Firefox is spinning here with no end at 100% cpu on OS X: mozilla::net::nsSocketTransportService::Run() mozilla::net::nsSocketTransportService::DoPollIteration() mozilla::net::nsSocketTransportService::Poll() PR_Poll poll I don't know how to reproduce it

So this stopped and was fine for a while and then started again. (In the same session)

Did this just start happening today? Can you repro with a build from yesterday? This sounds a lot like bug 1415387 if it just started with today's nightly.

I haven't seen it before today. I don't have steps to reproduce so I can't say about yesterday.

Thanks. I'm going to go ahead and call this a dupe, then (all signs point that direction). I've landed a backout of the offending patch on inbound, so this should be fixed in the nightly built after that gets merged around. If this continues happening after a build with https://hg.mozilla.org/integration/mozilla-inbound/rev/cc25abc4eab682a2c9881cf0d81343bc28ef34f0 is available, we'll need to un-dupe this and take another look.