bug#41627: 28.0.50; Emacs with cairo build segfault in HELLO file

[Eli Zaretskii]

> From: Zihao Zhu <all_but_last@163.com>
> Date: Sun, 31 May 2020 19:32:18 +0800
> 
> I try the Emacs build in commit 
> 780f674a82a90c4e3e32583059b498bfa57e4a06. When I eval
> 
> (set-frame-font "Sarasa Mono Slab SC" t)
> 
> then run M-x view-hello-file. Emacs segfault.
> 
> Sarasa Gothic: https://github.com/be5invis/Sarasa-Gothic
> 
> GDB attached backtrace in attachment.

Thanks.  can you show a backtrace from an unoptimized build (assuming
it also crashes in this case)?