[LU-1122] MDS got LBUG after upgrade from 1.8.7-RHEL5 to 2.1.55-RHEL6 and then downgrade to 2.1.0-RHEL6

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.2.0
• Fix Version/s: Lustre 2.2.0
• Type: Bug
• Priority: Blocker
• Reporter: Sarah Liu
• Assignee: Zhenyu Xu
• Resolution: Fixed
• Severity: 3

Description

Before upgrade,the system configuration is one MDS(1.8.7-RHEL5), two OSS(1.8.7-RHEL5 and 2.1.0-RHEL6) and two clients(1.8.7-RHEL5 and 1.8.7-RHEL6), then upgrade servers and clients to 2.1.55-RHEL6, check the system, works fine. Then do the downgrade, MDS downgrade to 2.1.0-RHEL6, OSS downgrade to 1.8.7-RHEL5 and 2.1.0-RHEL6, clients downgrade to 2.1.0-RHEL5 and 2.1.0-RHEL6

Got LBUG when checking the dir/files in the OST pool. MDS console log please see the attached.

Comments

[Peter Jones]

Bobi

Could you please look at this one?

Thanks

Peter

[Zhenyu Xu]

Lustre: DEBUG MARKER: ===== Check the directories/files in the OST pool
LustreError: 8113:0:(mdd_object.c:94:mdd_la_get()) ASSERTION(mdd_object_exists(obj)) failed: FID is [0x200000bd0:0x1:0x0]
LustreError: 8113:0:(mdd_object.c:94:mdd_la_get()) LBUG

It's 2.1.0 known bug, and needs http://review.whamcloud.com/#change,1928 + http://review.whamcloud.com/#change,2148 to fix it.