_collModInternal has a cmrNew variable that is used in a writeConflictRetry loop, but initialized before the loop begins. Usage of cmrNew must be very careful not to access memory that can become invalid (freed) after an onRollback call caused by a WriteConflictException. After SERVER-9306, we try to access cmrNew.idx (the unsafe pointer) before initializing it again in the writeConflictRetry loop. The old code, prior to SERVER-9306, did not make this mistake: the access used to be after initializing the pointer, so the pointer was safe for use at that point.
- is caused by
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SERVER-9306 Ability to temporarily forbid query optimizer from using index ("invisible index")
- Closed