Re: [Qemu-devel] [PATCH v9 0/6] monitor: enable OOB by default

[Eric Blake <eblake@redhat.com>]

On 10/10/18 2:26 PM, Eric Blake wrote:

> 
> On the other hand, when I'm trying to use a qemu binary with these 
> patches applied, libvirt is hanging when trying to probe the 
> capabilities of the binary, waiting for a response to 
> "qmp_capabilities". I'll try and bisect which patch is causing the 
> problem, and figure out why it is happening for libvirt and not running 
> by hand (perhaps is it a tty vs. Unix socket thing?)

Bisect didn't help much; it landed on:

     monitor: remove "x-oob", turn oob on by default

as the cause of libvirt hanging. I didn't have time to investigate 
further, other than the command line that is hanging:

/home/eblake/qemu/x86_64-softmmu/qemu-system-x86_64 -S -no-user-config 
-nodefaults -nographic -machine none,accel=kvm:tcg -qmp 
unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,nowait 
-pidfile /var/lib/libvirt/qemu/capabilities.pidfile -daemonize

And I suspect it is the -daemonize that is causing the hang I'm seeing 
when run by libvirt.

> Based-on: <20180828191048.29806-1-armbru@redhat.com>
> Based-on: <20180901111716.1675-1-armbru@redhat.com>
> 
> (this series is based on Markus's monitor-next tree)


Am I missing any prerequisite patches? Markus' monitor-next tree is 
currently a subset of git master (merge efd1d522).

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org