[3131580.998178] LustreError: 997:0:(mdd_object.c:2597:mdd_swap_layouts()) unable to roll back layout swap. FIDs: [0x340017011:0xddde:0x0] and [0x340017774:0x1cc70:0x0]error: -61/-61, steps: 1
[3131581.003860] LustreError: 997:0:(mdd_object.c:2602:mdd_swap_layouts()) LBUG
[3131581.006922] Kernel panic - not syncing: LBUG
[3131581.009200] CPU: 15 PID: 997 Comm: mdt03_018 Kdump: loaded Tainted: G OE ------------ T 3.10.0-1160.21.1.el7_lustre.ddn13.x86_64 #1
[3131581.016927] Call Trace:
[3131581.018405] [<ffffffff8858305a>] dump_stack+0x19/0x1b
[3131581.020275] [<ffffffff8857c5b2>] panic+0xe8/0x21f
[3131581.021956] [<ffffffffc08f68cb>] lbug_with_loc+0x9b/0xa0 [libcfs]
[3131581.023682] [<ffffffffc159cd63>] mdd_swap_layouts+0x1b53/0x1d40 [mdd]
[3131581.025373] [<ffffffffc13fd07b>] mdt_swap_layouts+0x37b/0x9e0 [mdt]
[3131581.027178] [<ffffffffc0dc8bee>] tgt_request_handle+0xaee/0x15f0 [ptlrpc]
[3131581.028963] [<ffffffffc0da4371>] ? ptlrpc_nrs_req_get_nolock0+0xd1/0x170 [ptlrpc]
[3131581.030715] [<ffffffffc08f6bde>] ? ktime_get_real_seconds+0xe/0x10 [libcfs]
[3131581.032399] [<ffffffffc0d6f5db>] ptlrpc_server_handle_request+0x24b/0xab0 [ptlrpc]
[3131581.034170] [<ffffffffc0d6c255>] ? ptlrpc_wait_event+0xa5/0x360 [ptlrpc]
[3131581.035814] [<ffffffff87ed32c3>] ? __wake_up+0x13/0x20
[3131581.037332] [<ffffffffc0d72f44>] ptlrpc_main+0xb34/0x1470 [ptlrpc]
[3131581.038904] [<ffffffff87ed4c1e>] ? finish_task_switch+0x4e/0x1c0
[3131581.040412] [<ffffffff8858899f>] ? __schedule+0x3af/0x860
[3131581.041880] [<ffffffffc0d72410>] ? ptlrpc_register_service+0xf80/0xf80 [ptlrpc]
[3131581.043558] [<ffffffff87ec5da1>] kthread+0xd1/0xe0
[3131581.044942] [<ffffffff87ec5cd0>] ? insert_kthread_work+0x40/0x40
[3131581.046491] [<ffffffff88595ddd>] ret_from_fork_nospec_begin+0x7/0x21
[3131581.048032] [<ffffffff87ec5cd0>] ? insert_kthread_work+0x40/0x40