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Date: Mon, 15 Sep 2014 09:32:25 +0800 From: Wanpeng Li <kernellwp@...il.com> To: Wanpeng Li <wanpeng.li@...ux.intel.com> CC: Ingo Molnar <mingo@...hat.com>, hpa@...or.com, Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, Borislav Petkov <bp@...en8.de>, Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>, David Rientjes <rientjes@...gle.com>, Prarit Bhargava <prarit@...hat.com>, Steven Rostedt <srostedt@...hat.com>, Jan Kiszka <jan.kiszka@...mens.com>, Toshi Kani <toshi.kani@...com>, linux-kernel@...r.kernel.org, Zhang Yang <yang.z.zhang@...el.com> Subject: Re: [PATCH v4] x86, hotplug: fix llc shared map unreleased during cpu hotplug Ping Ingo, HPA, PeterZ 于 14-9-4 下午5:34, Wanpeng Li 写道: > 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@...ux.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 majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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