Reported on wikimedia-operations: a 10% packet loss when trying to each from Voxel network text-lb.esams.wikimedia.org. The issue started the 2016-12-22 at 23:01:31 UTC.
The following stacktrace has been generated with packet lost only at Wikimedia side: http://pastebin.ubuntu.com/23671267/
This can be reproduced teaching text-lb.eqiad.wikimedia.org too.
According Icinga, all is fine for the text load balancers.