[LU-6989] ldlm_lib.c:1831:check_for_next_transno system restarts unexpectedly

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Critical
• Environment: https://build.hpdd.intel.com/job/lustre-master/3133/arch=x86_64,build_type=server,distro=el6.6,ib_stack=inkernel/
• Severity: 3
• Assignee: WC Triage
• Reporter: Alex

Description

During an active file deletion, an error occurs, after which the system restarts unexpectedly.
Logs
Aug 12 16:14:42 hard kernel: LustreError: 2954:0:(ldlm_lib.c:1831:check_for_next_transno()) FS-MDT0000: waking for gap in transno, VBR is OFF (skip: 115964304784, ql: 1, comp: 2, conn: 3, next: 115964304785, next_update 0 last_committed: 115964304265)
Aug 12 16:14:42 hard kernel: LustreError: 2954:0:(ldlm_lib.c:1831:check_for_next_transno()) FS-MDT0000: waking for gap in transno, VBR is OFF (skip: 115964304793, ql: 1, comp: 2, conn: 3, next: 115964304794, next_update 0 last_committed: 115964304265)
Aug 12 16:14:42 hard kernel: LustreError: 2954:0:(ldlm_lib.c:1831:check_for_next_transno()) FS-MDT0000: waking for gap in transno, VBR is OFF (skip: 115964304795, ql: 1, comp: 2, conn: 3, next: 115964304796, next_update 0 last_committed: 115964304265)
Aug 12 16:14:42 hard kernel: LustreError: 2954:0:(ldlm_lib.c:1831:check_for_next_transno()) FS-MDT0000: waking for gap in transno, VBR is OFF (skip: 115964304807, ql: 1, comp: 2, conn: 3, next: 115964304808, next_update 0 last_committed: 115964304265)
Aug 12 16:14:42 hard kernel: LustreError: 2954:0:(ldlm_lib.c:1831:check_for_next_transno()) FS-MDT0000: waking for gap in transno, VBR is OFF (skip: 115964304809, ql: 1, comp: 2, conn: 3, next: 115964304810, next_update 0 last_committed: 115964304265)
Aug 12 16:14:42 hard kernel: Lustre: FS-MDT0000: disconnecting 1 stale clients
Aug 12 16:14:43 hard kernel: Lustre: FS-MDT0000: Recovery over after 0:36, of 3 clients 2 recovered and 1 was evicted.
Aug 12 16:14:43 hard kernel: Lustre: FS-OST0000: deleting orphan objects from 0x0:1292643 to 0x0:1292823