[Qemu-devel] [Bug 855800] Re: KVM crashes when attempting to restart migration

[Justin Fletcher]

I haven't attempted to reproduce the issue recently, I'm afraid. I've
changed jobs twice in the intervening time, so the immediate issue for
me has gone away. If I find an opportunity, I shall try to reproduce
with the most recent versions.

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https://bugs.launchpad.net/bugs/855800

Title:
  KVM crashes when attempting to restart migration

Status in QEMU:
  Incomplete
Status in qemu-kvm package in Ubuntu:
  Confirmed

Bug description:
  Operations performed:
  Sequence to trigger crash:

      * Start two kvm systems, one on gerph (primary), one on nbuild2 
(listening for incoming migration) - do not use -daemonize
      * On gerph, connect to monitor.
      * "migrate -d -b tcp:nbuild2:4444"
      * "info migrate"
      * "migrate_cancel"
      * "info migrate"
      * "migrate -d -b tcp:nbuild2:4444"
      * crashed with assertion:
  kvm: block-migration.c:355: flush_blks: Assertion `block_mig_state.read_done 
>= 0' failed.
                   Connection closed by foreign host.
  [1]+  Aborted                 (core dumped) kvm -drive 
file=./copy-disk2.img,boot=on -m 4096 -serial mon:telnet::23023,server,nowait 
-balloon virtio -vnc :99 -usbdevice tablet -net 
nic,macaddr=f6:a6:31:53:89:9a,model=rtl8139,vlan=0 -net tap,vlan=0

  
  Repeating the operations above often dies in different places; just repeat 
the cancel and restart the operation. Because the KVM system dies, the 
underlying VM is obviously terminated.

  Distribution:

  address@hidden:~$ lsb_release -rd
  Description:  Ubuntu 10.04.3 LTS
  Release:      10.04

  Package:

  address@hidden:~$ apt-cache policy kvm
  kvm:
    Installed: 1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.15
    Candidate: 1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.15
    Version table:
   *** 1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.15 0
          500 http://gb.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
          500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
          100 /var/lib/dpkg/status
       1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9 0
          500 http://gb.archive.ubuntu.com/ubuntu/ lucid/main Packages

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