tags 639867 + moreinfo unreproducible
thanks

On 31.08.2011 11:11, folkert wrote:
> Hi,
> 
> KVM/Qemu gets unstable when a blockdevice is removed when the vm is not 
> running.
> E.g.:
> 
> - connect nbd device to nbd-server
> - start windows xp in vm
> - stop windows xp
> - disconnect nbd device
> - reconnect nbd-device
> - restart vm
> 
> now you'll see hangups and for example vnc-sessions displaying the virtual 
> display but totally ignoring e.g. keypresses

I'm not sure this makes any sense at all.  You reconnect a device
while some application is not running, you start that application
and it starts behaving badly.  If that's really the case, the bug
is in the device not the application.

Note that nbd in linux is single-threaded, ie, it can't handle
multiple concurrent requests, and linux nbd client can't submit
multiple requests too, so it may be quite slow - like "old good"
IDE without command queuing support.

/mjt



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