[LU-14312] Interop: sanity test 272b fails with 'failed to migrate to the new composite layout'

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Affects Version/s: Lustre 2.14.0
• Labels: interop
• Severity: 3
• Assignee: Mikhail Pershin
• Reporter: James Nunez (Inactive)

Description

sanity test_272b fails for interop testing between a master, future 2.14.0, client and older (< 2.13.56 ) servers starting on 01 NOV 2020 for Lustre 2.13.56.63.

Looking at a recent failure at https://testing.whamcloud.com/test_sets/6e4f8226-6269-4979-a03f-af7e98a714be, we see from the suite_log that there is an issue with getting a lock for a DoM file

== sanity test 272b: DoM migration: DOM file to the OST-striped file (plain) ========================= 03:42:54 (1608781374)
CMD: trevis-19vm4 lctl get_param -n osd*.*MDT0000.kbytesfree
1+0 records in
1+0 records out
2097152 bytes (2.1 MB, 2.0 MiB) copied, 0.0255055 s, 82.2 MB/s
CMD: trevis-19vm4 lctl get_param -n osd*.*MDT0000.kbytesfree
error: lfs migrate: /mnt/lustre/d272b.sanity/dom: data copy failed: No locks available
 sanity test_272b: @@@@@@ FAIL: failed to migrate to the new composite layout 
  Trace dump:
  = /usr/lib64/lustre/tests/test-framework.sh:6273:error()
  = /usr/lib64/lustre/tests/sanity.sh:20792:test_272b()

Looking at patches that landed during this time related to DoM and locks, we see two related patches:
0a3c72f13045 LU-13645 ldlm: extra checks for DOM locks
067404403634 LU-13645 ldlm: group locks for DOM IBIT lock

Logs for more failures are at
https://testing.whamcloud.com/test_sets/87ee1f60-3a95-411f-af39-9ce5095c85bb
https://testing.whamcloud.com/test_sets/dab54121-a23a-4809-9a3c-93f05b40ecad
https://testing.whamcloud.com/test_sets/9bcc5049-96f5-40c9-9cc1-55ef00f350d7