On Thu, 10 Jan 2008, Ingo Molnar wrote: > > FYI, I just hit this hang on 2.6.24-rc6 without any extra patches. So, > > unless 2.6.24-rc7 did anything to fix this issue, this is a high > > priority bug (IMHO). > > i'm wondering why this only triggered now. Is this something new in > 2.6.24?
It only triggeres with the switching of the idle governors. And not just one, you need to switch twice. The first loading of a governor does not call cpu_idle_wait, but the second one does. NO_HZ must also be enabled, plus this needs to happen when no events or threads are scheduled to run on a CPU, which limits this to boot up. Also, this only seems to happen on my 2x2 (4way) and only once in a while. I'm surprised that I'm the only one so far to report it. I can boot up the 2.6.23 kernel on this box to see if it also hangs sometimes. But, as I said, it may take several hundreds of tries to see it. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
