System crash in lpfc_sli4_bpl2sgl()

Issue

• System crash in lpfc_sli4_bpl2sgl():

[6964981.571260] BUG: unable to handle kernel NULL pointer dereference at           (null)
[6964981.571265] IP: [<ffffffffc062dbcd>] lpfc_sli4_bpl2sgl.isra.12.part.13+0xbd/0x160 [lpfc]
[6964981.571279] PGD 0 
[6964981.571281] Oops: 0002 [#1] SMP 
....
[6964981.571330] CPU: 89 PID: 1378 Comm: lpfc_worker_0 Kdump: loaded Tainted: P        W  OE  ------------ T 3.10.0-862.el7.x86_64 #1
[6964981.571332] Hardware name: HPE ProLiant DL560 Gen10/ProLiant DL560 Gen10, BIOS U34 06/20/2018
[6964981.571333] task: ffff920b7a040000 ti: ffff920b7a048000 task.ti: ffff920b7a048000
[6964981.571335] RIP: 0010:[<ffffffffc062dbcd>]  [<ffffffffc062dbcd>] lpfc_sli4_bpl2sgl.isra.12.part.13+0xbd/0x160 [lpfc]
[6964981.571340] RSP: 0018:ffff920b7a04bae0  EFLAGS: 00010046
....
[6964981.571354] Call Trace:
[6964981.571361]  [<ffffffffc062e430>] __lpfc_sli_issue_iocb_s4+0x110/0x1f0 [lpfc]
[6964981.571370]  [<ffffffffc065ca95>] ? lpfc_nlp_get+0xb5/0x140 [lpfc]
[6964981.571378]  [<ffffffffc064c81d>] ? lpfc_prep_els_iocb+0x22d/0x590 [lpfc]
[6964981.571385]  [<ffffffffc0635335>] lpfc_sli_issue_iocb+0xa5/0x180 [lpfc]
[6964981.571391]  [<ffffffffc0650b64>] lpfc_els_rdp_cmpl+0x814/0xa70 [lpfc]
[6964981.571399]  [<ffffffffc067b7fc>] ? lpfc_sli4_mbox_cmd_free+0xfc/0x150 [lpfc]
[6964981.571406]  [<ffffffffc067bb95>] lpfc_mbx_cmpl_rdp_link_stat+0xa5/0xb0 [lpfc]
[6964981.571412]  [<ffffffffc063277e>] lpfc_sli_handle_mb_event+0x16e/0x4b0 [lpfc]
[6964981.571416]  [<ffffffff812d816c>] ? update_curr+0x14c/0x1e0
[6964981.571418]  [<ffffffff812d4ade>] ? account_entity_dequeue+0xae/0xd0
[6964981.571420]  [<ffffffff812d865c>] ? dequeue_entity+0x11c/0x5e0
[6964981.571423]  [<ffffffff812a445d>] ? mod_timer+0x14d/0x230
[6964981.571429]  [<ffffffffc0634ec5>] ? lpfc_sli4_post_async_mbox+0x2b5/0x3f0 [lpfc]
[6964981.571430]  [<ffffffff812d1f75>] ? sched_clock_cpu+0x85/0xc0
[6964981.571437]  [<ffffffffc0662e10>] lpfc_work_done+0xa20/0x14c0 [lpfc]
[6964981.571440]  [<ffffffff8191291c>] ? __schedule+0x41c/0xa20
[6964981.571446]  [<ffffffffc0663920>] lpfc_do_work+0x70/0x1e0 [lpfc]
[6964981.571448]  [<ffffffff812bbe20>] ? wake_up_atomic_t+0x30/0x30
[6964981.571454]  [<ffffffffc06638b0>] ? lpfc_work_done+0x14c0/0x14c0 [lpfc]
[6964981.571457]  [<ffffffff812bae31>] kthread+0xd1/0xe0
[6964981.571460]  [<ffffffff812bad60>] ? insert_kthread_work+0x40/0x40
[6964981.571463]  [<ffffffff8191f61d>] ret_from_fork_nospec_begin+0x7/0x21
[6964981.571465]  [<ffffffff812bad60>] ? insert_kthread_work+0x40/0x40
....
[6964981.571486] RIP  [<ffffffffc062dbcd>] lpfc_sli4_bpl2sgl.isra.12.part.13+0xbd/0x160 [lpfc]
[6964981.571490]  RSP <ffff920b7a04bae0>
[6964981.571491] CR2: 0000000000000000