Go runtime spits messages on standard error?

[bortzmeyer]

Sometimes, the Icinga log files contains spurious messages:

[Wed Feb 6 21:29:24 2013]:44145: i/o timeout

which are probably generated by the Go runtime (the message returned to the user is "Cannot get SOA from ns4.ext.nic.fr./2001:67c:e0::4: read udp [2a01:e35:8bd9:8bb0:ba27:ebff:feba:9094]:51683: i/o timeout") and sent to the standard error (something a Nagios plugin must not do).