fix(heap): eliminate TOCTOU gap in _ExFreePoolWithTracking#9
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Hold TrackingLock across both double-free check and UntrackAllocation to prevent another thread from modifying state between the two operations. CRITICAL_SECTION recursive acquisition allows UntrackAllocation to safely re-enter the lock. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Hold TrackingLock across both double-free check and UntrackAllocation to prevent another thread from modifying state between the two operations. CRITICAL_SECTION recursive acquisition allows UntrackAllocation to safely re-enter the lock.