When using fedora kernel version 6.3.6-200.fc38.x86_64, running any SystemTap script with IO will not terminate after Pass 5: starting run unless forced to.  

e.g.  
probe begin
{ print ("hello world\n")
exit () }


Upon downgrading to 6.2.15-300.fc38.x86_64 problem does not appear.
Possibly related to stapio.

Output of ps aux | grep stap
halamour    4241  0.1  0.0      0     0 pts/0    Zl   15:48   0:00 [stapio] <defunct>
halamour    4291  4.0  0.9 542516 300152 pts/0   S+   15:48   0:00 stap -v hello-world.stp
halamour    4292  0.1  0.0      0     0 pts/0    Zl+  15:48   0:00 [stapio] <defunct>
halamour    4358  0.0  0.0 222408  2176 pts/1    S+   15:49   0:00 grep --color=auto stap

Output of lsmod | grep stap
stap_b9eef644af3bff3c851557a1748735a_4292    77824  1
stap_b9eef644af3bff3c851557a1748735a_4241    77824  1