Port access is not multi-fiber safe

The condition has 5 components:
 1. &error &serious
 2. &who
     who: put-u8
 3. &message
     message: "An unrecognized error was trapped"
 4. &irritants
     irritants: ((cmp rsi (mem64+ rcx -5))
                 (jnb (+ rip 188)))
 5. &program-counter
     program-counter: 2528013
End of condition components.

The above log gets hit when the web-server sample gets stress tested. In this case by:

siege -i -t2m -b -c 200 'http://localhost:3000'

Guessing this is to do with the syscall and unsafe side of things.