[MME] Race condition between S1AP and S6A #3057
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Assume the UE has Attached, the session has been created, and is in the IDLE state with the UEContextRelease process. This could result in the following call flow. 1. TAU request without Integrity Protected 2. Authentication request/response 3. Security-mode command/complete MME can be performed simultaneously by the HSS(S6A) and UE(S1AP). Update-Location-Request Service request Service reject Delete Session Request Delete Session Response Update-Location-Answer UEContextReleaseCommand for Service reject TAU reject UEContextReleaseCommand for TAU reject UEContextReleaseComplete UEContextReleaseComplete MME crashes when UE sends a service request(S1AP) during ULR/ULA(S6A) with HSS, which has been fixed.
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Assume the UE has Attached, the session has been created, and is in the IDLE state with the UEContextRelease process.
This could result in the following call flow.
MME can be performed simultaneously by the HSS(S6A) and UE(S1AP).
MME crashes when UE sends a service request(S1AP) during ULR/ULA(S6A) with HSS, which has been fixed.