I tried building this package 50 times in different autobuilders (QEMU/KVM machines with a single CPU), using sbuild.
This is the result: Status: successful elki_0.7.1-2_amd64-20161103T131214Z Status: failed elki_0.7.1-2_amd64-20161103T131205Z Status: successful elki_0.7.1-2_amd64-20161103T131203Z Status: successful elki_0.7.1-2_amd64-20161103T131211Z Status: successful elki_0.7.1-2_amd64-20161103T131208Z Status: failed elki_0.7.1-2_amd64-20161103T131604Z Status: successful elki_0.7.1-2_amd64-20161103T132010Z Status: failed elki_0.7.1-2_amd64-20161103T132209Z Status: failed elki_0.7.1-2_amd64-20161103T131706Z Status: successful elki_0.7.1-2_amd64-20161103T132036Z Status: failed elki_0.7.1-2_amd64-20161103T132327Z Status: successful elki_0.7.1-2_amd64-20161103T132155Z Status: failed elki_0.7.1-2_amd64-20161103T132745Z Status: failed elki_0.7.1-2_amd64-20161103T132517Z Status: failed elki_0.7.1-2_amd64-20161103T132906Z Status: failed elki_0.7.1-2_amd64-20161103T133151Z Status: failed elki_0.7.1-2_amd64-20161103T133323Z Status: failed elki_0.7.1-2_amd64-20161103T133137Z Status: successful elki_0.7.1-2_amd64-20161103T133142Z Status: failed elki_0.7.1-2_amd64-20161103T133443Z Status: successful elki_0.7.1-2_amd64-20161103T132909Z Status: successful elki_0.7.1-2_amd64-20161103T133552Z Status: successful elki_0.7.1-2_amd64-20161103T133853Z Status: successful elki_0.7.1-2_amd64-20161103T133705Z Status: failed elki_0.7.1-2_amd64-20161103T133945Z Status: failed elki_0.7.1-2_amd64-20161103T134243Z Status: failed elki_0.7.1-2_amd64-20161103T134529Z Status: failed elki_0.7.1-2_amd64-20161103T134342Z Status: successful elki_0.7.1-2_amd64-20161103T134638Z Status: failed elki_0.7.1-2_amd64-20161103T134345Z Status: failed elki_0.7.1-2_amd64-20161103T134808Z Status: successful elki_0.7.1-2_amd64-20161103T134712Z Status: failed elki_0.7.1-2_amd64-20161103T135056Z Status: successful elki_0.7.1-2_amd64-20161103T135408Z Status: successful elki_0.7.1-2_amd64-20161103T135219Z Status: failed elki_0.7.1-2_amd64-20161103T135326Z Status: failed elki_0.7.1-2_amd64-20161103T135633Z Status: failed elki_0.7.1-2_amd64-20161103T135910Z Status: failed elki_0.7.1-2_amd64-20161103T140137Z Status: failed elki_0.7.1-2_amd64-20161103T135617Z Status: failed elki_0.7.1-2_amd64-20161103T140200Z Status: successful elki_0.7.1-2_amd64-20161103T135710Z Status: failed elki_0.7.1-2_amd64-20161103T140253Z Status: failed elki_0.7.1-2_amd64-20161103T140459Z Status: successful elki_0.7.1-2_amd64-20161103T140736Z Status: failed elki_0.7.1-2_amd64-20161103T140724Z Status: successful elki_0.7.1-2_amd64-20161103T140839Z Status: successful elki_0.7.1-2_amd64-20161103T140908Z Status: failed elki_0.7.1-2_amd64-20161103T140826Z Status: successful elki_0.7.1-2_amd64-20161103T141202Z If you downgraded this because it "does not fail often enough", I wonder what's the "threshold" for you to consider a random failure to be RC. (But I don't think we should be using "thresholds" for this at all. Packages must build ok 100% of the time). Thanks.