[release/10.0] Publish GCHandle assignments with release semantics - #130224
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GC handles can be observed by other threads after assignment. On weakly ordered ARM64 systems, a plain store to the handle slot can publish the object reference before prior object initialization writes are visible to the observing thread. Use VolatileStore when assigning handle slots in HndAssignHandle and HndAssignHandleGC so the handle publication is a release store. This matches the runtime's volatile publication pattern and prevents weak-reference readers from seeing partially initialized objects.
AaronRobinsonMSFT
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Jul 6, 2026
JulieLeeMSFT
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Backport of #130213 to release/10.0
/cc @jkotas @BradBarnich
Customer Impact
Stress failure found on Arm64 caused by weak memory model
Regression
Testing
Customer validated the fix in the affected workload
Risk
Low.