RRCSetup in response to RRCReestablishment request not working with OAI UE Steps to reproduce: 1. Apply [diff.diff](/uploads/0e8bb5d77c7c158251b3363e56c1efd1/diff.diff) and build OAI: ``` cd ~/openairinterface5g/cmake_targets/ ./build_oai --gNB --nrUE --ninja -w USRP -C ``` 2. Start CN 3. Start gNB with: ``` cd ~/openairinterface5g/cmake_targets/ran_build/build sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --gNBs.[0].min_rxtxtime 4 --rfsim ``` 4. Start UE with: ``` cd ~/openairinterface5g/cmake_targets/ran_build/build sudo ./nr-uesoftmodem --band 78 -C 3619200000 -r 106 --numerology 1 --ssb 516 --rfsim -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/ue.conf ``` 5. Wait for a RRCReestablishment procedure 6. There is no LCID 4 anymore and at the UE: `[RLC] Radio Bearer (channel ID 1) is NULL for UE 0` Note: Ensure that UE gets PDUSession and LCID4 before the RRCReestablishment, if not, check CN configurations. Note 2: This issue was found with USRPs, so it is not exclusive to RFsim Note 3: The patch and the way the issue is triggered is just a way to reproduce it, in real scenario the issue happens, for example, because of real time issues (a.k.a. LLLLLLLLLLLLLLLLLLLLLs). Logs for reference: [gNB.txt](/uploads/4aa6d596ded1bfc2bacc59fdf4744e20/gNB.txt) [ue.txt](/uploads/5a8529de318895bcec2b942a976022aa/ue.txt)