Fix createdump DAC segfault #29892
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Fix createdump DAC segfault #29892
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kouvel
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Mar 2, 2020
- Commit 1 - Reverts commit f954c6b, which reverted PR dotnet#1457 due to issues - Commit 2 - Fixes crashes and assertion failures seen by the original change, fixes dotnet#29934 - The crashes were caused by commit dotnet@6aa3c70 in the original PR - Call counting infos cannot be deleted when the corresponding call counting stubs may still run, because: - The remaining call count decremented by the stub is in the call counting info - The only way to get a code version / method desc from a stub is to go through the call counting info - Got one repro of the assertion failure in dotnet#22786 and it is most likely caused by the same issue, following heap corruption from modifying a deleted call counting info where the memory is reused for a `NativeCodeVersionNode`, messing up the method desc pointer - Fixed with a partial revert of the above commit. Added back the `Complete` stage and then call counting infos are deleted only after it's ensured that call counting stubs won't be used (shortly before deleting them). - Commit 3 - Public static functions of `CallCountingManager` that may be called through the debugger may occur before static initialization, added a check for null as suggested in dotnet#29892
kouvel
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Mar 3, 2020
* Improve call counting mechanism - Commit 1 - Reverts commit f954c6b, which reverted PR #1457 due to issues - Commit 2 - Fixes crashes and assertion failures seen by the original change, fixes #29934 - The crashes were caused by commit 6aa3c70 in the original PR - Call counting infos cannot be deleted when the corresponding call counting stubs may still run, because: - The remaining call count decremented by the stub is in the call counting info - The only way to get a code version / method desc from a stub is to go through the call counting info - Got one repro of the assertion failure in #22786 and it is most likely caused by the same issue, following heap corruption from modifying a deleted call counting info where the memory is reused for a `NativeCodeVersionNode`, messing up the method desc pointer - Fixed with a partial revert of the above commit. Added back the `Complete` stage and then call counting infos are deleted only after it's ensured that call counting stubs won't be used (shortly before deleting them). - Commit 3 - Public static functions of `CallCountingManager` that may be called through the debugger may occur before static initialization, added a check for null as suggested in #29892 * Fix crashes and assertion failures seen by the original change * Add check for null for some functions callable from the debugger
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Need to check s_callCountingManagers is not null in the CallCountingManager enumerate memory function.