Messages in this thread | | | Date | Wed, 24 Sep 2014 16:18:55 +0800 | From | Wanpeng Li <> | Subject | Re: [PATCH v5] x86, cpu-hotplug: fix llc shared map unreleased during cpu hotplug |
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于 9/24/14, 3:52 PM, Ingo Molnar 写道: > * Wanpeng Li <kernellwp@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.kani@hp.com> >>>> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> >>>> Tested-by: Linn Crosetto <linn@hp.com> >>>> Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com> >>> Reviewed-by: Borislav Petkov <bp@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.
Just send out the latest version.
Regards, Wanpeng Li
> > Thanks, > > Ingo
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