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PR #4863 adds Delete Bearer Request handling to release EPC sessions when their UPF becomes unavailable, addressing the stale-session problem reported in issue #4860. However, reselect_upf() iterates over all sessions associated with the failed UPF, including sessions that have not completed establishment. For example, a Create Session Request rejected because UE IP allocation fails can leave a session in the initial state with pfcp_node set but an empty bearer list. A subsequent heartbeat timeout then reaches the new ogs_assert(linked_bearer), causing the SMF to abort. Restrict the EPC release handling to smf_gsm_state_operational before looking up the default bearer. This excludes failed initial sessions and avoids sending Delete Bearer Request for sessions still being established or already being released. The operational state is also the state that handles Delete Bearer Response and continues the session release procedure. Related PR: https://github.com/open5gs/open5gs/pull/4863 Related issue: https://github.com/open5gs/open5gs/issues/4860 |
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