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Date: Tue, 16 Sep 2014 11:01:12 +0200 From: Ingo Molnar <mingo@...nel.org> 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 * Wanpeng Li <wanpeng.li@...ux.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@...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? ;-) Please send a fresh new version, maintainers trying to splice & dice patches and changelogs is an unrobust approach prone to mistakes. 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/
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