Very rare crash due to error: string with NUL passed to StringToUTF16

[HouzuoGuo]

The error occurs on windows exclusively and happens rarely. There is no clue as to what triggers the error - it may happen as soon as daemons are started or as late as after hundreds of hours of uptime. The error leads to a panic which is subsequently recovered by supervisor.

Unfortunately supervisor for some reason won't capture the entire stack trace, and the only clue so far is an error simply stating "string with NUL passed to StringToUTF16".

[HouzuoGuo]

Taking a closer look at supervisor's email notification, there is actually minimal clue about the function leading to the crash, though it does not show detailed stack trace:

panic: net.(*Resolver).lookupIP.func1panic: syscal:30:48 goroutine 11286 [running]:

[HouzuoGuo]

Resolved by 0259b98