On Mon, 2016-02-29 at 16:00 +0100, Thomas Gleixner wrote: > On Mon, 29 Feb 2016, Mike Galbraith wrote: > > > On Mon, 2016-02-29 at 13:46 +0100, Thomas Gleixner wrote: > > > Dear RT folks! > > > > > > I'm pleased to announce the v4.4.3-rt9 patch set. v4.4.2-rt7 and v4.4.3-rt8 > > > are non-announced updates to incorporate the linux-4.4.y stable tree. > > > > > > There is one change caused by the 4.4.3 update: > > > > > > The relaxed handling of dump_stack() on RT has been dropped as there is > > > actually a potential deadlock lurking around the corner. See: commit > > > d7ce36924344 upstream. This does not effect the other facilities which > > > gather stack traces. > > > > Hrm. I had rolled that dropped bit forward as below. I was given > > cause to do a very large pile of ltp oom4 testing (rt kernels will > > livelock due to waitqueue workers waiting for kthreadd to get memory to > > spawn a kworker thread, while stuck kworker holds manager mutex, unless > > workers are run as rt tasks to keep us from getting that depleted in > > the first place), which gives it oodles of exercise, and all _seemed_ > > well. Only seemed? > > Well, it will work nicely as long as you don't trigger a back trace in hard > irq context. Hmm? Poo.. that's a pretty darn good reason. Thanks. -Mike -- 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
