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Fix gc hole in Frozen.cs #76868

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merged 3 commits into from
Oct 11, 2022
Merged

Fix gc hole in Frozen.cs #76868

merged 3 commits into from
Oct 11, 2022

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EgorBo
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@EgorBo EgorBo commented Oct 11, 2022

Fixes #76856

Confirmed that the test stopped crashing after this change.

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ghost commented Oct 11, 2022

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Issue Details

Closes #76856

Author: EgorBo
Assignees: -
Labels:

area-GC-coreclr

Milestone: -

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ref Unsafe.As<RawData>(obj).Data;

internal static unsafe IntPtr GetMethodTablePointer(object obj) =>
(IntPtr)Unsafe.Add(ref Unsafe.As<byte, IntPtr>(ref obj.GetRawData()), -1);
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This assumes that offset 0 is a valid byref. It happens to be true in CoreCLR today, but it is not a safe assumption to make.

EgorBo and others added 2 commits October 11, 2022 17:51
Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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Thanks for the fix

@EgorBo EgorBo merged commit af63f60 into dotnet:main Oct 11, 2022
@ghost ghost locked as resolved and limited conversation to collaborators Nov 11, 2022
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Test failure: GC\\API\\Frozen\\Frozen\\Frozen.cmd
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