The list of loaded units is defined globally in flexdll.c:
and is accessed in parallel both by flexdll_*dlopen and flexdll_dlsym without using a lock. Adding locks around flexdll_*dlopen is straightforward, but symbol lookup operates a most-recently-used queue on the global, and the performance impact either of removing that or, worse, of putting a lock around flexdll_dlsym is less clear.
In the meantime, reverting ocaml/ocaml#11607 provides an easy test-case for demonstrating the failure (the test usually fails within a few runs)
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