Alas, my attempt to avoid bugs by moving with little load was not as fruitful as I hoped.
Siegeing my tiny httpd lasted for about an hour and then the gates gave way. With
dmesg the culprit was swiftly revealed.
[4361268.087988] moar: segfault at 3c8b ip 00007f86b426868b sp 00007f86aaff86b0 error 4 in libmoar.so[7f86b407b000+55d000]
A had the suspicion that close to 70000 tests will only get us the failure modes that are cought within minutes. Looks like there is quite some squashing left to do for the moar team.