par_bridge_recursion test sometimes hanging indefinitely

I have noticed that there is one test that sometimes just gets "stuck" and hangs indefinitely (an hour or longer, depending on how patient I am with cancelling the build):

     Running `/builddir/build/BUILD/rayon-1.9.0/target/rpm/deps/par_bridge_recursion-fe4a8a5c3a55045a`
running 1 test
test par_bridge_recursion has been running for over 60 seconds

For example, the total build time for rayon 1.9.0 was 4-5 minutes on x86_64, i686, s390x, but on ppc64le, this test has been stuck for almost two hours now.

Build environment:

• Fedora Linux / Rawhide on ppc64le
• Rust 1.76.0
• distro-wide default RUSTFLAGS: -Copt-level=3 -Cdebuginfo=2 -Ccodegen-units=1 -Cstrip=none