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Re: [Qemu-devel] qemu.git/qemu-kvm.git bugs during migrate + reboot

From: Lucas Meneghel Rodrigues
Subject: Re: [Qemu-devel] qemu.git/qemu-kvm.git bugs during migrate + reboot
Date: Tue, 25 Sep 2012 10:17:21 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 
On 09/25/2012 09:59 AM, Anthony Liguori wrote:

Lucas Meneghel Rodrigues <address@hidden> writes:


Hi guys,

We're seeing the following problem during upstream testing:

qemu: VQ 0 size 0x80 Guest index 0x2d6
      inconsistent with Host index 0x18: delta 0x2be
      qemu: warning:  error while loading state for
      instance 0x0 of device '0000:00:04.0/virtio-blk'
      load of migration failed

This is happening consistently with qemu and qemu-kvm. Test case is
simple, while the vm goes through a reboot loop, a parallel ping-pong
migration loop happens.

I'm happy to provide more details and logs.


Can you provide the full command line?
Sure. The problem happens with *all* migration protocols, let's use as an example the protocol fd. The vm is started with: 

09/22 07:26:19 INFO |    kvm_vm:1605| /usr/local/autotest/tests/kvm/qemu
09/22 07:26:19 INFO |    kvm_vm:1605|     -S
09/22 07:26:19 INFO |    kvm_vm:1605|     -name 'vm1'
09/22 07:26:19 INFO |    kvm_vm:1605|     -nodefaults
09/22 07:26:19 INFO | kvm_vm:1605| -chardev socket,id=hmp_id_humanmonitor1,path=/tmp/monitor-humanmonitor1-20120922-072139-HDnHgnLh,server,nowait 09/22 07:26:19 INFO | kvm_vm:1605| -mon chardev=hmp_id_humanmonitor1,mode=readline 09/22 07:26:19 INFO | kvm_vm:1605| -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20120922-072139-HDnHgnLh,server,nowait 09/22 07:26:19 INFO | kvm_vm:1605| -mon chardev=qmp_id_qmpmonitor1,mode=control 09/22 07:26:19 INFO | kvm_vm:1605| -chardev socket,id=serial_id_20120922-072139-HDnHgnLh,path=/tmp/serial-20120922-072139-HDnHgnLh,server,nowait 09/22 07:26:19 INFO | kvm_vm:1605| -device isa-serial,chardev=serial_id_20120922-072139-HDnHgnLh 09/22 07:26:19 INFO | kvm_vm:1605| -chardev socket,id=seabioslog_id_20120922-072139-HDnHgnLh,path=/tmp/seabios-20120922-072139-HDnHgnLh,server,nowait 09/22 07:26:19 INFO | kvm_vm:1605| -device isa-debugcon,chardev=seabioslog_id_20120922-072139-HDnHgnLh,iobase=0x402 
09/22 07:26:19 INFO |    kvm_vm:1605|     -device ich9-usb-uhci1,id=usb1
09/22 07:26:19 INFO | kvm_vm:1605| -drive file='/tmp/kvm_autotest_root/images/rhel62-64.qcow2',if=none,cache=none,id=virtio0 09/22 07:26:19 INFO | kvm_vm:1605| -device virtio-blk-pci,drive=virtio0 09/22 07:26:19 INFO | kvm_vm:1605| -device virtio-net-pci,netdev=idPQlGQt,mac='9a:4b:4c:4d:4e:4f',id='id01mORp' 
09/22 07:26:19 INFO |    kvm_vm:1605|     -netdev tap,id=idPQlGQt,fd=24
09/22 07:26:19 INFO |    kvm_vm:1605|     -m 2048
09/22 07:26:19 INFO | kvm_vm:1605| -smp 2,cores=1,threads=1,sockets=2 09/22 07:26:19 INFO | kvm_vm:1605| -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 
09/22 07:26:19 INFO |    kvm_vm:1605|     -vnc :0
09/22 07:26:19 INFO |    kvm_vm:1605|     -vga std
09/22 07:26:19 INFO | kvm_vm:1605| -rtc base=utc,clock=host,driftfix=none 
09/22 07:26:19 INFO |    kvm_vm:1605|     -boot order=cdn,once=c,menu=off
09/22 07:26:19 INFO |    kvm_vm:1605|     -enable-kvm
09/22 07:26:19 INFO |    kvm_vm:1605|     -enable-kvm

Then the state will be migrated to a new process:

09/22 07:26:48 INFO |    kvm_vm:1605| /usr/local/autotest/tests/kvm/qemu
09/22 07:26:48 INFO |    kvm_vm:1605|     -S
09/22 07:26:48 INFO |    kvm_vm:1605|     -name 'vm1'
09/22 07:26:48 INFO |    kvm_vm:1605|     -nodefaults
09/22 07:26:48 INFO | kvm_vm:1605| -chardev socket,id=hmp_id_humanmonitor1,path=/tmp/monitor-humanmonitor1-20120922-072648-g6gL8thp,server,nowait 09/22 07:26:48 INFO | kvm_vm:1605| -mon chardev=hmp_id_humanmonitor1,mode=readline 09/22 07:26:48 INFO | kvm_vm:1605| -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20120922-072648-g6gL8thp,server,nowait 09/22 07:26:48 INFO | kvm_vm:1605| -mon chardev=qmp_id_qmpmonitor1,mode=control 09/22 07:26:48 INFO | kvm_vm:1605| -chardev socket,id=serial_id_20120922-072648-g6gL8thp,path=/tmp/serial-20120922-072648-g6gL8thp,server,nowait 09/22 07:26:48 INFO | kvm_vm:1605| -device isa-serial,chardev=serial_id_20120922-072648-g6gL8thp 09/22 07:26:48 INFO | kvm_vm:1605| -chardev socket,id=seabioslog_id_20120922-072648-g6gL8thp,path=/tmp/seabios-20120922-072648-g6gL8thp,server,nowait 09/22 07:26:48 INFO | kvm_vm:1605| -device isa-debugcon,chardev=seabioslog_id_20120922-072648-g6gL8thp,iobase=0x402 
09/22 07:26:48 INFO |    kvm_vm:1605|     -device ich9-usb-uhci1,id=usb1
09/22 07:26:48 INFO | kvm_vm:1605| -drive file='/tmp/kvm_autotest_root/images/rhel62-64.qcow2',if=none,cache=none,id=virtio0 09/22 07:26:48 INFO | kvm_vm:1605| -device virtio-blk-pci,drive=virtio0 09/22 07:26:48 INFO | kvm_vm:1605| -device virtio-net-pci,netdev=idSld9kt,mac='9a:4b:4c:4d:4e:4f',id='idFBA7Vj' 
09/22 07:26:48 INFO |    kvm_vm:1605|     -netdev tap,id=idSld9kt,fd=45
09/22 07:26:48 INFO |    kvm_vm:1605|     -m 2048
09/22 07:26:48 INFO | kvm_vm:1605| -smp 2,cores=1,threads=1,sockets=2 09/22 07:26:48 INFO | kvm_vm:1605| -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 
09/22 07:26:48 INFO |    kvm_vm:1605|     -vnc :1
09/22 07:26:48 INFO |    kvm_vm:1605|     -vga std
09/22 07:26:48 INFO | kvm_vm:1605| -rtc base=utc,clock=host,driftfix=none 
09/22 07:26:48 INFO |    kvm_vm:1605|     -boot order=cdn,once=c,menu=off
09/22 07:26:48 INFO |    kvm_vm:1605|     -enable-kvm
09/22 07:26:48 INFO |    kvm_vm:1605|     -enable-kvm
09/22 07:26:48 INFO |    kvm_vm:1605|     -incoming "fd:43"

Then the state starts to be transferred:

09/22 07:26:50 INFO |    kvm_vm:2348| Migrating to fd:migfd_44_1348313208
09/22 07:26:50 DEBUG|kvm_monito:0177| (monitor humanmonitor1) Sending command 'migrate -d fd:migfd_44_1348313208' 09/22 07:26:52 DEBUG|virt_utils:1537| Waiting for migration to complete (2.001432 secs) 09/22 07:26:52 DEBUG|kvm_monito:0177| (monitor humanmonitor1) Sending command 'info migrate' 09/22 07:26:52 DEBUG|kvm_monito:0316| (monitor humanmonitor1) Response to 'info migrate' 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) capabilities: xbzrle: off 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) Migration status: active 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total time: 2060 milliseconds 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) transferred ram: 62363 kbytes 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) remaining ram: 1873896 kbytes 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total ram: 2113920 kbytes 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) duplicate: 44426 pages 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal: 15580 pages 09/22 07:26:52 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal bytes: 62320 kbytes 09/22 07:26:54 DEBUG|virt_utils:1537| Waiting for migration to complete (4.053059 secs) 09/22 07:26:54 DEBUG|kvm_monito:0177| (monitor humanmonitor1) Sending command 'info migrate' 09/22 07:26:54 DEBUG|kvm_monito:0316| (monitor humanmonitor1) Response to 'info migrate' 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) capabilities: xbzrle: off 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) Migration status: active 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total time: 4066 milliseconds 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) transferred ram: 75414 kbytes 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) remaining ram: 817052 kbytes 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total ram: 2113920 kbytes 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) duplicate: 305439 pages 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal: 18779 pages 09/22 07:26:54 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal bytes: 75116 kbytes 09/22 07:26:56 DEBUG|virt_utils:1537| Waiting for migration to complete (6.058427 secs) 09/22 07:26:56 DEBUG|kvm_monito:0177| (monitor humanmonitor1) Sending command 'info migrate' 09/22 07:26:56 DEBUG|kvm_monito:0316| (monitor humanmonitor1) Response to 'info migrate' 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) capabilities: xbzrle: off 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) Migration status: active 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total time: 6071 milliseconds 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) transferred ram: 104012 kbytes 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) remaining ram: 272960 kbytes 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total ram: 2113920 kbytes 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) duplicate: 434349 pages 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal: 25897 pages 09/22 07:26:56 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal bytes: 103588 kbytes 09/22 07:26:58 DEBUG|virt_utils:1537| Waiting for migration to complete (8.063601 secs) 09/22 07:26:58 DEBUG|kvm_monito:0177| (monitor humanmonitor1) Sending command 'info migrate' 09/22 07:26:58 DEBUG|kvm_monito:0316| (monitor humanmonitor1) Response to 'info migrate' 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) capabilities: xbzrle: off 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) Migration status: active 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total time: 8076 milliseconds 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) transferred ram: 178196 kbytes 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) remaining ram: 198380 kbytes 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total ram: 2113920 kbytes 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) duplicate: 434450 pages 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal: 44443 pages 09/22 07:26:58 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal bytes: 177772 kbytes 09/22 07:27:00 DEBUG|virt_utils:1537| Waiting for migration to complete (10.068405 secs) 09/22 07:27:00 DEBUG|kvm_monito:0177| (monitor humanmonitor1) Sending command 'info migrate' 09/22 07:27:00 DEBUG|kvm_monito:0316| (monitor humanmonitor1) Response to 'info migrate' 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) capabilities: xbzrle: off 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) Migration status: active 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total time: 10083 milliseconds 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) transferred ram: 263581 kbytes 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) remaining ram: 109596 kbytes 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total ram: 2113920 kbytes 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) duplicate: 435357 pages 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal: 65789 pages 09/22 07:27:00 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal bytes: 263156 kbytes 09/22 07:27:02 DEBUG|virt_utils:1537| Waiting for migration to complete (12.074452 secs) 09/22 07:27:02 DEBUG|kvm_monito:0177| (monitor humanmonitor1) Sending command 'info migrate' 09/22 07:27:02 DEBUG|kvm_monito:0316| (monitor humanmonitor1) Response to 'info migrate' 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) capabilities: xbzrle: off 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) Migration status: active 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total time: 12088 milliseconds 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) transferred ram: 348521 kbytes 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) remaining ram: 62564 kbytes 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) total ram: 2113920 kbytes 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) duplicate: 439474 pages 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal: 87023 pages 09/22 07:27:02 DEBUG|kvm_monito:0318| (monitor humanmonitor1) normal bytes: 348092 kbytes 09/22 07:27:02 INFO | aexpect:0786| [qemu output] qemu: VQ 0 size 0x80 Guest index 0x2d3 inconsistent with Host index 0x8: delta 0x2cb 09/22 07:27:02 INFO | aexpect:0786| [qemu output] qemu: warning: error while loading state for instance 0x0 of device '0000:00:04.0/virtio-blk' 
09/22 07:27:02 INFO |   aexpect:0786| [qemu output] load of migration failed
09/22 07:27:02 INFO | aexpect:0786| [qemu output] (Process terminated with status 0)
So at some point qemu throws this message and exits cleanly. I did notice we're adding -enable-kvm twice, will fix it, though I doubt it's the source of the problem. 

Regards,

Lucas
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