trouble with "error: event_add failed. in cpsl."

[A. Schulze]

A. Schulze via Unbound-users:

> Am 24.05.19 um 16:09 schrieb A. Schulze via Unbound-users:
>
>> unbound-1.9.1 with moderate load 1k queries/s peak
>>
>> after restart everything works fine but after some ours the log is  
>> flooded wthis way:
>>
>> 2019-05-24 15:49:53.874400500 [1558705793] unbound[33794:3] error:  
>> event_add failed. in cpsl.
>> 2019-05-24 15:49:53.888628500 [1558705793] unbound[33794:3] error:  
>> event_add failed. in cpsl.
>
> These messages continue even if no new requests arrive.
>
> After downgrade to 1.8.1 with an unchanged configuration file the  
> problem went away.
> I'll give 1.9.2 a try once it's available.

I replaced 1.8.1 (known to work) with 1.9.2~rc3 on one server that  
"run crazy" with 1.9.1,
At least over 3 days I did not noticed the log message mentioned in  
$subject - fine.

There are numerous changes between 1.8.1/utils/netevent.c,  
1.9.1/utils/netevent.c
(that may introduce the failure I saw) and 1.9.2/utils/netevent.c
(that may solve the issue again)
Does this sound reasonable?

Andreas