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Re: [libvirt] error: server response too large



On Mon, Sep 30, 2013 at 05:23:33PM +0200, Michal Privoznik wrote:
> On 30.09.2013 17:02, Claudio Bley wrote:
> > Hi.
> > 
> > When trying to do a screenshot of a remote domain connected via
> > qemu+tcp (for testing purposes only), I receive this error:
> > 
> > ----------------------------------------------------------------------
> > virsh -c qemu+tcp://dev/system
> > Welcome to virsh, the virtualization interactive terminal.
> > 
> > Type:  'help' for help with commands
> >        'quit' to quit
> > 
> > virsh # version
> > Compiled against library: libvir 0.9.8
> > Using library: libvir 0.9.8
> > Using API: QEMU 0.9.8
> > Running hypervisor: QEMU 1.5.1
> > 
> > virsh # screenshot 2 /tmp/screendump
> > error: could not receive data from domain 2
> > error: packet 1048600 bytes received from server too large, want 262144
> > 
> > virsh # 2013-09-30 14:47:05.158+0000: 21646: info : libvirt version: 0.9.8
> > 2013-09-30 14:47:05.158+0000: 21646: warning : virNetClientIncomingEvent:1660 : Something went wrong during async message processing
> > ----------------------------------------------------------------------
> > 
> > I'm using Ubuntu LTS 12.04.3, latest version in the repo which is
> > 0.9.8-2ubuntu17.13.
> 
> This works as expected. 0.9.8 still had a small buffer for RPC messages.
> It's since 0.9.13 release that we've switched to dynamically allocated
> buffer and hence could size up the limit for incoming data. Update the
> client and problem will just go away.

Actually that is not working as expected. The old client should *always*
be able to talk to a new server. If the new server is unconditionally
sending back data that is too large for the client, this is a bug.

Daniel
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