"ping request inconclusive due to errors" in healthy ring

[dansimau]

I am seeing a lot of log warnings like:

{"errors":null,"level":"warning","local":"172.18.25.93:55435","msg":"ping request inconclusive due to errors","numErrors":0,"ringpop":"ringpopd-go","target":"172.18.25.93:56203","time":"2015-11-19T10:09:55+01:00"}
{"errors":null,"level":"warning","local":"172.18.25.93:55435","msg":"ping request inconclusive due to errors","numErrors":0,"ringpop":"ringpopd-go","target":"172.18.25.93:56203","time":"2015-11-19T10:09:57+01:00"}
{"errors":null,"level":"warning","local":"172.18.25.93:55435","msg":"ping request inconclusive due to errors","numErrors":0,"ringpop":"ringpopd-go","target":"172.18.25.93:56203","time":"2015-11-19T10:09:59+01:00"}
{"errors":null,"level":"warning","local":"172.18.25.93:55435","msg":"ping request inconclusive due to errors","numErrors":0,"ringpop":"ringpopd-go","target":"172.18.25.93:56203","time":"2015-11-19T10:10:01+01:00"}
{"errors":null,"level":"warning","local":"172.18.25.93:55435","msg":"ping request inconclusive due to errors","numErrors":0,"ringpop":"ringpopd-go","target":"172.18.25.93:56203","time":"2015-11-19T10:10:02+01:00"}
{"errors":null,"level":"warning","local":"172.18.25.93:55435","msg":"ping request inconclusive due to errors","numErrors":0,"ringpop":"ringpopd-go","target":"172.18.25.93:56203","time":"2015-11-19T10:10:04+01:00"}
{"errors":null,"level":"warning","local":"172.18.25.93:55435","msg":"ping request inconclusive due to errors","numErrors":0,"ringpop":"ringpopd-go","target":"172.18.25.93:56203","time":"2015-11-19T10:10:06+01:00"}

This is occurring in a healthy ring:

$ ringpop-admin status 172.18.25.93:55435 
 172.18.25.93:55435   alive 
 172.18.25.93:56203   alive 
$ 

It looks like this message is being printed whether there are errors collected or not (note that len(errs) is 0 in the message).