Messages in this thread | | | Date | Tue, 16 Sep 2014 18:00:22 +0800 | From | Wanpeng Li <> | Subject | Re: [PATCH v4] x86, hotplug: fix llc shared map unreleased during cpu hotplug |
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于 14-9-16 下午5:01, Ingo Molnar 写道: > * Wanpeng Li <wanpeng.li@linux.intel.com> wrote: > >> 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.li@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? ;-) > Please send a fresh new version, maintainers trying to splice & > dice patches and changelogs is an unrobust approach prone to > mistakes.
Ok, I will send out a new version tomorrow. ;-)
Regards, Wanpeng Li
> > Thanks, > > Ingo > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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