Re: [Qemu-devel] [PATCH v4 2/4] char: convert from GIOChannel to QIOChannel

[Daniel P. Berrange]

On Fri, Mar 18, 2016 at 05:43:42PM +0100, Laurent Vivier wrote:
> Hi,
> 
> testing something else (migration...) I've discovered (by bisecting)
> that this patch can allow to lock the machine. I'm using the pseries
> machine, but I think it should happen with PC too.
> 
> I start a machine with:
> 
>       ...
>       -device virtio-serial-pci,id=serial0 \
>       -chardev socket,id=channel0,path=/tmp/serial_socket,server,nowait \
>       -device virtserialport,bus=serial0.0,nr=1,chardev=channel0
> 
> and I open the unix socket /tmp/serial_socket without reading it:
> 
> $ python
> import socket
> sock = socket.socket(socket.AF_UNIX)
> sock.connect("/tmp/serial_socket_1")
> 
> Then in the guest:
> 
> cat /dev/zero > /dev/vport1p1
> 
> -> at this point, the machine hangs until we read data in unix socket
> (we can't interact with monitor, we can't ping the machine...)

Pretty sure that'll be the same issue Andrew reported here

https://lists.gnu.org/archive/html/qemu-devel/2016-03/msg02843.html

can you see if his suggested addition works for you too

Regards,
Daniel
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