[$] A GPSD time warp
The GPSD project provides a
daemon for communicating with various GPS devices in order to retrieve the
location information that those sensors provide. But the GPS satellites
also provide highly accurate time information that GPSD can
extract for use by Network Time
Protocol (NTP) servers. A bug in the GPSD code will cause time to
go backward in October, though, which may well cause some havoc if affected NTP
servers do
not get an update before then.