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  1. Lustre
  2. LU-18041

struct obd_uuid is too small for MGC"NID" uuid with IPv6

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: Critical Critical
    • Lustre 2.18.0
    • Lustre 2.16.0, Lustre 2.17.0
    • MGS configured with IPv6 strings that can't be compressed into UUID_MAX size.
    • 3
    • 9223372036854775807

      IPv6 NIDs can vary in size, up to 42 bytes in total when expressed in ASCII and the leading MGC is added to the MGC name, which is slightly larger than struct obd_uuid maximum size UUID_MAX = 40 bytes:
      https://testing.whamcloud.com/test_sets/4ae697a2-d2db-4791-b14e-014bb6e67487

      Lustre: DEBUG MARKER: mount -t lustre -o user_xattr,flock fd33:3981:3213:f010:0:5254:14:c527@tcp:/lustre /mnt/lustre
LustreError: 16630:0:(mgc_request.c:1456:mgc_apply_recover_logs()) mgc: cannot find UUID by nid 'fd33:3981:3213:f010:0:5254:eb:f685@tcp': rc = -2
Lustre: 16630:0:(mgc_request.c:1635:mgc_process_recover_log()) MGCfd33:3981:3213:f010:0:5254:14:c527@tcp: error processing lustre-cliir log recovery: rc = -2
Lustre: 16630:0:(mgc_request.c:1899:mgc_process_log()) MGCfd33:3981:3213:f010:0:5254:14:c527@tcp: IR log lustre-cliir failed, not fatal: rc = -2
LustreError: lustre-MDT0000-mdc-ff12b8ef43b85800: operation mds_connect to node fd33:3981:3213:f010:0:5254:14:c527@tcp failed: rc = -11

      Update places in the kernel where obd_uuid is used for MGS. 

            simmonsja James A Simmons
            simmonsja James A Simmons
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              Created:
              Updated: