[Bug 855800] [NEW] KVM crashes when attempting to restart migration

[Justin Fletcher]

Public bug reported:

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:

jfletcher at gerph:~$ lsb_release -rd
Description:	Ubuntu 10.04.3 LTS
Release:	10.04

Package:

jfletcher at gerph:~$ 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

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New

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

Title:
  KVM crashes when attempting to restart migration

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