Segfault during mutation run

[CyberiaResurrection]

Mutmut version: 22f3924
Python version: 3.9.21
OS: Fedora Linux 41

Repo: https://github.com/makhidkarun/traveller_pyroute

pyproject.toml bits:

paths_to_mutate = ["PyRoute/"]
tests_dir = ["Tests/"]
also_copy = ["Tests/", "PyRoute/Pathfinding/*.so"]
runner = "pytest -x"

After getting past #412 , I'm now actually getting mutants to run - just, at the moment, not cleanly.
Run in question:

  (venv) alex@localhost:~/gitstuf/traveller_pyroute$ mutmut run
⠋ Generating mutants
    done in 51590ms
⠼ Listing all tests 
⠋ Running clean tests
    done
⠼ Running forced fail test
    done
Running mutation testing
⠙ 29999/30093  🎉 24 🫥 29969  ⏰ 0  🤔 0  🙁 6  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007f986014e740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 253 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 102 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_5
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathTreeRegressions.py", line 278 in test_stars_node_types_owned
  File "/usr/lib64/python3.9/unittest/case.py", line 550 in _callTestMethod
  File "/usr/lib64/python3.9/unittest/case.py", line 592 in run
  File "/usr/lib64/python3.9/unittest/case.py", line 651 in __call__
  File "/home/alex/gitstuf/traveller_pyroute/venv/lib64/python3.9/site-packages/_pytest/unittest.py", line 343 in runtest
<elided>
⠇ 30016/30093  🎉 32 🫥 29969  ⏰ 6  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007f986014e740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 337 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_6
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathTreeRegressions.py", line 278 in test_stars_node_types_owned
  File "/usr/lib64/python3.9/unittest/case.py", line 550 in _callTestMethod
  File "/usr/lib64/python3.9/unittest/case.py", line 592 in run
  File "/usr/lib64/python3.9/unittest/case.py", line 651 in __call__
  File "/home/alex/gitstuf/traveller_pyroute/venv/lib64/python3.9/site-packages/_pytest/unittest.py", line 343 in runtest
<elided>
⠼ 30022/30093  🎉 32 🫥 29969  ⏰ 12  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007f986014e740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 421 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_12
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathTreeRegressions.py", line 278 in test_stars_node_types_owned
  File "/usr/lib64/python3.9/unittest/case.py", line 550 in _callTestMethod
  File "/usr/lib64/python3.9/unittest/case.py", line 592 in run
  File "/usr/lib64/python3.9/unittest/case.py", line 651 in __call__
  File "/home/alex/gitstuf/traveller_pyroute/venv/lib64/python3.9/site-packages/_pytest/unittest.py", line 343 in runtest
<elided>
⠴ 30023/30093  🎉 32 🫥 29969  ⏰ 13  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007f986014e740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 435 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_13
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathTreeRegressions.py", line 278 in test_stars_node_types_owned
  File "/usr/lib64/python3.9/unittest/case.py", line 550 in _callTestMethod
  File "/usr/lib64/python3.9/unittest/case.py", line 592 in run
  File "/usr/lib64/python3.9/unittest/case.py", line 651 in __call__
  File "/home/alex/gitstuf/traveller_pyroute/venv/lib64/python3.9/site-packages/_pytest/unittest.py", line 343 in runtest
<elided>
⠧ 30035/30093  🎉 39 🫥 29969  ⏰ 16  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007f986014e740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 589 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_24
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathTreeRegressions.py", line 278 in test_stars_node_types_owned
  File "/usr/lib64/python3.9/unittest/case.py", line 550 in _callTestMethod
  File "/usr/lib64/python3.9/unittest/case.py", line 592 in run
  File "/usr/lib64/python3.9/unittest/case.py", line 651 in __call__
  File "/home/alex/gitstuf/traveller_pyroute/venv/lib64/python3.9/site-packages/_pytest/unittest.py", line 343 in runtest
<elided>
⠏ 30037/30093  🎉 41 🫥 29969  ⏰ 16  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007f986014e740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 631 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_27
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathTreeRegressions.py", line 278 in test_stars_node_types_owned
  File "/usr/lib64/python3.9/unittest/case.py", line 550 in _callTestMethod
  File "/usr/lib64/python3.9/unittest/case.py", line 592 in run
  File "/usr/lib64/python3.9/unittest/case.py", line 651 in __call__
  File "/home/alex/gitstuf/traveller_pyroute/venv/lib64/python3.9/site-packages/_pytest/unittest.py", line 343 in runtest
<elided>
⠋ 30038/30093  🎉 41 🫥 29969  ⏰ 17  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007f986014e740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 645 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_28
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathTreeRegressions.py", line 278 in test_stars_node_types_owned
  File "/usr/lib64/python3.9/unittest/case.py", line 550 in _callTestMethod
  File "/usr/lib64/python3.9/unittest/case.py", line 592 in run
  File "/usr/lib64/python3.9/unittest/case.py", line 651 in __call__
  File "/home/alex/gitstuf/traveller_pyroute/venv/lib64/python3.9/site-packages/_pytest/unittest.py", line 343 in runtest
<elided>
⠇ 30093/30093  🎉 87 🫥 29969  ⏰ 22  🤔 0  🙁 8  🔇 0
0.25 mutations/second

That mutation test(?) rate is also misleading - that run didn't take 200 minutes, as you would expect from 30k mutants at 0.25 mutants/sec, more like 10-15 minutes (at a guess).

Running only testApproximateShortestPathTreeRegressions.py (ie, runner = "pytest -x -k testApproximateShortestPathTreeRegressions") results in the following run output:

(venv) alex@localhost:~/gitstuf/traveller_pyroute$ mutmut run
⠼ Generating mutants
    done in 34385ms
⠇ Listing all tests 
⠼ Running clean tests
    done
⠋ Running forced fail test
    done
Running mutation testing
⠙ 30003/30093  🎉 26 🫥 29969  ⏰ 0  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 253 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 102 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_5
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 56 in test_unified_can_handle_singleton_landmarks
<elided>
⠦ 30018/30093  🎉 35 🫥 29969  ⏰ 5  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 337 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_6
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 56 in test_unified_can_handle_singleton_landmarks
<elided>
⠙ 30023/30093  🎉 37 🫥 29969  ⏰ 8  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 407 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_11
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 180 in test_add_tree_to_unified_forest
<elided>
Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 421 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_12
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 56 in test_unified_can_handle_singleton_landmarks
<elided>
Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 435 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_13
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 56 in test_unified_can_handle_singleton_landmarks
<elided>
⠴ 30037/30093  🎉 44 🫥 29969  ⏰ 13  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 589 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_24
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 56 in test_unified_can_handle_singleton_landmarks
<elided>
⠧ 30039/30093  🎉 46 🫥 29969  ⏰ 13  🤔 0  🙁 8  🔇 0Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 631 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_27
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 56 in test_unified_can_handle_singleton_landmarks
<elided>
Fatal Python error: Segmentation fault

Current thread 0x00007fd491b6c740 (most recent call first):
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 645 in x_explicit_shortest_path_dijkstra_distance_graph__mutmut_28
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 50 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 769 in explicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 56 in x_implicit_shortest_path_dijkstra_distance_graph__mutmut_orig
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 43 in _mutmut_trampoline
  File "/home/alex/gitstuf/traveller_pyroute/mutants/PyRoute/Pathfinding/single_source_dijkstra.py", line 235 in implicit_shortest_path_dijkstra_distance_graph
  File "/home/alex/gitstuf/traveller_pyroute/Tests/Pathfinding/testApproximateShortestPathForest.py", line 56 in test_unified_can_handle_singleton_landmarks
<elided>
⠼ 30093/30093  🎉 93 🫥 29969  ⏰ 15  🤔 0  🙁 8  🔇 0
0.51 mutations/second

As far as I can tell, those tests aren't segfaulting in the clean test run, so am I doing something (else) wrong?

[Otto-AA]

I guess that either because of the mutated code some unexpected arguments are passed to the C code. Or because mutating cython code causes it more or less directly (not sure how exactly cython works, so not sure if this can even happen).

If it is the first case, then e.g. instead of accessing an array at max_index the mutated code accesses max_index + 1 and causes a segmentation fault. You could try to harden the interface to the C code, such that it raises an Exception on invalid inputs rather than segfaulting. Or you could tell mutmut not to mutate the troublesome code (with # pragma: no mutate or the do_not_mutate = [...] config). Or you are fine with segfaults occuring with mutmut. If you have suggestions, please add them to #383 .

And I think it's not yet implemented (see #383), but with mutmut browse you can usually navigate the mutants and apply them to your normal source code (make sure your source code is backed up in git). Then you should be able to reproduce the segfault by running pytest in your directory (you likely need to move the mutants folder somewhere else so pytest does not get confused). Alternatively, look through the .py.meta files in the mutants directory, and find a mutant with exit code -11 (segfault). Then you should be able to run mutmut apply <name of the mutant>.

[Otto-AA]

That mutation test(?) rate is also misleading - that run didn't take 200 minutes, as you would expect from 30k mutants at 0.25 mutants/sec, more like 10-15 minutes (at a guess).

It doesn't count untested mutations, as we do not mutation test them (checking if the mutated code is detected makes no sense if the mutant was not executed during the stats test run). And for the remaining 120 mutants: 4s/mutant * 120 mutants = 8 minutes, so that sounds reasonable.

[CyberiaResurrection]

@Otto-AA , thanks for replying.

I think I'll go the route of hardening either the cython code, or at least its callers, to raise an exception.

How would I go about submitting a PR to mention this little issue in the docs?

[Otto-AA]

I'm not sure yet how we should handle them. We could add segfault to the status (as some kind of emoji) and prevent it from logging these traces if possible.

In the docs, we could add an overview on how to interpret results, something like:

Interpretation:
- (emoji) killed: Success, at least one of the tests fails for this mutant
- (emoji) untested: this mutant is not executed by the specified tests
- (emoji) timeout: running the tests for this mutant took much longer than running them without mutation (infinite-loop prevention)
- (emoji) survived: Failure, the mutated function has been executed by the tests, but all tests pass. Take a look if you should add a test case for this.
- (emoji) suspicious: sus? idk what this is
- (emoji) skipped: not implemented yet? also not sure what this is
- (emoji) segfault: the test run segfaulted. Likely a mutant generated unexpected input to code executed in C, e.g. increasing an index access `last_element` to `last_element + 1`, causing an out-of-bounds read.