[lldb-dev] Test suite failures on Fedora Linux?

Pavel Labath via lldb-dev lldb-dev at lists.llvm.org
Wed Mar 27 08:38:29 PDT 2019

On 26/03/2019 14:48, David Zarzycki via lldb-dev wrote:
>> On Mar 26, 2019, at 3:07 AM, Jan Kratochvil
>> <jan.kratochvil at redhat.com> wrote:
>> On Mon, 25 Mar 2019 19:47:36 +0100, David Zarzycki via lldb-dev
>> wrote:
>>> Also, given that two of the test failures are Intel specific (the
>>> mxcsr register write failures), what class of hardware do you
>>> use? My workstation is Skylake-SP based, if it matters.
>> OK, I agree it PASSes for me on Haswell-EP (E5-2630v3) but it also
>> FAILs for me on Kaby Lake Refresh (i7-8650U).  Also
>> kernel-5.0.3-200.fc29.x86_64.
> It looks like this is a known issue:
> https://bugs.llvm.org/show_bug.cgi?id=39958

Ok, so I've managed to get a hold of a machine which reproduces this
problem. It's a debian based system running linux 4.19, which should
confirm that this is a hardware issue.

I'll try to find some time to diagnose this later this week. My guess is
that we're just setting some mxcsr value that these CPUs don't like, and
we need to be more conservative in what we write in the tests.

> Any ETA on renaming the variables? The bug you mentioned also had
 > someone offer to rename the variables in late 2017, but that seemingly
 > never happened.

I believe the rename that bug is referring to really did happen. What
you are seeing is a new test, which also uses "a" as a meaningless

I'll do the rename right away.


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