On Mon, 23 Feb 2015, Nicolas Pitre wrote: > On Mon, 23 Feb 2015, Peter Zijlstra wrote: > > > The reported function that fails: bL_switcher_restore_cpus() is called > > in the error paths of the former and the main path in the latter to make > > the 'stolen' cpus re-appear. > > > > The patch in question somehow makes that go boom. > > > > > > Now what all do you need to do to make it go boom? Just enable/disable > > the switcher once and it'll explode? Or does it need to do actual > > switches while it is enabled? > > It gets automatically enabled during boot. Then several switches are > performed while user space is brought up. If I manually disable it > via /sys then it goes boom.
OK. Forget the bL switcher. I configured it out of my kernel and then managed to get the same crash by simply hotplugging out one CPU and plugging it back in. $ echo 0 > /sys/devices/system/cpu/cpu2/online [CPU2 gone] $ echo 1 > /sys/devices/system/cpu/cpu2/online [Boom!] Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
