On Thu, 6 Mar 2014 08:08:32 +0100 Ingo Molnar <mi...@kernel.org> wrote:
> > * Igor Mammedov <imamm...@redhat.com> wrote: > > > Master CPU may timeout before cpu_callin_mask is set and cancel > > booting CPU, but being onlined CPU still continues to boot, sets > > cpu_active_mask (CPU_STARTING notifiers) and spins in > > check_tsc_sync_target() for master cpu to arrive. Following attempt > > to online another cpu hangs in stop_machine, initiated from here: > > The changelog needs to prominently contain a description of the > practical relevance of this patch: has the hang triggered on any > system and under what circumstances, and did the patch resolve the > hang, etc.? Hang is observed on virtual machines during CPU hotplug, especially in big guests with many CPUs. (It happens more often if host is over-committed). Similar patch is carried in RHEL6 since 2012 and it fixes issue there, when applied to upstream kernel it also fixes issue. > > Thanks, > > Ingo Thanks, Igor. -- 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/
