Getting spurious FAILS in testsuite?

[Georg-Johann Lay]

On 05.06.2017 18:25, Jim Wilson wrote:
> On 06/01/2017 05:59 AM, Georg-Johann Lay wrote:
>> Hi, when I am running the gcc testsuite in $builddir/gcc then
>> $ make check-gcc RUNTESTFLAGS='ubsan.exp'
>> comes up with spurious fails.
>
> This was discussed before, and the suspicion was that it was a linux
> kernel bug.  There were multiple kernel fixes pointed at, it wasn't
> clear which one was required to fix it.
>
> I have Ubuntu 16.04 LTS on my laptop, and I see the problem.  I can't
> run the ubsan testsuites with -j factor greater than one and get
> reproducible results.  There may also be other ways to trigger the problem.
>
> See for instance the thread
>     https://gcc.gnu.org/ml/gcc/2016-07/msg00117.html
> The first message in the thread from Andrew Pinski mentions that the log
> output is corrupted from apparent buffer overflow.
>
> Jim


I have "Ubuntu 16.04.2 LTS".

Asking this at DejaGNU's, I got the following pointer:

https://lists.gnu.org/archive/html/dejagnu/2016-03/msg00034.html

AFAIU there is a problem separating stdout and stderr?

Johann