On Sat, 2013-08-31 at 07:27 +0200, Mike Galbraith wrote: > The attached proggy (Manfred Spraul) is one reproducer. Just in case it's not obvious, the cause is spin_unlock_wait() usage. All it takes is one task to start the ball rolling while enough others exist to react by then taking the lock themselves, and you instantly get "Woohoo, let's all lock the lock we stare at to see if we need to lock the lock that we stare at.....". (loop doesn't look lovely for non-rt either, seems you could stimulate it if you tried it hard enough) -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
