tests/pkg/relic is failing on samr21-xpro when built using llvm

[aabadie]

Description

For some reason the application is crashing on a samr21-xpro and as a result the test is failing. See this Murdock job.

Steps to reproduce the issue

1. Start an experiment on iotlab ("pip install iotlabcli" if you don't have the iotlab cli tools installed):

iotlab-experiment submit -d 120 -l 1,archi=samr21:at86rf233+site=saclay

2. Build/flash/test on the iotlab board:

RIOT_CI_BUILD=1 IOTLAB_NODE=auto TOOLCHAIN=llvm BOARD=samr21-xpro make -C tests/pkg/relic clean flash test

If you have a samr21-xpro board locally, you can skip step 1 and remove IOTLAB_NODE=auto from step 2.

Expected results

the test is working

Actual results

the test fails because the application seems to be crashed.

Versions

Current master at d1edbd9