Hi Ingo, On Thu, Sep 04, 2014 at 04:56:41PM +0800, Wanpeng Li wrote: >On Thu, Sep 04, 2014 at 07:20:34AM +0200, Ingo Molnar wrote: >> >>* Wanpeng Li <wanpeng...@linux.intel.com> 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 >>> >>> 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. >> >>Very little is said in this changelog about how the bug was >>found, how likely it is to occur for others, what systems are >>affected, etc. > >This bug can be triggered by hot add and remove large number of xen >domain0's vcpus repeated. >
If I need to send a new version of the patch or you can pick the patch w/ the updated changelog for me? ;-) Regards, Wanpeng Li >Regards, >Wanpeng Li > >> >>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/
