[LU-12181] interop: sanity test 271a fails with 'Unexpected 2 READ RPCs'

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Affects Version/s: Lustre 2.12.1, Lustre 2.12.4
• Labels: interop
• Environment: 2.12.1 servers and 2.11.0 clients
• Severity: 3
• Assignee: WC Triage
• Reporter: James Nunez (Inactive)

Description

sanity test 271 fails in interop testing with the message 'Unexpected 2 READ RPCs'. So far, we are only seeing this test fail between 2.12.1 (2.12.0.28, 2.12.0.52 and 2.12.0.82) servers and 2.11.0 clients.

Looking at the suite_log for a recent failure, https://testing.whamcloud.com/test_sets/924740aa-5a9b-11e9-9720-52540065bddc , we see

== sanity test 271a: DoM: data is cached for read after write ======================================== 10:21:45 (1554718905)
CMD: trevis-37vm12 /usr/sbin/lctl get_param -n version 2>/dev/null ||
				/usr/sbin/lctl lustre_build_version 2>/dev/null ||
				/usr/sbin/lctl --version 2>/dev/null | cut -d' ' -f2
1+0 records in
1+0 records out
4096 bytes (4.1 kB) copied, 0.000648776 s, 6.3 MB/s
 sanity test_271a: @@@@@@ FAIL: Unexpected 2 READ RPCs 
  Trace dump:
  = /usr/lib64/lustre/tests/test-framework.sh:5734:error()
  = /usr/lib64/lustre/tests/sanity.sh:16209:test_271a()

There are no errors in the console logs and no errors in the dmesg logs for all nodes.

Logs for the two other failures are at
https://testing.whamcloud.com/test_sets/0fb97ed2-552d-11e9-9720-52540065bddc
https://testing.whamcloud.com/test_sets/607ee376-4ea6-11e9-8e92-52540065bddc