8000 Fix access violation exception on shutdown by Frawak · Pull Request #2386 · pythonnet/pythonnet · GitHub
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Fix access violation exception on shutdown #2386

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Merged
merged 4 commits into from
Aug 6, 2024
Merged

Fix access violation exception on shutdown #2386

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4e5afdf
Fix access violation exception on shutdown (#1977)
Frawak May 13, 2024
6f0f671
Restrict first garbage collection
Frawak May 13, 2024
c99cdf3
Throw exception trying to add a reflected object after the hashset is…
Frawak Jul 8, 2024
6cdd6d7
Move reflected object creation block
Frawak Aug 5, 2024
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Restrict first garbage collection 
Otherwise, collecting all at this earlier point results in corrupt memory for derived types.
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@Frawak
Frawak committed May 13, 2024
commit 6f0f6713e8f55a24ea7803584c5490eca0518739
8 changes: 4 additions & 4 deletions src/runtime/Finalizer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -191,7 +191,7 @@ internal static void Shutdown()
Instance.started = false;
}

internal nint DisposeAll()
internal nint DisposeAll(bool disposeObj = true, bool disposeDerived = true, bool disposeBuffer = true)
{
if (_objQueue.IsEmpty && _derivedQueue.IsEmpty && _bufferQueue.IsEmpty)
return 0;
Expand All @@ -216,7 +216,7 @@ internal nint DisposeAll()

try
{
while (!_objQueue.IsEmpty)
if (disposeObj) while (!_objQueue.IsEmpty)
{
if (!_objQueue.TryDequeue(out var obj))
continue;
Expand All @@ -240,7 +240,7 @@ internal nint DisposeAll()
}
}

while (!_derivedQueue.IsEmpty)
if (disposeDerived) while (!_derivedQueue.IsEmpty)
{
if (!_derivedQueue.TryDequeue(out var derived))
continue;
Expand All @@ -258,7 +258,7 @@ internal nint DisposeAll()
collected++;
}

while (!_bufferQueue.IsEmpty)
if (disposeBuffer) while (!_bufferQueue.IsEmpty)
{
if (!_bufferQueue.TryDequeue(out var buffer))
continue;
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10 changes: 7 additions & 3 deletions src/runtime/Runtime.cs
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Expand Up @@ -278,7 +278,8 @@ internal static void Shutdown()
ClearClrModules();
RemoveClrRootModule();

TryCollectingGarbage(MaxCollectRetriesOnShutdown, forceBreakLoops: true);
TryCollectingGarbage(MaxCollectRetriesOnShutdown, forceBreakLoops: true,
obj: true, derived: false, buffer: false);

NullGCHandles(ExtensionType.loadedExtensions);
ClassManager.RemoveClasses();
Expand Down Expand Up @@ -329,7 +330,8 @@ internal static void Shutdown()

const int MaxCollectRetriesOnShutdown = 20;
internal static int _collected;
static bool TryCollectingGarbage(int runs, bool forceBreakLoops)
static bool TryCollectingGarbage(int runs, bool forceBreakLoops,
bool obj = true, bool derived = true, bool buffer = true)
{
if (runs <= 0) throw new ArgumentOutOfRangeException(nameof(runs));

Expand All @@ -342,7 +344,9 @@ static bool TryCollectingGarbage(int runs, bool forceBreakLoops)
GC.Collect();
GC.WaitForPendingFinalizers();
pyCollected += PyGC_Collect();
pyCollected += Finalizer.Instance.DisposeAll();
pyCollected += Finalizer.Instance.DisposeAll(disposeObj: obj,
disposeDerived: derived,
disposeBuffer: buffer);
}
if (Volatile.Read(ref _collected) == 0 && pyCollected == 0)
{
Expand Down
0