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Re: [Xen-devel] [xen-4.8-testing test] 109585: regressions - FAIL

On 19/05/17 14:20, osstest service owner wrote:
> flight 109585 xen-4.8-testing real [real]
> http://logs.test-lab.xenproject.org/osstest/logs/109585/
> Regressions :-(
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-xtf-amd64-amd64-3 45 xtf/test-hvm64-lbr-tsx-vmentry fail REGR. vs. 
> 109515
>  test-xtf-amd64-amd64-1 45 xtf/test-hvm64-lbr-tsx-vmentry fail REGR. vs. 
> 109515

These are not actual regressions.

test-hvm64-lbr-tsx-vmentry is generic test which runs on all hardware,
but it triggers a host-specific failure mode on Intel Haswell processors
and later.

Xen 4.9 has a number of functional fixes which amount to a workaround,
*iff* up-to-date microcode is also suitably loaded at boot.  (It appears
that Debian Jessie DTRT here, so this specific angle is probably fine.)

On Xen 4.8, this test will reliably fail on all Intel Haswell/Broadwell
hardware, and reliably pass on all other hardware.

The reason it is flagged as a regression is because OSSTest is tracking
regressions by xtf-*-{1...5} results, but scheduling these jobs on any
hardware.  What has happened is that these jobs previously ran on AMD or
older Intel hardware, and have now been run on Haswell/Broadwell.


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