On 2015/8/25 21:48, kernel test robot wrote:
> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> 
> commit 991de2e59090e55c65a7f59a049142e3c480f7bd
> Author:     Jiang Liu <jiang.liu@linux.intel.com>
> AuthorDate: Wed Jun 10 16:54:59 2015 +0800
> Commit:     Bjorn Helgaas <bhelgaas@google.com>
> CommitDate: Thu Jul 30 14:05:57 2015 -0500
> 
>     PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()
>     
>     To support IOAPIC hotplug, we need to allocate PCI IRQ resources on demand
>     and free them when not used anymore.
>     
>     Implement pcibios_alloc_irq() and pcibios_free_irq() to dynamically
>     allocate and free PCI IRQs.
>     
>     Remove mp_should_keep_irq(), which is no longer used.
>     
>     [bhelgaas: changelog]
>     Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
>     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>     Acked-by: Thomas Gleixner <tglx@linutronix.de>

Hi Bjorn and Fengguang,
	I have tracked down this regression, it's caused by a flaw
in ACPI BIOS implementation, and I have a draft patch for it.
I will send out the patch after v4.3-rc1 is out with more testings.
Thanks!
Gerry