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fix(ulcl): fix PSA2 selection failure in two-anchor topology#224

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free5gc:mainfrom
lpoclin:fix/ulcl-two-anchor-psa-selection
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fix(ulcl): fix PSA2 selection failure in two-anchor topology#224
lpoclin wants to merge 1 commit into
free5gc:mainfrom
lpoclin:fix/ulcl-two-anchor-psa-selection

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@lpoclin

@lpoclin lpoclin commented Jun 12, 2026

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In a two-anchor ULCL topology, PSA2 is never selected and the ULCL is never established. Three fixes:

  1. SelectPSA2 checked for N3 on the PSA anchor last node. PSA anchors only have N9, so every candidate was skipped. Removed the N3 check.

  2. FindULCL advances psa1CurDPNode without a nil guard. Added nil check to prevent panic when PSA1 is a prefix of PSA2.

  3. bpMGR.ULCL not checked for nil after FindULCL. Added guard before downstream PFCP calls.

Tested on free5GC v4.2.2, Kubernetes, Multus CNI. Related to issue reported on the community forum.

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