[LU-6819] LBUG ASSERTION( tdtd->tdtd_last_update_transno <= transno ) failed

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.8.0
• Environment: Lola - 2.7.56 tag
• Severity: 3
• Assignee: Di Wang
• Reporter: Cliff White (Inactive)

Description

After several MDT failovers (ldiskfs format) the MDT is failing to mount. Mount produces this LBUG:

Jul  8 15:55:53 lola-11 kernel: LustreError: 38479:0:(ldlm_lib.c:2313:replay_request_or_update()) ASSERTION( tdtd->tdtd_last_update_transno <= transno ) failed:
Jul  8 15:55:53 lola-11 kernel: LustreError: 38479:0:(ldlm_lib.c:2313:replay_request_or_update()) LBUG

Unfortunately panic_on_lbug was set. Will attempt to reproduce and get stack
So far we have

Call Trace:^M
 [<ffffffffa0741875>] libcfs_debug_dumpstack+0x55/0x80 [libcfs]^M
 [<ffffffffa0741e77>] lbug_with_loc+0x47/0xb0 [libcfs]^M
 [<ffffffffa0a909e7>] target_recovery_thread+0x2147/0x2720 [ptlrpc]^M
 [<ffffffff8152a2be>] ? thread_return+0x4e/0x7d0^M
 [<ffffffffa0a8e8a0>] ? target_recovery_thread+0x0/0x2720 [ptlrpc]^M
 [<ffffffff8109e78e>] kthread+0x9e/0xc0^M
 [<ffffffff8100c28a>] child_rip+0xa/0x20^M
 [<ffffffff8109e6f0>] ? kthread+0x0/0xc0^M
 [<ffffffff8100c280>] ? child_rip+0x0/0x20^M

Issue Links

• is related to: LU-6831 The ticket for tracking all DNE2 bugs