@mflatt hmm…It looks like having the custodian manage the proc that calls close is good enough:

https://github.com/LeifAndersen/racket-video/blob/segfault/video/init.rkt

Specifically, this seems to segfault when the package is installed with raco setup

I gave the custodian the proc so it wouldn’t get GCed: (scheme_add_managed_close_on_exit #f free-proc free-proc #f)

I should also note that when run directly or the scribble file tha crashes it in raco setup runs that I don’t get a segfault, which does seem like a GC related issue to me.