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

[Lucas Meneghel Rodrigues]

On 11/07/2011 07:29 AM, Kevin Wolf wrote:
> 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.

In the end of my original message, I stated the same test does not yield 
a segfault in qemu.git, so the referred commit indeed fixes the issue.

Thanks!