Failed creating handler

Hi, I'm running FreeRADIUS 2.1.11 on Gentoo compiled with specific patches (qafixes, versionless, pkglibdir) and a small patch of my own (byminute, adds an extra var in xlat.c, nothing big). I'm experiencing a weird crash of which I've found absolutely nothing online: "Failed creating handler". Source code says this one comes from src/main/event.c when calling fr_event_insert() but I can't figure out anything else. The server does decoupled accounting, one site has only one module in accounting, rlm_detail and the other listens on the detail logs with only one module in accounting, rlm_python. cleanup_delay is 5, max_requests 10240, 16 threads, max_requests_per_server = 1500 Any idea what could be the problem? tx, amne