Hi, I'm getting lots of this since upgrading from 2.2.9 to 3.0.11:
Tue Jun 21 15:21:11 2016 : WARNING: (16279306) WARNING: Module rlm_detail became unblocked for request 16279306 Tue Jun 21 15:21:11 2016 : WARNING: (16279309) WARNING: Module rlm_detail became unblocked for request 16279309 Tue Jun 21 15:21:12 2016 : WARNING: (16279322) WARNING: Module rlm_preprocess became unblocked for request 16279322 Tue Jun 21 15:21:13 2016 : WARNING: (16279341) WARNING: Module rlm_preprocess became unblocked for request 16279341 Tue Jun 21 15:21:14 2016 : WARNING: (16279362) WARNING: Module rlm_detail became unblocked for request 16279362 Tue Jun 21 15:21:20 2016 : WARNING: (16279468) WARNING: Module rlm_preprocess became unblocked for request 16279468 Tue Jun 21 15:21:23 2016 : WARNING: (16279506) WARNING: Module rlm_preprocess became unblocked for request 16279506 Tue Jun 21 15:23:38 2016 : WARNING: (16281993) WARNING: Module rlm_preprocess became unblocked for request 16281993
The only reference I found was for rlm_sql, where the OP was told that his SQL server is too slow, which is comprehensible. I don't see how rlm_detail or rlm_preprocess could be too slow, though, especially since there were merely 10 requests/s at this time.