Re: [qemu-mainline test] 80469: regressions - FAIL

[Ian Campbell <ian.campbell@citrix.com>]

Adding some CCs. 

On Fri, 2016-02-05 at 11:52 +0000, Anthony PERARD wrote:
> On Fri, Feb 05, 2016 at 06:30:25AM +0000, osstest service owner wrote:
> > flight 80469 qemu-mainline real [real]
> > http://logs.test-lab.xenproject.org/osstest/logs/80469/
> > 
> > Regressions :-(
> > 
> > Tests which did not succeed and are blocking,
> > including tests which could not be run:
> >  build-i386                    5 xen-build                 fail REGR. vs. 79947
> >  build-amd64                   5 xen-build                 fail REGR. vs. 79947
> >  build-i386-xsm                5 xen-build                 fail REGR. vs. 79947
> >  build-amd64-xsm               5 xen-build                 fail REGR. vs. 79947
> >  build-armhf                   5 xen-build                 fail REGR. vs. 79947
> >  build-armhf-xsm               5 xen-build                 fail REGR. vs. 79947
> 
> ./configure of QEMU fail with:
> "ERROR: invalid trace backends
>         Please choose supported trace backends."
> 
> They have remove the "stderr" tracebackend, and replaced it by "log". Which
> also became the default. I have not look at what to do yet, but the configure
> option "--enable-trace-backend=stderr" as became invalid.

Paul added this IIRC.

If it isn't immediately obvious what an appropriate replacement is (which
remember needs to work with at least qemu-xen-unstable as well as qemu-
upstream) then I think we should just remove this option from
xen.git/tools/Makefile for the time being.

FWIW the bisector has fingered:

  commit ed7f5f1d8db06fc31352a5ef4f54985e630c575a
  Author: Paolo Bonzini <pbonzini@redhat.com>
  Date:   Thu Jan 7 16:55:30 2016 +0300
  
      trace: convert stderr backend to log
      
      [Also update .travis.yml --enable-trace-backends=stderr
      --Stefan]
      
      Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
      Signed-off-by: Denis V. Lunev <den@openvz.org>
      Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
      Message-id: 1452174932-28657-10-git-send-email-den@openvz.org
      Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

It looks like s/stderr/log/g would work with qemu-mainline, but we'd need
that backported to qemu-xen-unstable too.

Or given:
    git show --stat -M ed7f5f1d8db06fc31352a5ef4f54985e630c575a
    [...]
     scripts/tracetool/backend/{stderr.py => log.py} |  9 +++++----

Maybe xen.git/tools/Makefile could probe for the presence of these files?

Ian.
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