On 6/27/19 10:26 PM, Thomas Gleixner wrote:
> Rong, Fengguang,
>
> On Wed, 26 Jun 2019, Rong Chen wrote:
>> On 6/25/19 7:32 PM, Thomas Gleixner wrote:
>>>> I have tested commit e0b179bc1a ("x86/apic/x2apic: Add conditional IPI
>>>> shorthands support"), the problem is still exist.
>>> the head of that branch is:
>>>
>>>         4f3f6d6a7f8e ("x86/apic/x2apic: Add conditional IPI shorthands
>>> support")
>>>
>>> This is WIP and force pushed. There are no incremental changes. Could you
>>> please check again?
>> The problem is still exist.
> I went through hoops and loops to get that lkp muck running, but as many
> different machines I tried on it never reproduced.
>
> So I need a bit of help from you folks. Can you please provide me:
>
>     1) The exact host kernel version
# uname -r
4.20.0


>     2) The config file

attached ("config-5.2.0-rc5-00003-ge1056a2")


>     3) The exact kvm-qemu version

# qemu-system-x86_64 --version
QEMU emulator version 3.1.0 (Debian 1:3.1+dfsg-8)
Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers


>
> Also it would be interesting whether 4f3f6d6a7f8e from that WIP.x86/ipi
> branch in tip has the same issue on other host machines.

yes. it has the same issue.


>
> Another data point would be whether it depends on a particular compiler
> version.

the issue could be reproduced too when built with gcc-8


>        
> Thanks in advance,
>
> 	tglx
>
> P.S: the instructions for reproducing the issue in that robot mail are
> incomplete because there is no information how to bring the module into
> that initrd... I somehow figured it out.

Thanks for the input, we'll improve the tips.

Best Regards,
Rong Chen