Bug#903934: regression: 3.16.57-2 fails to boot libvirt guests on Xeon E3-1225

From	Chenwqin <chenwqin@gmail.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#903934: regression: 3.16.57-2 fails to boot libvirt guests on Xeon E3-1225
Date	2018-07-30 04:50 +0200
Message-ID	<wh6pY-1XN-3@gated-at.bofh.it> (permalink)
References	<wciUN-ad-5@gated-at.bofh.it> <wciUN-ad-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, 16 Jul 2018 21:57:19 +0100 =?ISO-8859-1?Q?Fran=E7ois?= Guerraz <kubrick@fgv6.net> wrote:
> Package: src:linux
> Version: 3.16.57-2
> Severity: important
> 
> 
> After upgrading linux-image-3.16.0-6-amd64 (3.16.57-2) over (3.16.56-
> 1+deb8u1) on a VM host and its guests, the guests were not able to
> boot-up any more (see Guest Kernel Log below).
> 
> I found a workaround which is to change the cpu of the host from 
>   <cpu mode='host-model'>
>     <model fallback='allow'/>
>   </cpu>
> to
>   <cpu mode='custom' match='exact'>
>     <model fallback='allow'>SandyBridge</model>
>   </cpu>
[...]

We have the same problem. And the guests were not able to boot-up no matter the vm host had installed the current intel-microcode or not. Guests will reboot immediately after boot message showing 'Booting SMP configuration'

** Guest Kernel log:
[    0.302539] x86: Booting SMP configuration:
[    0.302541] .... node  #1, CPUs:          #1


Some Workaround we found:
1. Start the guest with nosmp kernel option or only one cpu config, it can do a normal boot-up.
2. Downgrade the vm host kernel version or Downgrade the guest kernel, Both of them work. 
2. Change the cpu type of guest to custom. It also works.
  <cpu mode='host-model'>
    <model fallback='allow'/>
  </cpu>
to
  <cpu mode='custom' match='exact'>
    <model fallback='allow'>SandyBridge</model>
  </cpu>

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Bug#903934: regression: 3.16.57-2 fails to boot libvirt guests on Xeon E3-1225 François Guerraz <kubrick@fgv6.net> - 2018-07-16 23:10 +0200
  Bug#903934: regression: 3.16.57-2 fails to boot libvirt guests on Xeon E3-1225 Ben Hutchings <ben@decadent.org.uk> - 2018-07-17 02:10 +0200
    Bug#903934: regression: 3.16.57-2 fails to boot libvirt guests on Xeon E3-1225 François Guerraz <kubrick@fgv6.net> - 2018-07-17 09:50 +0200
  Bug#903934: regression: 3.16.57-2 fails to boot libvirt guests on Xeon E3-1225 Chenwqin <chenwqin@gmail.com> - 2018-07-30 04:50 +0200

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