Re: [Qemu-devel] qemu-kvm crashes doing migration with disks + blkdebug files (does not happen with qemu)

[Kevin Wolf]

Am 05.11.2011 03:16, schrieb Lucas Meneghel Rodrigues:
> Hi folks,
> 
> qemu-kvm is segfaulting when executing migration with blkdebug files.
> 
> 19:50:02 DEBUG| Git repo qemu_kvm uri: git://github.com/avikivity/qemu.git
> 19:50:02 DEBUG| Git repo qemu_kvm branch: master
> 19:50:30 INFO | Commit hash for qemu_kvm is 
> 7879db7e9c09b92d9af1c143fbe2cc212ec89e4b (no tag found)
> 
> How to reproduce:
> 
> 1) create a origin vm like:
> 
> /usr/local/autotest/tests/kvm/qemu -name 'vm1' -nodefaults -vga std 
> -monitor 
> unix:'/tmp/monitor-humanmonitor1-20111104-200902-95j0',server,nowait 
> -qmp unix:'/tmp/monitor-qmpmonitor1-20111104-200902-95j0',server,nowait 
> -serial unix:'/tmp/serial-20111104-200902-95j0',server,nowait -drive 
> file=blkdebug:/usr/local/autotest/virt/blkdebug/default.conf:/tmp/kvm_autotest_root/images/rhel6.1-64.qcow2,index=0,if=virtio,cache=none,rerror=stop,werror=stop
>  
> -device 
> virtio-net-pci,netdev=idtzhBVb,mac='9a:d0:7b:07:18:72',id='id9JW3ZV' 
> -netdev tap,id=idtzhBVb,fd=23 -m 2048 -smp 2 -vnc :0
> 
> 
> 2) create a destination vm like:
> 
> /usr/local/autotest/tests/kvm/qemu -name 'vm1' -nodefaults -vga std 
> -monitor 
> unix:'/tmp/monitor-humanmonitor1-20111104-201329-Ia9o',server,nowait 
> -qmp unix:'/tmp/monitor-qmpmonitor1-20111104-201329-Ia9o',server,nowait 
> -serial unix:'/tmp/serial-20111104-201329-Ia9o',server,nowait -drive 
> file=blkdebug:/usr/local/autotest/virt/blkdebug/default.conf:/tmp/kvm_autotest_root/images/rhel6.1-64.qcow2,index=0,if=virtio,cache=none,rerror=stop,werror=stop
>  
> -device 
> virtio-net-pci,netdev=idup1xAf,mac='9a:d0:7b:07:18:72',id='idyvOQf3' 
> -netdev tap,id=idup1xAf,fd=19 -m 2048 -smp 2 -vnc :1  -S -incoming 
> "exec:nc -l 5200"
> 
> Note that blkdebug file contains:
> 
> [inject-error]
> state = "2"
> event = "read_aio"
> errno = "7"
> immediately = "off"
> once = "on"
> 
> [set-state]
> state = "1"
> event = "read_aio"
> new_state = "2"
> 
> [set-state]
> state = "2"
> event = "read_aio"
> new_state = "3"
> 
> Start the migration (on this example, using exec, but it reproduces with 
> tcp and unix sockets):
> 
> 11/04 20:13:30 DEBUG|kvm_monito:0254| (monitor humanmonitor1) Sending 
> command 'migrate -d "exec:nc localhost 5200"'
> 
> Then you will have:
> 
> 11/04 20:13:33 INFO |   aexpect:0783| [qemu output] invalid runstate 
> transition

Invalid runstate transition is something for Luiz (CCed). Though
probably he doesn't need to do anything in this case: I think we're not
allowing the transition from I/O error to migrating. This might be fixed
by 8a9236f1 in qemu.git, so please retest with upstream.

Kevin