SimpleDiskAndNetworkTest hangs after terminating the runtime

I observed the SimpleDiskAndNetworkTest hang with only the main thread left waiting on the successSem in the test-runner's main.

It is reproducable for me on master consistently using release builds and eventually using debugoptimized with a mmaped log file.

Steps to reproduce

make release
meson test -C build SimpleDiskAndNetworkTest --repeat=10

First observed

I remember seeing it somewhere in our CI but I can not find it anymore.