Eli Zaretskii <eliz@gnu.org> writes:

> Please try with a non-existent font pattern.

Then I see it crashing.  But it doesn't crash immediately after hitting
C-x 5 2.  I get an "invalid font name" error message, and Emacs survives
some more seconds and then seems to crash after a random command,
e.g. after hitting C-SPC or <up>.

Here's a backtrace: