Spurious segfault of test_1p_convergence_box

315/545 Test #314: test_1p_convergence_box_conforming .........................***Exception: SegFault  0.55 sec
670Chuck Norris has successfully compiled DuMuX.
671Reading parameters from file params.input.
672 --- Solving finest solution (dx = 0.0125) --- 
673Computed bounding box tree with 12799 nodes for 6400 grid entites in 0.00150703 seconds.
674Colored 6400 elements with 4 colors in 0.001164546 seconds.
675Assemble: r(x^k) = dS/dt + div F - q;   M = grad r -- Using the default temperature of 293.15 in the entire domain. Overload temperatureAtPos() in your spatial params class to define a custom temperature field.Or provide the preferred domain temperature via the SpatialParams.Temperature parameter.
676Update: x^(k+1) = x^k - deltax^kAssemble/solve/update time: 0.0062936(24.8438%)/0.0190219(75.0882%)/1.723e-05(0.0680149%)
677Writing output for problem "test_1p_convergence_box_conforming". Took 0.025 seconds.
678 --- Solving with dx = 10 --- 
679Computed bounding box tree with 199 nodes for 100 grid entites in 2.2181e-05 seconds.
680Colored 100 elements with 4 colors in 2.577e-05 seconds.
681Assemble: r(x^k) = dS/dt + div F - q;   M = grad r[runner-d5rncghq-project-31-concurrent-0:03562] *** Process received signal ***
682[runner-d5rncghq-project-31-concurrent-0:03562] Signal: Segmentation fault (11)
683[runner-d5rncghq-project-31-concurrent-0:03562] Signal code: Address not mapped (1)
684[runner-d5rncghq-project-31-concurrent-0:03562] Failing at address: 0x8
685[runner-d5rncghq-project-31-concurrent-0:03562] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x14420)[0x7f3da283b420]
686[runner-d5rncghq-project-31-concurrent-0:03562] [ 1] /lib/x86_64-linux-gnu/libstdc++.so.6(_ZSt18_Rb_tree_decrementPSt18_Rb_tree_node_base+0xe)[0x7f3da220125e]
687

Most likely some multithreading issue. test_1p_convergence_box_nonconforming has the same spurious failures. Here is another one from master.

315/545 Test #315: test_1p_convergence_box_nonconforming ......................***Exception: SegFault  0.58 sec
Let's get the cow off the ice.
Reading parameters from file params.input.
 --- Solving finest solution (dx = 0.0125) --- 
Computed bounding box tree with 12799 nodes for 6400 grid entites in 0.00205371 seconds.
Colored 6400 elements with 4 colors in 0.001878195 seconds.
Assemble: r(x^k) = dS/dt + div F - q;   M = grad r -- Using the default temperature of 293.15 in the entire domain. Overload temperatureAtPos() in your spatial params class to define a custom temperature field.Or provide the preferred domain temperature via the SpatialParams.Temperature parameter.
Update: x^(k+1) = x^k - deltax^kAssemble/solve/update time: 0.00675025(21.4533%)/0.0246765(78.4254%)/3.819e-05(0.121373%)
Writing output for problem "test_1p_convergence_box_conforming". Took 0.049 seconds.
 --- Solving with dx = 10 --- 
Computed bounding box tree with 199 nodes for 100 grid entites in 2.8831e-05 seconds.
Colored 100 elements with 4 colors in 3.9071e-05 seconds.
Assemble: r(x^k) = dS/dt + div F - q;   M = grad r[runner-d5rncghq-project-31-concurrent-0:03605] *** Process received signal ***
[runner-d5rncghq-project-31-concurrent-0:03605] Signal: Segmentation fault (11)
[runner-d5rncghq-project-31-concurrent-0:03605] Signal code: Address not mapped (1)
[runner-d5rncghq-project-31-concurrent-0:03605] Failing at address: 0x8
[runner-d5rncghq-project-31-concurrent-0:03605] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x14420)[0x7f44a89eb420]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 1] /lib/x86_64-linux-gnu/libstdc++.so.6(_ZSt18_Rb_tree_decrementPSt18_Rb_tree_node_base+0xe)[0x7f44a83b125e]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 2] /builds/dumux-repositories/dumux/build-cmake/test/porousmediumflow/1p/convergence/discretesolution/test_1p_convergence_box(+0xde397)[0x56271ee9a397]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 3] /builds/dumux-repositories/dumux/build-cmake/test/porousmediumflow/1p/convergence/discretesolution/test_1p_convergence_box(+0xdea8f)[0x56271ee9aa8f]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 4] /builds/dumux-repositories/dumux/build-cmake/test/porousmediumflow/1p/convergence/discretesolution/test_1p_convergence_box(+0x103083)[0x56271eebf083]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 5] /builds/dumux-repositories/dumux/build-cmake/test/porousmediumflow/1p/convergence/discretesolution/test_1p_convergence_box(+0x105f82)[0x56271eec1f82]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 6] /lib/x86_64-linux-gnu/libgomp.so.1(+0x1a78e)[0x7f44a896b78e]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 7] /lib/x86_64-linux-gnu/libpthread.so.0(+0x8609)[0x7f44a89df609]
[runner-d5rncghq-project-31-concurrent-0:03605] [ 8] /lib/x86_64-linux-gnu/libc.so.6(clone+0x43)[0x7f44a80b0133]
[runner-d5rncghq-project-31-concurrent-0:03605] *** End of error message ***