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Fixed crash in finalizer of CLR types defined in Python, that survive engine shutdown#1260

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Merged
filmor merged 1 commit intopythonnet:masterfromlosttech:bugs/1256
Dec 18, 2020

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@lostmsu
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What does this implement/fix? Explain your changes.

During engine shutdown all links from Python to .NET instances are severed. If an instance of CLR class defined in Python survives the shutdown (for example, a reference is stored in static field) and later gets finalized, it will attempt to severe link again, which is an invalid operation.

The fix is to check if the link has already been severed and skip that step during finalization.

Additionally in this change: refactoredMoveClrInstancesOnwershipToPython

Does this close any currently open issues?

#1256

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Check all those that are applicable and complete.

  • Make sure to include one or more tests for your change
  • If an enhancement PR, please create docs and at best an example
  • Add yourself toAUTHORS
  • Updated theCHANGELOG

@lostmsulostmsuforce-pushed thebugs/1256 branch 4 times, most recently from9498c07 to927f980CompareOctober 13, 2020 17:26
@lostmsu
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lostmsu commentedOct 13, 2020•
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Interesting. It appears, that the fix is legitimate, but the test for it causes segfault in soft shutdown mode with xplat. Which probably means it is caused by a separate issue :/

@codecov-io
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codecov-io commentedOct 13, 2020•
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Codecov Report

Merging#1260 intomaster willnot change coverage.
The diff coverage isn/a.

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@@           Coverage Diff           @@##           master    #1260   +/-   ##=======================================  Coverage   86.25%   86.25%           =======================================  Files           1        1             Lines         291      291           =======================================  Hits          251      251             Misses         40       40
FlagCoverage Δ
#setup_linux64.94% <ø> (ø)
#setup_windows72.50% <ø> (ø)

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@lostmsu
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@amos402 I could see it being freed by one oftp_clear ortp_dealloc and then again by finalizer.

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GCHandlegc=GCHandle.Alloc(self,GCHandleType.Weak);
Marshal.WriteIntPtr(self.pyHandle,ObjectOffset.magic(self.tpHandle),(IntPtr)gc);
self.gcHandle.Free();
self.gcHandle=gc;

It set by a weak GCHandle instead after it freed.

@tminka
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I have successfully avoided the problem mentioned by@amos402above via the followingcommit.

… engine shutdownpythonnet#1256pythonnet#1256During engine shutdown all links from Python to .NET instances are severed. If an instance of CLR class defined in Python survives the shutdown (for example, a reference is stored in static field) and later gets finalized, it will attempt to severe link again, which is an invalid operation.The fix is to check if the link has already been severed and skip that step during finalization.
@filmorfilmor merged commite2ab3ae intopythonnet:masterDec 18, 2020
BadSingleton pushed a commit to Unity-Technologies/pythonnet that referenced this pull requestDec 18, 2020
… engine shutdown (pythonnet#1260)pythonnet#1256pythonnet#1256During engine shutdown all links from Python to .NET instances are severed. If an instance of CLR class defined in Python survives the shutdown (for example, a reference is stored in static field) and later gets finalized, it will attempt to severe link again, which is an invalid operation.The fix is to check if the link has already been severed and skip that step during finalization.
BadSingleton pushed a commit to Unity-Technologies/pythonnet that referenced this pull requestDec 18, 2020
… engine shutdown (pythonnet#1260)pythonnet#1256pythonnet#1256During engine shutdown all links from Python to .NET instances are severed. If an instance of CLR class defined in Python survives the shutdown (for example, a reference is stored in static field) and later gets finalized, it will attempt to severe link again, which is an invalid operation.The fix is to check if the link has already been severed and skip that step during finalization.
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@lostmsu@codecov-io@amos402@tminka@filmor
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