Issue

• A system with Emulex HBAs crashed with hard LOCKUP errors:

  sd 1:0:2:16: [sdad] tag#385 FAILED Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
  sd 1:0:2:16: [sdad] tag#385 CDB: Test Unit Ready 00 00 00 00 00 00
  sd 1:0:2:17: [sdaf] tag#386 FAILED Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
  sd 1:0:2:17: [sdaf] tag#386 CDB: Test Unit Ready 00 00 00 00 00 00
  [...]
  lpfc 0000:09:00.0: 0:2885 Port Status Event: port status reg 0x81800000, port smphr reg 0xc000, error 1=0x52004a02, error 2=0x0
  lpfc 0000:09:00.0: 0:2887 Reset Needed: Attempting Port Recovery...
  [...]
  NMI watchdog: Watchdog detected hard LOCKUP on cpu 21
  [...]
   CPU: 21 PID: 726 Comm: lpfc_worker_1 Kdump: loaded Tainted: P        W  OE  ------------ T 3.10.0-862.3.2.el7.x86_64 #1
   Hardware name: HP ProLiant BL460c Gen9, BIOS I36 10/25/2017
   Call Trace:
    <NMI>  [<ffffffff8270e78e>] dump_stack+0x19/0x1b
    [<ffffffff8213fd85>] watchdog_overflow_callback+0x135/0x140
    [<ffffffff8217f8b7>] __perf_event_overflow+0x57/0x100
    [<ffffffff821882a4>] perf_event_overflow+0x14/0x20
    [<ffffffff8200a580>] intel_pmu_handle_irq+0x220/0x510
    [<ffffffff8234cbb4>] ? ioremap_page_range+0x2b4/0x450
    [<ffffffff821d6c84>] ? vunmap_page_range+0x234/0x470
    [<ffffffff8240a946>] ? ghes_copy_tofrom_phys+0x116/0x210
    [<ffffffff8240aae0>] ? ghes_read_estatus+0xa0/0x190
    [<ffffffff82717031>] perf_event_nmi_handler+0x31/0x50
    [<ffffffff8271893c>] nmi_handle.isra.0+0x8c/0x150
    [<ffffffff82718c18>] do_nmi+0x218/0x460
    [<ffffffff82717dd3>] end_repeat_nmi+0x1e/0x81
    [<ffffffffc0cd4636>] ? lpfc_hba_clean_txcmplq+0x176/0x1f0 [lpfc]  <<----------
    [<ffffffffc0cd4636>] ? lpfc_hba_clean_txcmplq+0x176/0x1f0 [lpfc]  <<----------
    [<ffffffffc0cd4636>] ? lpfc_hba_clean_txcmplq+0x176/0x1f0 [lpfc]  <<----------
    <EOE>  [<ffffffffc0cd4c21>] lpfc_hba_down_post_s4+0x61/0x490 [lpfc]
    [<ffffffffc0cd5af2>] lpfc_hba_down_post+0x12/0x20 [lpfc]
    [<ffffffffc0c9fb61>] lpfc_sli_brdrestart_s4+0xe1/0x150 [lpfc]
    [<ffffffffc0c9fbe2>] lpfc_sli_brdrestart+0x12/0x20 [lpfc]
    [<ffffffffc0cda9d8>] lpfc_sli4_port_sta_fn_reset.constprop.36+0x48/0x150 [lpfc]
    [<ffffffffc0cdabde>] lpfc_handle_eratt_s4+0xfe/0x5a0 [lpfc]
    [<ffffffffc0cd6145>] lpfc_handle_eratt+0x15/0x20 [lpfc]
    [<ffffffffc0ccf5d0>] lpfc_work_done+0x11e0/0x14c0 [lpfc]
    [<ffffffff8271394c>] ? __schedule+0x41c/0xa20
    [<ffffffffc0ccf920>] lpfc_do_work+0x70/0x1e0 [lpfc]
    [<ffffffff820bc150>] ? wake_up_atomic_t+0x30/0x30
    [<ffffffffc0ccf8b0>] ? lpfc_work_done+0x14c0/0x14c0 [lpfc]
    [<ffffffff820bb161>] kthread+0xd1/0xe0
    [<ffffffff820bb090>] ? insert_kthread_work+0x40/0x40
    [<ffffffff82720677>] ret_from_fork_nospec_begin+0x21/0x21
    [<ffffffff820bb090>] ? insert_kthread_work+0x40/0x40
   Kernel panic - not syncing: Hard LOCKUP
  [...]