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- FdPassingTest.SocketDoorbellStopsParkingWhenThePeerHangsUp builds a SOCK_STREAM socketpair - deliberately not FdPassing::CreateSocketPair's datagram pair, because only a stream end reports the hangup at all - closes the notifier, and asserts Park returns false, latches Dead(), stays latched, and that a Wait with kWaitForever gives up in under a second instead of spinning. - FdPassingTest.SocketDoorbellStillDeliversTheLastRingBeforeAHangup rings and then closes: detecting death must not swallow the wakeup already sitting in the socket buffer, since the peer's last publish is the one a waiter is most likely to be blocked on. - InProcessTransportTest.AFrameWakeupIsNotEatenByAWaiterOnDescriptors blocks two readers on one endpoint with two different predicates and requires the frame to arrive within 2s rather than "eventually, when a receive timed out". - RingTest.RejectsACapacityTheRecordHeaderCannotDescribe refuses 4 GiB from both roles without mapping anything (the constructor rejects before it touches the base pointer) and keeps 2 GiB accepted as the positive control. - RingTest.DoorbellHandoffWakesBothSidesOnEveryPublish runs 2000 records through the ring with real parking in both directions, in the publish-then- NotifyIfParked order the fences assume. It cannot prove the fence pairing - no test can, since x86 has to actually hold the release store in the store buffer across the flag read - but it exercises the exact call order, and a lost wakeup surfaces as a Wait that times out with work available (a red test) rather than as a hung CI job. - Result: 1429 unit tests pass with MOBILEGL_BUILD_DISAGGREGATED=ON (1424 before this commit; the wire subset is 47), 1382 pass with it OFF, and the same three pre-existing skips appear in both. Every new case was verified to fail with its fix reverted and to pass again with it restored.