[Cython] Failing test reimport_from_subinterpreter

[Jeroen Demeyer]

Hello,

I'm getting various reports of the test reimport_from_subinterpreter 
failing (within Sage, Cython 0.29, Python 2.7.15).

Annoyingly, the problem can only be reproduced when running the full 
Cython testsuite, not when running the test in isolation. I'll continue 
to investigate, but I'm already posting it here in case somebody has an 
idea. The error is not very enlightening (is there a way to get the 
exception from the subinterpreter?):

End-to-end reimport_from_subinterpreter ... 
/home/jdemeyer/sage-test/local/bin/python2 setup.py build_ext --inplace
Compiling package/subtest.pyx because it changed.
Compiling subtest.pyx because it changed.
[1/2] Cythonizing package/subtest.pyx
[2/2] Cythonizing subtest.pyx
running build_ext
building 'package.subtest' extension
creating build
creating build/temp.linux-ppc64le-2.7
creating build/temp.linux-ppc64le-2.7/package
gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
-Wno-unused -fPIC -I/home/jdemeyer/sage-test/local/include/python2.7 -c 
package/subtest.c -o build/temp.linux-ppc64le-2.7/package/subtest.o
gcc -pthread -shared -L/home/jdemeyer/sage-test/local/lib 
-Wl,-rpath,/home/jdemeyer/sage-test/local/lib 
-L/home/jdemeyer/sage-test/local/lib 
-Wl,-rpath,/home/jdemeyer/sage-test/local/lib 
build/temp.linux-ppc64le-2.7/package/subtest.o 
-L/home/jdemeyer/sage-test/local/lib -lpython2.7 -o 
/home/jdemeyer/sage-test/local/var/tmp/sage/build/cython-0.29/src/TEST_TMP/run/reimport_from_subinterpreter/package/subtest.so
building 'subtest' extension
gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
-Wno-unused -fPIC -I/home/jdemeyer/sage-test/local/include/python2.7 -c 
subtest.c -o build/temp.linux-ppc64le-2.7/subtest.o
gcc -pthread -shared -L/home/jdemeyer/sage-test/local/lib 
-Wl,-rpath,/home/jdemeyer/sage-test/local/lib 
-L/home/jdemeyer/sage-test/local/lib 
-Wl,-rpath,/home/jdemeyer/sage-test/local/lib 
build/temp.linux-ppc64le-2.7/subtest.o 
-L/home/jdemeyer/sage-test/local/lib -lpython2.7 -o 
/home/jdemeyer/sage-test/local/var/tmp/sage/build/cython-0.29/src/TEST_TMP/run/reimport_from_subinterpreter/subtest.so

/home/jdemeyer/sage-test/local/var/tmp/sage/build/cython-0.29/src/Cython/Compiler/Main.py:367: 
FutureWarning: Cython directive 'language_level' not set, using 2 for 
now (Py2). This will change in a later release! File: 
/home/jdemeyer/sage-test/local/var/tmp/sage/build/cython-0.29/src/TEST_TMP/run/reimport_from_subinterpreter/package/subtest.pyx
   tree = Parsing.p_module(s, pxd, full_module_name)
/home/jdemeyer/sage-test/local/var/tmp/sage/build/cython-0.29/src/Cython/Compiler/Main.py:367: 
FutureWarning: Cython directive 'language_level' not set, using 2 for 
now (Py2). This will change in a later release! File: 
/home/jdemeyer/sage-test/local/var/tmp/sage/build/cython-0.29/src/TEST_TMP/run/reimport_from_subinterpreter/subtest.pyx
   tree = Parsing.p_module(s, pxd, full_module_name)


/home/jdemeyer/sage-test/local/bin/python2 -c "import subtest; 
subtest.run_main()"
Module loaded: package.subtest



/home/jdemeyer/sage-test/local/bin/python2 -c "import subtest; 
subtest.run_sub()"

Traceback (most recent call last):
   File "<string>", line 1, in <module>
ImportError: No module named package
Traceback (most recent call last):
   File "<string>", line 1, in <module>
   File "subtest.pyx", line 44, in subtest.run_sub
     assert 0 == run_in_subinterpreter(b'import package')
AssertionError


FAIL