On (Fri) 29 Mar 2013 [08:29:01], Asias He wrote: > On Thu, Mar 28, 2013 at 04:58:33PM +0530, Amit Shah wrote: > > When multiple ovq operations are being performed (lots of open/close > > operations on virtio_console fds), the __send_control_msg() function can > > get confused without locking. > > > > A simple recipe to cause badness is: > > * create a QEMU VM with two virtio-serial ports > > * in the guest, do > > while true;do echo abc >/dev/vport0p1;done > > while true;do echo edf >/dev/vport0p2;done > > > > In one run, this caused a panic in __send_control_msg(). In another, I > > got > > > > virtio_console virtio0: control-o:id 0 is not a head! > > > > This also results repeated messages similar to these on the host: > > > > qemu-kvm: virtio-serial-bus: Unexpected port id 478762112 for device virtio-serial-bus.0 > > qemu-kvm: virtio-serial-bus: Unexpected port id 478762368 for device virtio-serial-bus.0 > > > > Reported-by: FuXiangChun <xfu@xxxxxxxxxx> > > Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx> > > So, probably this will not apply on virtio-next because of the > virtqueue_add_outbuf change. Yes, one-line context change. > Anyway, Reviewed-by: Asias He <asias@xxxxxxxxxx> Thanks! Amit _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
