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This can happen if a UE never sends the UE Network Capabilities IE (eg Attach or TAU) when coming from 2G to 4G: """ 08/21 11:45:31.476: [emm] DEBUG: emm_state_security_mode(): ENTRY (/open5gs/src/mme/emm-sm.c:1162) 08/21 11:45:31.476: [mme] DEBUG: [262420000000007] Security mode command (/open5gs/src/mme/nas-path.c:336) 08/21 11:45:31.476: [emm] DEBUG: Replayed UE SEC[LEN:2 EEA:0x0 EIA:0x0 UEA:0x0 UIA:0x0 GEA:0x0] (/open5gs/src/mme/emm-build.c:385) 08/21 11:45:31.476: [emm] DEBUG: Selected[Integrity:0x0 Encrypt:0x0] (/open5gs/src/mme/emm-build.c:393) 08/21 11:45:31.476: [emm] ERROR: Encrypt[0x0] can be skipped with EEA0, but Integrity[0x0] cannot be bypassed with EIA0 (/open5gs/src/mme/emm-build.c:447) 08/21 11:45:31.476: [mme] ERROR: emm_build_security_mode_command() failed (/open5gs/src/mme/nas-path.c:343) 08/21 11:45:31.476: [emm] ERROR: emm_state_security_mode: Expectation `r == OGS_OK' failed. (/open5gs/src/mme/emm-sm.c:1171) """ Instead of crashing the MME, fail gracefuly sending a UeContextReleaseCommand.
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