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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 10 Feb 2016, Ian Campbell wrote:
> Adding some CCs.Â
>
> 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:
> > > Âbuild-i386ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ5 xen-buildÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂfail REGR. vs. 
> > > 79947
> > > Âbuild-amd64ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ5 xen-buildÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂfail REGR. vs. 
> > > 79947
> > > Âbuild-i386-xsmÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ5 xen-buildÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂfail REGR. vs. 
> > > 79947
> > > Âbuild-amd64-xsmÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ5 xen-buildÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂfail REGR. vs. 
> > > 79947
> > > Âbuild-armhfÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ5 xen-buildÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂfail REGR. vs. 
> > > 79947
> > > Âbuild-armhf-xsmÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ5 xen-buildÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂfail REGR. vs. 
> > > 79947
> >
> > ./configure of QEMU fail with:
> > "ERROR: invalid trace backends
> > ÂÂÂÂÂÂÂÂPlease 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:
>
> Â commit ed7f5f1d8db06fc31352a5ef4f54985e630c575a
> Â Author: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Â Date:ÂÂÂThu Jan 7 16:55:30 2016 +0300
> Â
> ÂÂÂÂÂÂtrace: convert stderr backend to log
> ÂÂÂÂÂÂ
> ÂÂÂÂÂÂ[Also update .travis.yml --enable-trace-backends=stderr
> ÂÂÂÂÂÂ--Stefan]
> ÂÂÂÂÂÂ
> ÂÂÂÂÂÂSigned-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ÂÂÂÂÂÂSigned-off-by: Denis V. Lunev <den@xxxxxxxxxx>
> ÂÂÂÂÂÂAcked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ÂÂÂÂÂÂMessage-id: 1452174932-28657-10-git-send-email-den@xxxxxxxxxx
> ÂÂÂÂÂÂSigned-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
>
> 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
>     [...]
>     Âscripts/tracetool/backend/{stderr.py => log.py} |ÂÂ9 +++++----
>
> Maybe xen.git/tools/Makefile could probe for the presence of these files?

We can have QEMU list the trace backends available with:

./scripts/tracetool.py --list-backends

that works on all qemu-xen versions >= 4.3.

Same output:
nop, ust, stderr, dtrace, simple

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