[release/9.0] Initialize m_fInPlaceSS #109013
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A recent fix added a new field to the DebuggerPatchSkip object and missed initializing it false. This causes the new in-place patch skipping logic activate at random depending on the value of uninitialized memory. Fixing this by initializing the variable.
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Tagging subscribers to this area: @tommcdon |
tommcdon
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Oct 18, 2024
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All failures seem to be #108994. |
This was referenced Oct 18, 2024
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Backport of #109008 to release/9.0
/cc @noahfalk
Customer Impact
When debugging a .NET app in Visual Studio or other managed debugger and continuing for a breakpoint or step, the debuggee application may crash with an ExecutionEngineException non-deterministically. The non-determinism comes from reading an uninitialized boolean. If it happens to be non-zero the runtime may execute some code that leads to a crash. The exact set of factors and code-flow that creates the crash is still under investigation but exploratory testing suggests crashes may occur relatively frequently if the uninitialized memory value happens to be non-zero.
Regression
#108872
Testing
So far the fix has only been code reviewed by me (Noah), and validated against our standard debugging tests. CI regression tests are in progress.
Risk
Very low - the fix initializes an uninitialized variable.