How to run the tests?

I run in qemu (compiled with USE_BPF=0):

root@x86_64:~/RPM/BUILD/stalld-1.19.3# echo -1 > /proc/sys/kernel/sched_rt_runtime_us
root@x86_64:~/RPM/BUILD/stalld-1.19.3# tests/test01 -vd
main:  testcpu: 19
set main affinity to not use cpu 19
main: starting blocker
main: starting blockee
main: waiting for blocker to exit

It then hangs there forever.