[libunwind] is _dl_find_object thread safe to use in unwinding code?

I just find out this commit
https://www.mail-archive.com/cfe-commits@lists.llvm.org/msg292908.html

According to glibc documentation

https://sourceware.org/glibc/manual/2.42/html_node/Dynamic-Linker-Introspection.html

"
_dl_find_object itself is thread-safe. However, if the application invokes dlclose for the object that contains address concurrently with _dl_find_object or after the call returns, accessing the unwinding data for that object or the link map (through result->dlfo_link_map) is not safe. Therefore, the application needs to ensure by other means (e.g., by convention) that address remains a valid code address while the unwinding information is processed.
"

Start by reading the linked LLVM commit and glibc Dynamic Linker Introspection documentation, then inspect libunwind’s use of _dl_find_object. Determine whether concurrent dlclose can invalidate the unwinding data or link map during unwinding, and document the required synchronization or resulting change.

Written by the indexing model from the issue text.