libxau (Ubuntu Bionic)
Status: Triaged => In Progress
** Changed in: libxau (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: libxau (Ubuntu Eoan)
Importance: Undecided => Medium
** Changed in: libxau (Ubuntu Focal)
Importance: Undecided => Medium
** No longer affects: gnome-shell (Ubuntu Bionic)
** No longer affects: gnome-shell (Ubuntu Eoan)
** No longer affects: gnome-shell (Ubuntu Focal)
** Changed in: gnome-shell (Ubuntu)
Status: Fix Released => Invalid
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https://bugs.launchpad.net/bugs/1559650
Title:
gnome-shell crashed with SIGSEGV in ___vsnprintf_chk()
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