[LU-18041] struct obd_uuid is too small for MGC"NID" uuid with IPv6

• Type: Bug
• Resolution: Unresolved
• Priority: Critical
• Fix Version/s: Lustre 2.17.0
• Affects Version/s: Lustre 2.16.0, Lustre 2.17.0
• Labels: IPv6 tstu_ipv6
• Environment: MGS configured with IPv6 strings that can't be compressed into UUID_MAX size.
• Severity: 3
• Assignee: James A Simmons
• Reporter: James A Simmons

Description

IPv6 can vary in size up to 42 bytes in total which is way larger than obd_uuid size:
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. 

Issue Links

• is related to: LU-18210 sanityn test 113: fails with cannot find mgc of nid
• is related to: LU-17594 Simplify ptlrpc_connection handling
• is related to: LU-18417 Finish IPv6 support
• is related to: LU-10359 remove NIDs from config llogs
• is related to: LU-18884 make LWP setup based on IR instead of client config
• is related to: LU-19360 lustre-initialization: IPv6 "Failed to get NID for server"
• is related to: LU-10391 LNET: Support IPv6