A gdb attached backtrace generated by Emacs build with CFLAGS=-O0 -g3 in attachment On 2020/5/31 下午10:54, Eli Zaretskii wrote: >> From: Zihao Zhu >> 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)?