[LU-8043] MDS running lustre 2.5.5+ OOM when running with Lustre 2.8 GA clients

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Critical
• Fix Version/s: Lustre 2.5.5
• Affects Version/s: Lustre 2.5.5
• Environment: Cray clients running unpatched lustre 2.8 GA clients. Server side running Lustre 2.5.5 with a patch set in a RHEL6.7 environment.
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: James A Simmons

Description

Today we performed a test shot on our smaller Cray Aries cluster (700 nodes) with a non-patched lustre 2.8 GA client specially build for this system. The test were run against our atlas file system which is running a RHEL6.7 distro with the lustre version 2.5.5 with patches. During our test shot while running an IOR single shared file test across all nodes with the stripe count of 1008 the MDS server ran out of memory. I attached the dmesg output to this ticket.

Issue Links

• is related to: LU-7535 mdt_intent_layout does not care about lock handles
• is related to: LU-5367 (mdt_handler.c:2782:mdt_lock_handle_fini()) ASSERTION( !lustre_handle_is_used(&lh->mlh_pdo_lh) ) failed