Second Life rolling restart failure

Today's rolling restart of Second Life simulators to a new software version suffered a setback when a "potentially significant" performance problem was identified. Thought the nature of the problem hasn't been identified, Linden Lab considers it severe enough to back off the restart, and roll simulators back to the previous version.

As of 7:20PM SLT (US Pacific) the software reversions were complete, and work had commenced on an unknown number of simulators that were not operating at all.