Re: [Qemu-stable] [Qemu-devel] qmp commands get rejected

[Stefan Priebe]

Hi,

i can easily reproduce this with the following script:
http://pastebin.com/raw.php?i=JYZyJ8Hn

Example output (sometimes it fails for qmp_capabilities and sometimes 
for qom-set):
[cloud1-1202: ~]# perl sock.pl
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
[cloud1-1202: ~]# perl sock.pl
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}
{"id": "12125:1", "error": {"class": "CommandNotFound", "desc": "The 
command qmp_capabilities has not been found"}}

Stefan

Am 24.05.2013 17:21, schrieb Luiz Capitulino:
> On Fri, 24 May 2013 16:36:26 +0200
> Stefan Priebe - Profihost AG <address@hidden> wrote:
>
> > Am 24.05.2013 um 16:02 schrieb Luiz Capitulino <address@hidden>:
> >
> > > On Fri, 24 May 2013 15:57:59 +0200
> > > Stefan Priebe - Profihost AG <address@hidden> wrote:
> > >
> > > > Am 24.05.2013 um 15:23 schrieb Luiz Capitulino <address@hidden>:
> > > >
> > > > > On Fri, 24 May 2013 07:50:33 +0200
> > > > > Stefan Priebe <address@hidden> wrote:
> > > > >
> > > > > > Hello list,
> > > > > >
> > > > > > since upgrading from qemu 1.4.1 to 1.5.0 i've problems with qmp commands.
> > > > > >
> > > > > > With Qemu 1.5 i've the following socket communication:
> > > > > >
> > > > > > '{"execute":"qmp_capabilities","id":"12125:1","arguments":{}}'
> > > > > >
> > > > > > '{"return": {}, "id": "12125:1"}'
> > > > > >
> > > > > > '{"execute":"qom-set","id":"12125:2","arguments":{"value":2,"path":"machine/peripheral/balloon0","property":"guest-stats-polling-interval"}}'
> > > > > >
> > > > > > '{"QMP": {"version": {"qemu": {"micro": 0, "minor": 5, "major": 1},
> > > > > > "package": ""}, "capabilities": []}}'
> > > > > >
> > > > > > '{"id": "12125:2", "error": {"class": "CommandNotFound", "desc": "The
> > > > > > command qom-set has not been found"}}'
> > > > > >
> > > > > >
> > > > > > It seems that the command mode (qmp_capabilities) gets resets by the
> > > > > > welcome banner?
> > > > >
> > > > > It looks like you got disconnected before qom-set was issued.
> > > >
> > > > No its the same socket connection. No disconnect had happened.
> > > >
> > > > > Can you share more details on how those commands are being issued?
> > > >
> > > > They're send through socket with a perl script. What do you need?
> > >
> > > That perl script maybe? I can't reproduce the problem.
> >
> > I would try to create a small example script.
>
> I use qmp-shell and other little scripts very often.
>
> > Am this be due to the fact that I don't wait for the welcome banner right now?
>
> If you're not reading from the socket, then you'll get the banner back when
> you read your first response. But qom-set shouldn't fail because of that.