Andreas Enge <andreas@enge.fr> writes:

> On Fri, Aug 05, 2016 at 08:42:46PM +0000, ng0 wrote:
>> This is weird. I ran this 2 days ago with no failing tests.
>> I'll see if I had an update I did not post.
>
> This could also be a sign of non-determinism. As posted two days ago,
> I had packages that failed on hydra, but built correctly locally.
> Sometimes there are also race conditions between different tests;
> adding "#:parallel-tests? #f" can be an option then.
>
> Andreas
>

With #:parallel-tests? #f

ng0@shadowwalker ~/src/guix/guix-libextractor$ ./pre-inst-env guix build --rounds=15 libextractor
/gnu/store/92wafrh7wfyzpdd89m38xsgq90qrybkn-libextractor-1.3


All 28 tests succeed.

Without it, the default:

@ build-succeeded
/gnu/store/c96r9pj4i1i95c5j35vl9nsrahj9xclg-libextractor-1.3.drv -
/gnu/store/4slpl020cwyxdygvn2ra07fk0pla2ajn-libextractor-1.3
retrieving 1 files from '192.168.1.198'...
Cannot open display "default display"
importing file or directory
'/gnu/store/4slpl020cwyxdygvn2ra07fk0pla2ajn-libextractor-1.3'...
found valid signature for
'/gnu/store/4slpl020cwyxdygvn2ra07fk0pla2ajn-libextractor-1.3'
Cannot open display "default display"
done with offloaded
'/gnu/store/c96r9pj4i1i95c5j35vl9nsrahj9xclg-libextractor-1.3.drv'
/gnu/store/4slpl020cwyxdygvn2ra07fk0pla2ajn-libextractor-1.3

This just to check eventual limitations of offloading since I am new to
using it:

ng0@shadowwalker ~/src/guix/guix-libextractor$ ./pre-inst-env guix build --no-build-hook --rounds=15 libextractor
make  all-recursive
make[1]: Entering directory '/home/ng0/src/guix/guix-libextractor'
Making all in po/guix
make[2]: Entering directory
'/home/ng0/src/guix/guix-libextractor/po/guix'
make[2]: Leaving directory
'/home/ng0/src/guix/guix-libextractor/po/guix'
Making all in po/packages
make[2]: Entering directory
'/home/ng0/src/guix/guix-libextractor/po/packages'
make[2]: Leaving directory
'/home/ng0/src/guix/guix-libextractor/po/packages'
make[2]: Entering directory '/home/ng0/src/guix/guix-libextractor'
Compiling Scheme modules...
make[2]: Leaving directory '/home/ng0/src/guix/guix-libextractor'
make[1]: Leaving directory '/home/ng0/src/guix/guix-libextractor'
/gnu/store/4slpl020cwyxdygvn2ra07fk0pla2ajn-libextractor-1.3


So I'd say use this patch I append and see what hydra does with it in
many runs. I can not reproduce your error here, but with parallel-tests
off, this can be addressed as a start. Later we should look at why it's
behaving like this and either patch here or upstream.