[Qemu-devel] [Bug 1308341] Re: Multiple CPUs causes blue screen on Windows guest (14.04 regression)

[Steve]

I was able to work around this by downgrading the kernel on a Ubuntu 14
box to 3.12.20-031220-generic #201405160935 (and of course wasn't seeing
this with Ubuntu 12).

I've periodically tried booting back to the standard Ubuntu 14 3.13
kernel to see if it's been fixed (and also tried 3.13-lowlatency) but I
get a W2k8R2 server hang with KVM within the first ~24 hours of boot
each time.

This is a dual-processor machine.  Also, with 3.13, I was getting these
messages on a semi-periodic basis (may be related):

May 30 20:23:53 kernel: [    0.000000] Linux version
3.13.0-27-lowlatency (address@hidden) (gcc version 4.8.2 (Ubuntu
4.8.2-19ubuntu1) ) #50-Ubuntu SMP PREEMPT Thu May 15 18:36:04 UTC 2014
(Ubuntu 3.13.0-27.50-lowlatency 3.13.11

May 31 14:15:40 kernel: [64348.760175] INFO: task qemu-system-x86:4151 blocked 
for more than 120 seconds.
May 31 14:15:40 kernel: [64348.767491]       Not tainted 3.13.0-27-lowlatency 
#50-Ubuntu
May 31 14:15:40 kernel: [64348.773291] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 31 14:15:40 kernel: [64348.781205] qemu-system-x86 D ffff881fffc34600     0 
 4151      1 0x00000000
May 31 14:15:40 kernel: [64348.781210]  ffff881fcf5e3de8 0000000000000002 
ffff881fbf140000 ffff881fcf5e3fd8
May 31 14:15:40 kernel: [64348.781215]  0000000000014600 0000000000014600 
ffff881fbf140000 ffff881fbf140000
May 31 14:15:40 kernel: [64348.781218]  ffff883fcfac7060 ffff883fcfac7068 
00007f3809e00000 ffff881fbf140000
May 31 14:15:40 kernel: [64348.781221] Call Trace:
May 31 14:15:40 kernel: [64348.781230]  [<ffffffff81722b89>] schedule+0x29/0x70
May 31 14:15:40 kernel: [64348.781237]  [<ffffffff8172552d>] 
rwsem_down_read_failed+0xcd/0x130
May 31 14:15:40 kernel: [64348.781243]  [<ffffffff81374b04>] 
call_rwsem_down_read_failed+0x14/0x30
May 31 14:15:40 kernel: [64348.781247]  [<ffffffff81725007>] ? 
down_read+0x17/0x20
May 31 14:15:40 kernel: [64348.781252]  [<ffffffff810a0db2>] 
task_numa_work+0xd2/0x300
May 31 14:15:40 kernel: [64348.781254]  [<ffffffff8109f87b>] ? 
account_user_time+0x8b/0xa0
May 31 14:15:40 kernel: [64348.781259]  [<ffffffff81089e87>] 
task_work_run+0xa7/0xe0
May 31 14:15:40 kernel: [64348.781264]  [<ffffffff81014e57>] 
do_notify_resume+0x97/0xb0
May 31 14:15:40 kernel: [64348.781268]  [<ffffffff8172e52a>] 
int_signal+0x12/0x17

I'm not seeing any kernel errors with the 3.12 kernel.

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https://bugs.launchpad.net/bugs/1308341

Title:
  Multiple CPUs causes blue screen on Windows guest (14.04 regression)

Status in QEMU:
  New
Status in “qemu” package in Ubuntu:
  Confirmed
Status in “virt-manager” package in Ubuntu:
  Confirmed

Bug description:
  Configuring a Windows 7 guest using more than one CPU cases the guest to 
fail. This happens after a few hours after guest boot. This is the error on the 
blue screen:
  "A clock interrupt was not received on a secondary processor within the 
allocated time interval"

  After resetting, the guest will never boot and a new bluescreen with
  the error "STOP: 0x0000005c" appears. Shutting down the guest
  completely and restarting it will allow it to boot and run for a few
  hours again.

  The guest was created using virt-manager. The error happens with or
  without virtio devices and with both 32-bit and 64-bit Windows 7
  guests.

  I am using Ubuntu 14.04 release candidate.

  qemu-kvm version 2.0.0~rc1+dfsg-0ubuntu3

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