[pavpanchekha]

In the interaction between FFI, GC, and hash tables, so yes, in the FFI itself, not in particular bindings:

https://github.com/racket/racket/issues/2702

https://github.com/racket/racket/issues/2263

There were workarounds (in Racket you can instruct the GC not to move your FFI objects) and I believe the underlying issues have been fixed.

I must add that I got immediate and comprehensive support from the core developers, who not only fixed the bug but also suggested the workaround (so I could continue to support all our target versions of Racket).

[neilv]

Thank you for your great bug report on this, and I'm glad to see it was in good hands.