[Xen-devel] Proposed force push of staging to master

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

xen.org writes ("[xen-unstable test] 24870: regressions - trouble: 
broken/fail/pass"):
> flight 24870 xen-unstable real [real]
> http://www.chiark.greenend.org.uk/~xensrcts/logs/24870/
> 
> Regressions :-(
> 
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  build-i386-oldkern            3 host-build-prep       fail REGR. vs. 24862

This was the "usual" failure: Citrix's intercepting web proxy causes
some hg clones of linux-2.6.18.hg from xenbits to fail.  The rest of
the flight was successful.

The rest of the weekend's tests were badly affected by a disk failure
on earwig.  So as a result we didn't get a push.

I cleared out a bunch of other stuff running in the test system in an
effort to get a pass sooner, but peeking at the results the same job
has failed the same way in the currently-running flight.  So we won't
get a push in that iteration either.

We should consider doing a force push for RC4.  The risks are:
 * There is something actually wrong with xen.git which causes the
   32-bit 2.6.18 build to fail;
 * Less resistance in the future to 2.6.18 build failures.
I'll discuss these in turn.

The build-*-oldkern tests involve using the kernel-building machinery
in xen.git to clone 2.6.18 from xenbits and build it.  Firstly, I think
it's unlikely that anything in xen.git#d883c179..4e8d89bc would affect
that.  Secondly, the build-amd64-oldkern builds have passed.  So I
think we can almost entirely discount the first risk.

I think the second risk is tolerable.  We should keep an eye on it for
a bit and if it turns out that the oldkern build really does become
broken later and as a result keeps failing indefinitely, we will be
able to spot that.

So, we propose to push 4e8d89bc1445f91c4c6c7bf0ad8d51b0c809841e to
xen.git#master and call it RC4.  Comments welcome.

Ian.

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