The TIMER STRESS test in timer.impure.lisp schedules 200 timers for 1 second in the future, sleeps for 2 seconds, then asserts that the timer scheduler queue is empty. It appears that on OpenBSD, regardless of system speed, the kernel will only deliver up to 50 SIGALRMs per second. This means that after sleeping for 2 seconds there will still be about 150 timers in the queue and the stress test (as well as the following test) will fail. If the test is changed to sleep for 5 seconds then it will usually pass, but can still fail under moderate system load. Attached is a patch to sleep for 6 seconds on OpenBSD and 2 elsewhere.