How to debug a segfault with OCaml 5.1

[gadmm]

To add to @kayceesrk’s good suggestion, there is an unknown number (but AFAIR greater than a dozen) of packages on opam that use naked pointers but have been marked as compatible with OCaml 5, and which show up as green in the CI.

I posted below a simple method to see if one idiom which creates naked pointers is present inside your dependencies (adapted for opam, but it adapts to other packaging method):

Nnpchecker error–how to debug?

Here is a non-complete method. It only catches some uses of naked pointers, but some that seem to be common. Download the source of all dependencies, with something like:opam install --download-only dream Grep the sources for all possible (value) casts in C files:grep -r --include \*.h --include \*.c -e "(value)" _opam/.opam-switch/sources/ Carefully audit the results to see if any of those creates a naked pointer. Here it seems that ocaml-ssl creates a naked pointer in the C function oca…

The usefulness of the compile-time option to detect possible naked pointers at runtime (badly named nnp “checker”) seems relative.