Celery 3.1.25 sometimes falls over on my Windows system. I am running this with billiard 3.3.023.
Here’s what appears in my Celery log file:
[2019-07-26 09:06:48,473: ERROR/MainProcess] Task remapp.netdicom.qrscu.qrscu[a389bc34-3014-4022-81cb-ae08e7cb5685] raised unexpected: Terminated(-15,) Traceback (most recent call last): File "d:\server_apps\python27\lib\site-packages\billiard\pool.py", line 1678, in _set_terminated raise Terminated(-(signum or 0)) Terminated: -15
Once this has happened Celery fails and no more tasks are processed (they build up in the queue).
I will switch on debug and wait for it to happen again to shed a bit more light.