Re: [Qemu-devel] [Nbd] Hibernate and qemu-nbd

[Mark Trumpold]

>-----Original Message-----
>From: Wouter Verhelst [mailto:address@hidden
>Sent: Thursday, September 26, 2013 12:46 PM
>To: 'Mark Trumpold'
>Cc: address@hidden, 'Stefan Hajnoczi', 
>address@hidden, 'Paul Clements', address@hidden
>Subject: Re: [Nbd] [Qemu-devel] Hibernate and qemu-nbd
>
>On 25-09-13 16:42, Mark Trumpold wrote:
>> Hello Wouter,
>> 
>> Thank you for your input.
>> 
>> I replayed the test as follows:
>> 
>>   -> qemu-nbd -p 2000 -persist /root/qemu/q1.img &
>>   -> nbd-client localhost 2000 /dev/nbd0
>
>No.
>
>nbd-client -persist localhost 2000 /dev/nbd0
>
>-- 
>This end should point toward the ground if you want to go to space.
>
>If it starts pointing toward space you are having a bad problem and you
>will not go to space today.
>
>  -- http://xkcd.com/1133/
>

Sorry guys, I did the email by memory (bad idea).

Actually, what I did:
  849  qemu-nbd -p 2000 /root/qemu/q1.img &
  850  nbd-client -persist localhost 2000 /dev/nbd0
  851  ps aux | grep nbd
  852  echo reboot >/sys/power/disk
  853  echo disk >/sys/power/state

At the prompt after the hibernate (test mode: 'reboot')
I see the following:

/build/buildd-qemu_0.12.5+dfsg-3squeeze3-amd64-9wXBnc/qemu-0.12.5+dfsg/nbd.c:nbd_receive_request():L465:
 read failed
[1]+  Done                    qemu-nbd -p 2000 /root/qemu/q1.img

================
Looks like 'qemu-nbd' exited on some signal.  No other indicators.
I see no other relevant messages in syslog.
In dmesg I see the message (as expected):

Sep 26 13:27:13 debian-test kernel: [606754.367766] Freezing user space 
processes ...
Sep 26 13:27:13 debian-test kernel: [606754.367840] nbd (pid 8432: nbd-client) 
got signal 0
Sep 26 13:27:13 debian-test kernel: [606754.367844] block nbd0: shutting down 
socket
Sep 26 13:27:13 debian-test kernel: [606754.367872] block nbd0: Receive control 
failed (result -4)
Sep 26 13:27:13 debian-test kernel: [606754.367890] block nbd0: queue cleared

================

Thank you,
Mark T.