Re: [Qemu-devel] [Qemu-stable] 2.1 unexpected stop after exporting blockdev via nbd server

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Stefan Hajnoczi (2015-01-06 05:49:11)
> On Mon, Jan 05, 2015 at 05:12:10PM +0400, Andrey Korolyov wrote:
> > On Fri, Jan 2, 2015 at 4:04 PM, Stefan Hajnoczi <stefanha@gmail.com> wrote:
> > > On Thu, Dec 18, 2014 at 07:38:59PM +0400, Andrey Korolyov wrote:
> > >> 2.1-stable is currently crashing with the
> > >>
> > >> Co-routine re-entered recursively
> > >> 2014-12-16 15:06:23.578+0000: shutting down
> > >>
> > >> after execution of (for example) following when using virtio-dp as a
> > >> disk backend:
> > >>
> > >> '{ "execute": "nbd-server-start", "arguments": { "addr": { "type":
> > >> "inet", "data": { "host": "10.6.0.1", "port": "3333" } } } }'
> > >> '{ "execute": "nbd-server-add", "arguments": {"device":
> > >> "drive-virtio-disk0","writable": false } }'
> > >
> > > Hi,
> > > You need patches from Max Reitz that make the run-time NBD server
> > > support dataplane:
> > > f214928 nbd: Follow the BDS' AIO context
> > > 3338442 block: Add AIO context notifiers
> > > 958c717 nbd: Drop nbd_can_read()
> > >
> > > Please try QEMU v2.2.0 or qemu.git.
> > >
> > > Stefan
> > 
> > Thanks Stefan, those commits are enough to make dataplane drive work
> > well with runtime nbd server. By the way, can such functionality
> > improvements (not major improvements like discard support for scsi)
> > make their way as backports? To reword this, unexpected behavior like
> > sudden shutdown I described is better to be closed by later fixes than
> > by stubs or left as it currently behaving IMO.
> 
> Oops, I typoed the qemu-stable@nongnu.org email address.  Trying
> again...
> 
> QEMU stable folks: will there be another 2.1.x release?

Yes, 2.1.3 was very poorly timed to go out before Christmas but obviously
that didn't happen. The patch round-up should go out tomorrow with the
freeze next Wednesday. The updated schedule is available here:

http://qemu-project.org/Planning/2.1#Release_Schedule

> 
> Stefan