[LU-1602] Fix flock deadlock detection race

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.4.1, Lustre 2.5.0
• Labels: patch
• Severity: 3
• Assignee: Keith Mannthey (Inactive)
• Reporter: Andriy Skulysh

Description

if 2 threads are trying to grant 2 locks which deadlock to each other and are running ldlm_flock_deadlock() in parallel, deadlock may not detected.