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During handover between two gNBs, the AMF enters an invalid state when it receives an unexpected SBI response from the UDM in the process of sending a smf-select-data request. This bug could lead to an AMF crash as the state machine in gmm_state_registration encountered an unknown state. The fix adds explicit handling for SBI messages with resource names such as AM_DATA, SMF_SELECT_DATA, UE_CONTEXT_IN_SMF_DATA, and SDM_SUBSCRIPTIONS. If the HTTP response status is not OK, CREATED, or NO_CONTENT, a warning is logged and the message is ignored. This prevents the AMF from transitioning into an abnormal state and improves overall stability during frequent handovers.
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