Re: [Qemu-devel] [PULL 2.7 0/1] virtio-console: fix receiving data from guest

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, Aug 11, 2016 at 03:37:27PM +0100, Peter Maydell wrote:
> On 11 August 2016 at 12:23, Amit Shah <amit.shah@redhat.com> wrote:
> > The following changes since commit d08306dc42ea599ffcf8aad056fa9c23acfbe230:
> >
> >   Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging (2016-08-10 17:14:35 +0100)
> >
> > are available in the git repository at:
> >
> >   http://git.kernel.org/pub/scm/virt/qemu/amit/virtio-serial.git tags/vser-for-2.7-1
> >
> > for you to fetch changes up to bce6261eb2d879625126485d4ddd28cacb93152e:
> >
> >   virtio-console: set frontend open permanently for console devs (2016-08-11 16:38:58 +0530)
> >
> > ----------------------------------------------------------------
> > virtio-console: fix receiving data from guest
> >
> > ----------------------------------------------------------------
> >
> >
> > Daniel P. Berrange (1):
> >   virtio-console: set frontend open permanently for console devs
> >
> >  hw/char/virtio-console.c | 25 +++++++++++++++++++++----
> >  1 file changed, 21 insertions(+), 4 deletions(-)
> 
> This hung in make check (clang-on-x86-64-linux build):
> 
> Offending process:
> 
> i386-softmmu/qemu-system-i386 -qtest unix:/tmp/qtest-5861.sock,nowait
> -qtest-log /dev/null -qmp unix:/tmp/qtest-5861.qmp,nowait -machine
> accel=qtest -display none -machine accel=tcg -m 512 -object
> memory-backend-file,id=mem,size=512M,mem-path=/tmp/vhost-test-wWBX5W,share=on
> -numa node,memdev=mem -chardev
> socket,id=chr-test,path=/tmp/vhost-test-wWBX5W/test.sock -netdev
> vhost-user,id=net0,chardev=chr-test,vhostforce -device
> virtio-net-pci,netdev=net0,romfile=./pc-bios/pxe-virtio.rom
> 
> Backtraces below, but the fact that thread 3 is busy-looping in
> qemu_chr_fe_read_all() looks suspicious.

Strange, because that command line doesn't even add a virtio-console
or virtio-serial device and AFAICT it doesn't hotplug any such device
either. So I'm unclear how this patch could affect that test at all. 


Regards,
Daniel
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