* Wanpeng Li <kernel...@gmail.com> wrote: > > 于 14-9-23 下午5:37, Borislav Petkov 写道: > >On Wed, Sep 17, 2014 at 03:17:52PM +0800, Wanpeng Li wrote: > >>BUG: unable to handle kernel NULL pointer dereference at 0000000000000004 > >>IP: [..] find_busiest_group > >>PGD 5a9d5067 PUD 13067 PMD 0 > >>Oops: 0000 [#3] SMP > >>[...] > >>Call Trace: > >>load_balance > >>? _raw_spin_unlock_irqrestore > >>idle_balance > >>__schedule > >>schedule > >>schedule_timeout > >>? lock_timer_base > >>schedule_timeout_uninterruptible > >>msleep > >>lock_device_hotplug_sysfs > >>online_store > >>dev_attr_store > >>sysfs_write_file > >>vfs_write > >>SyS_write > >>system_call_fastpath > >> > >>This bug can be triggered by hot add and remove large number of xen > >>domain0's vcpus repeatedly. > >> > >>Last level cache shared map is built during cpu up and build sched domain > >>routine takes advantage of it to setup sched domain cpu topology, however, > >>llc shared map is unreleased during cpu disable which lead to invalid sched > >>domain cpu topology. This patch fix it by release llc shared map correctly > >>during cpu disable. > >> > >>Reviewed-by: Toshi Kani <toshi.k...@hp.com> > >>Reviewed-by: Yasuaki Ishimatsu <isimatu.yasu...@jp.fujitsu.com> > >>Tested-by: Linn Crosetto <l...@hp.com> > >>Signed-off-by: Wanpeng Li <wanpeng...@linux.intel.com> > >Reviewed-by: Borislav Petkov <b...@suse.de> > > > > Thanks. > > > Ingo, Peter Z, HPA, > > > Could this patch catch up with 3.18 merge window?
Please also add the real-hardware reports to the changelog. Thanks, Ingo -- 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/