Bug#850559: dune-pdelab: FTBFS (not enough slots available)

[Santiago Vila]

Package: src:dune-pdelab
Version: 2.5.0~20161204gdb53a76-3
Severity: serious

Dear maintainer:

I tried to build this package in stretch with "dpkg-buildpackage -A"
but it failed:

--------------------------------------------------------------------------------
[...]
 debian/rules build-indep
dh build-indep --parallel --builddirectory=build
   dh_testdir -i -O--parallel -O--builddirectory=build
   dh_update_autotools_config -i -O--parallel -O--builddirectory=build
   debian/rules override_dh_auto_configure
make[1]: Entering directory '/<<PKGBUILDDIR>>'
dh_auto_configure -- -DBUILD_SHARED_LIBS=1
	cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_BUILD_TYPE=None -DCMAKE_INSTALL_SYSCONFDIR=/etc -DCMAKE_INSTALL_LOCALSTATEDIR=/var -DBUILD_SHARED_LIBS=1
-- The C compiler identification is GNU 6.2.1
-- The CXX compiler identification is GNU 6.2.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done

[... snipped ...]

Status:    FAILED
Output:
           --------------------------------------------------------------------------
           There are not enough slots available in the system to satisfy the 2 slots
           that were requested by the application:
             testnonoverlappingsinglephaseflow-ug
           
           Either request fewer slots for your application, or make more slots available
           for use.
           --------------------------------------------------------------------------

======================================================================
Name:      testnonoverlappingsinglephaseflow-boilerplate-mpi-2
FullName:  ./dune/pdelab/test/testnonoverlappingsinglephaseflow-boilerplate-mpi-2
Status:    FAILED
Output:
           --------------------------------------------------------------------------
           There are not enough slots available in the system to satisfy the 2 slots
           that were requested by the application:
             testnonoverlappingsinglephaseflow-boilerplate
           
           Either request fewer slots for your application, or make more slots available
           for use.
           --------------------------------------------------------------------------

======================================================================
Name:      testnonoverlapping-mpi-2
FullName:  ./dune/pdelab/test/testnonoverlapping-mpi-2
Status:    FAILED
Output:
           --------------------------------------------------------------------------
           There are not enough slots available in the system to satisfy the 2 slots
           that were requested by the application:
             testnonoverlapping
           
           Either request fewer slots for your application, or make more slots available
           for use.
           --------------------------------------------------------------------------

/usr/share/dune/dune-debian.mk:16: recipe for target 'override_dh_auto_test' failed
make[1]: *** [override_dh_auto_test] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
debian/rules:6: recipe for target 'build-indep' failed
make: *** [build-indep] Error 2
dpkg-buildpackage: error: debian/rules build-indep gave error exit status 2
--------------------------------------------------------------------------------

This is how the build ends, and also the relevant part.

The bug should be reproducible with sbuild on a single CPU virtual machine.

Thanks.