G'day. I've come across a crash during GC on macOS 10.15.2, GNU Emacs built from source, git d97a77c481ec913d8c3c24f2eecdc41a28243678.
The crash is located at:
...->mark_window->mark_vectorlike->mark_frame
In this the bad pointer is in (struct frame).output_data.ns.font, where the pointer is wildly out of the memory map, and so crashes trying to determine if that was marked.
I haven't yet tracked this down to a root cause, but before I invest significant time in that I'd like to know if anyone else is investigating this, or something similar to this?
Reproduction is, painfully, just a matter of waiting for a crash. It seems to be vaguely correlated to external process interactions, but can't find a clear root cause.
I'll work to get a fix, of course, but wanted to avoid duplicating work if someone else already has this in hand, or knows more.
Thanks!