[MNT]: Memory Leak detected with ASan

Summary

I was trying to use address sanitizer to build scipy with meson (rgommers/scipy#32) and found few failures coming from matplotlib.
The traceback of the failures are:

Failure 1

scipy/cluster/tests/test_hierarchy.py .................................. [  0%]
..............................................Fatal Python error: Aborted

Current thread 0x00007faa364ac740 (most recent call first):
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/_layoutgrid.py", line 80 in <listcomp>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/_layoutgrid.py", line 80 in __init__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 3082 in init_layoutgrid
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 2434 in set_constrained_layout
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 2279 in __init__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 3544 in new_figure_manager
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/pyplot.py", line 316 in new_figure_manager
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/pyplot.py", line 797 in figure
  File "/home/smit/Smitlunagariya/scipy/installdir/lib/python3.9/site-packages/scipy/cluster/tests/test_hierarchy.py", line 830 in test_valid_label_size
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/python.py", line 183 in pytest_pyfunc_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/python.py", line 1641 in runtest
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 162 in pytest_runtest_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 255 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 311 in from_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 254 in call_runtest_hook
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 215 in call_and_report
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 126 in runtestprotocol
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 109 in pytest_runtest_protocol
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 348 in pytest_runtestloop
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 323 in _main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 269 in wrap_session
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 316 in pytest_cmdline_main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/config/__init__.py", line 162 in main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/config/__init__.py", line 185 in console_main
  File "/home/smit/anaconda3/envs/scipy-dev/bin/pytest", line 11 in <module>
Aborted (core dumped)

Failure 2

scipy/spatial/tests/test__plotutils.py Fatal Python error: Aborted

Current thread 0x00007f0755dac740 (most recent call first):
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/_layoutgrid.py", line 80 in <listcomp>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/_layoutgrid.py", line 80 in __init__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 3082 in init_layoutgrid
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 2434 in set_constrained_layout
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 2279 in __init__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 3544 in new_figure_manager
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/pyplot.py", line 316 in new_figure_manager
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/pyplot.py", line 797 in figure
  File "/home/smit/Smitlunagariya/scipy/installdir/lib/python3.9/site-packages/scipy/spatial/tests/test__plotutils.py", line 22 in test_delaunay
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/python.py", line 183 in pytest_pyfunc_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/python.py", line 1641 in runtest
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 162 in pytest_runtest_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 255 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 311 in from_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 254 in call_runtest_hook
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 215 in call_and_report
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 126 in runtestprotocol
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 109 in pytest_runtest_protocol
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 348 in pytest_runtestloop
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 323 in _main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 269 in wrap_session
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 316 in pytest_cmdline_main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/config/__init__.py", line 162 in main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/config/__init__.py", line 185 in console_main
  File "/home/smit/anaconda3/envs/scipy-dev/bin/pytest", line 11 in <module>
Aborted (core dumped)

Failure 3

scipy/stats/tests/test_morestats.py .................................... [ 77%]
........................................................................ [ 79%]
...................xxx...Fatal Python error: Aborted

Current thread 0x00007fd763d6d740 (most recent call first):
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/_layoutgrid.py", line 80 in <listcomp>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/_layoutgrid.py", line 80 in __init__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 3082 in init_layoutgrid
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 2434 in set_constrained_layout
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/figure.py", line 2279 in __init__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 3544 in new_figure_manager
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/pyplot.py", line 316 in new_figure_manager
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/matplotlib/pyplot.py", line 797 in figure
  File "/home/smit/Smitlunagariya/scipy/installdir/lib/python3.9/site-packages/scipy/stats/tests/test_morestats.py", line 1248 in test_plot_kwarg
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/python.py", line 183 in pytest_pyfunc_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/python.py", line 1641 in runtest
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 162 in pytest_runtest_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 255 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 311 in from_call
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 254 in call_runtest_hook
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 215 in call_and_report
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 126 in runtestprotocol
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/runner.py", line 109 in pytest_runtest_protocol
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 348 in pytest_runtestloop
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 323 in _main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 269 in wrap_session
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/main.py", line 316 in pytest_cmdline_main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/config/__init__.py", line 162 in main
  File "/home/smit/anaconda3/envs/scipy-dev/lib/python3.9/site-packages/_pytest/config/__init__.py", line 185 in console_main
  File "/home/smit/anaconda3/envs/scipy-dev/bin/pytest", line 11 in <module>
Aborted (core dumped)

SciPy was build and tested on https://github.com/rgommers/scipy/tree/meson using: $ meson setup -Db_sanitize=address build --prefix=$PWD/installdir

Version used:

matplotlib                3.4.2
matplotlib-base           3.4.2 
matplotlib-inline         0.1.2

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[MNT]: Memory Leak detected with ASan #20858

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[MNT]: Memory Leak detected with ASan #20858

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