Integration tests are crashing Ubuntu 18.04

[serban-nicusor-toptal]

Summary:

Integration tests are crashing the machine on Ubuntu 18.04

Description:

After a clean clone of the repository and the proper setup, when running the integration tests it gets to a point where it simply gets the machine stuck for good. ( can't stop the tests or do anything on it )

Reproducible Steps:

git clone https://github.com/stan-dev/stan.git
cd stan

make math-revert
make clean-all
git clean -xffd

echo "CXX=g++ -Werror" > make/local

./runTests.py -j16 src/test/integration

Current Output:

Right after this is printed to the console the machine gets stuck.

g++ -Werror  -std=c++1y -pthread -D_REENTRANT -Wno-sign-compare     -I lib/stan_math/lib/tbb_2019_U8/include -O0 -I src -I . -I lib/stan_math/ -I lib/stan_math/lib/eigen_3.3.3 -I lib/stan_math/lib/boost_1.69.0 -I lib/stan_math/lib/sundials_4.1.0/include -I lib/stan_math/lib/gtest_1.8.1/include -I lib/stan_math/lib/gtest_1.8.1 -I lib/stan_math/lib/gtest_1.8.1/include -I lib/stan_math/lib/gtest_1.8.1      -DBOOST_DISABLE_ASSERTS        -c -o /dev/null -include test/test-models/good/function-signatures/distributions/univariate/continuous/exp_mod_normal/exp_mod_normal_log_1.hpp test/test-model-main.cpp

For the complete log please see: Jenkins log

Expected Output:

Tests should either fail or complete but in no way they should terminate a machine.

Additional Information:

+ printenv
PARALLEL=16
SHELL=/bin/bash
N_TESTS=350
OPENCL_DEVICE_ID=1
PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Library/TeX/texbin:/usr/local/bin:/Library/TeX/texbin
LANG=C.UTF-8
CXX=/usr/local/opt/llvm@6/bin/clang++
SHLVL=3
HOME=/Users/jenkins
GCC=g++
JAVA_ARCH=x86_64
MPICXX=mpicxx

Current Version:

v2.21.0

[rok-cesnovar]

@serban-nicusor-toptal is this one still an issue? I am almost sure its not, but not completely.

[serban-nicusor-toptal]

I've just tested and it's working properly.