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[Bug]: PGF backend crashes at program exit after creating a plot #27437

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Labels
OS: MicrosoftRelease criticalFor bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.backend: pgf
Milestone
@startrekdude

Description

@startrekdude

Bug summary

After successfully creating a plot using the PGF backend, Python will crash on exit while running cleanup code.

Code for reproduction

importmatplotlibmatplotlib.use("pgf")importmatplotlib.pyplotaspltfig,ax=plt.subplots(1,1)ax.plot(list(range(100)), [x*2forxinrange(100)])fig.savefig("test.pgf",format="pgf")

Actual outcome

Two exceptions are produced at exit. The first is:

Traceback (most recent call last):  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\weakref.py", line 666, in _exitfunc    f()  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\weakref.py", line 590, in __call__    return info.func(*info.args, **(info.kwargs or {}))           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "C:\Users\Anon\Desktop\Projects\mplbug\venv\Lib\site-packages\matplotlib\backends\backend_pgf.py", line 277, in finalize_latex    latex.communicate()  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\subprocess.py", line 1209, in communicate    stdout, stderr = self._communicate(input, endtime, timeout)                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\subprocess.py", line 1610, in _communicate    self.stdout_thread.start()  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\threading.py", line 971, in start    _start_new_thread(self._bootstrap, ())RuntimeError: can't create new thread at interpreter shutdown

The second, which will not be produced if time elapses between plot creation and program exit (read: a sleep(0.5) call), is:

Traceback (most recent call last):  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\shutil.py", line 634, in _rmtree_unsafe    os.unlink(fullname)PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\Anon\\AppData\\Local\\Temp\\tmp4qorphqa\\texput.aux'During handling of the above exception, another exception occurred:Traceback (most recent call last):  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\tempfile.py", line 891, in onexc    _os.unlink(path)PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\Anon\\AppData\\Local\\Temp\\tmp4qorphqa\\texput.aux'During handling of the above exception, another exception occurred:Traceback (most recent call last):  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\weakref.py", line 666, in _exitfunc    f()  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\weakref.py", line 590, in __call__    return info.func(*info.args, **(info.kwargs or {}))           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\tempfile.py", line 923, in cleanup    self._rmtree(self.name, ignore_errors=self._ignore_cleanup_errors)  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\tempfile.py", line 903, in _rmtree    _shutil.rmtree(name, onexc=onexc)  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\shutil.py", line 796, in rmtree    return _rmtree_unsafe(path, onexc)           ^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\shutil.py", line 636, in _rmtree_unsafe    onexc(os.unlink, fullname, err)  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\tempfile.py", line 894, in onexc    cls._rmtree(path, ignore_errors=ignore_errors)  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\tempfile.py", line 903, in _rmtree    _shutil.rmtree(name, onexc=onexc)  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\shutil.py", line 796, in rmtree    return _rmtree_unsafe(path, onexc)           ^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\shutil.py", line 612, in _rmtree_unsafe    onexc(os.scandir, path, err)  File "C:\Users\Anon\AppData\Local\Programs\Python\Python312\Lib\shutil.py", line 609, in _rmtree_unsafe    with os.scandir(path) as scandir_it:         ^^^^^^^^^^^^^^^^NotADirectoryError: [WinError 267] The directory name is invalid: 'C:\\Users\\Anon\\AppData\\Local\\Temp\\tmp4qorphqa\\texput.aux'

Expected outcome

No crashes.

Additional information

Workaround that prevents both exceptions is runningweakref.finalize._exitfunc() before program exit.
Workaround that prevents the second exception only is letting time elapse before program exit (like with atime.sleep(0.5) call).

Operating system

Windows 11 Enterprise 22H2

Matplotlib Version

3.8.2

Matplotlib Backend

pgf

Python version

3.12.0

Jupyter version

No response

Installation

pip

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    OS: MicrosoftRelease criticalFor bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.backend: pgf

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