[LU-10039] ioctl error after downgrade

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Affects Version/s: Lustre 2.10.0, Lustre 2.10.1
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Andreas Dilger

Description

Took following steps to reproduce the issue and the issue was not reproduced.
Steps for both zfs and ldiskfs:
1. Clients and Servers with b_ieel3_0 build 222. Created Lustre file system.
2. Unmounted and upgraded all clients and Servers to 2.10.1. Mounted lustre again.
3. Unmounted Clients and Downgraded them to b_ieel3_0 build 222. Mounted Lustre again when nodes were up.
4. Unmounted MDS and downgraded it to b_ieel3_0 build 222. Mounted lustre and it worked this time.
5. Ran sanity now and the test ended abruptly after the completion of test_117 for both zfs and ldiskfs.

When I checked the states of nodes, MDT and one client were unmounted, OSTs and 2nd client were mounted.

Results:
ldiskfs - https://testing.hpdd.intel.com/test_sessions/df43fbf4-a2fb-11e7-b786-5254006e85c2
zfs - https://testing.hpdd.intel.com/test_sessions/335a5516-a2fd-11e7-bb19-5254006e85c2

Issue Links

• is related to: LU-10027 Unable to finish mount on MDS while Rolling downgrade