[LU-5497] Many MDS service threads blocked in ldlm_completion_ast()

• Type: Bug
• Resolution: Won't Fix
• Priority: Blocker
• Affects Version/s: Lustre 2.4.2
• Labels: llnl
• Severity: 3
• Assignee: Oleg Drokin
• Reporter: Ned Bass (Inactive)

Description

Our production MDS systems occasionally get stuck with many service threads stuck in ldlm_completion_ast(). The details were described in LU-4579, but that issue was closed when the patch landed which fixed how timeouts are reported.

When this happens, client access hangs and the MDS appears completely idle.

Issue Links

• is related to: LU-4579 Timeout system horribly broken