System crash in lpfc_nlp_get() following port state transitions

Issue

• System crash in lpfc_nlp_get() following port state transitions:

[3083613.576786] lpfc 0000:37:00.3: 209: [3083613.570333] 1:(0):0211 DSM in event xb on NPort x1e01e2 in state 5 rpi xffff Data: x20100 x10008
[3083613.586921] lpfc 0000:37:00.3: 210: [3083613.570362] 1:(0):2819 Abort outstanding I/O on NPort x1e01e2 Data: x20100 x5 xffff
[3083613.596407] lpfc 0000:37:00.3: 211: [3083613.570391] 1:(0):0339 Abort xri x89e, original iotag x71f, abort cmd iotag x71d retval x0
[3083613.608786] lpfc 0000:37:00.3: 212: [3083613.570408] 1:0357 ELS CQE error: status=x3: CQE: 071d0300 00000000 00000005 80010000
[3083613.618418] lpfc 0000:37:00.3: 213: [3083613.570420] 1:(0):0904 NPort state transition x1e01e2, LOGO -> UNUSED
[3083613.625127] lpfc 0000:37:00.3: 214: [3083613.570422] 1:(0):0212 DSM out state 255 on NPort x1e01e2 rpi xffff Data: x10100 x10008
[3083613.635157] lpfc 0000:37:00.3: 215: [3083613.570482] 1:(0):0105 LOGO completes to NPort x1e01e2 refcnt 1 nflags x10000 Data: x3 x103 xa x0
[3083613.647996] lpfc 0000:37:00.3: 1:(0):2756 LOGO failure, No Retry DID:1E01E2 Status:x3/x103
[3083613.654509] BUG: unable to handle kernel NULL pointer dereference at 0000000000000344
[3083613.658208] PGD 0 P4D 0 
[3083613.664242] Oops: 0000 [#1] SMP PTI
[3083613.670852] CPU: 31 PID: 1220 Comm: lpfc_worker_1 Kdump: loaded Tainted: G          I      --------- -  - 4.18.0-348.2.1.el8_5.x86_64 #1
[3083613.681491] Hardware name: HPE ProLiant BL460c Gen10/ProLiant BL460c Gen10, BIOS I41 05/21/2019
[3083613.687226] RIP: 0010:lpfc_nlp_get+0xca/0x170 [lpfc]
[3083613.693696] Code: c0 41 08 c0 74 c7 e9 cb d2 05 00 eb d0 80 3d 81 38 0b 00 00 74 52 31 c0 5b 5d c3 48 89 ef e8 0d f4 18 ec 48 8b 83 18 01 00 00 <8b> 90 44 03 00 00 f6 c2 80 75 53 85 d2 75 dd 48 8b 38 8b b3 98 01
[3083613.705231] RSP: 0018:ffffabcb5af4fd70 EFLAGS: 00010246
[3083613.709860] RAX: 0000000000000000 RBX: ffff8f248ad86200 RCX: 00000000001e01e2
[3083613.715797] RDX: 0000000000000000 RSI: 0000000000000246 RDI: 0000000000000246
[3083613.721872] RBP: ffff8f248ad86290 R08: 0000000000000000 R09: 0000000000000000
[3083613.727966] R10: ffff8f248ad86200 R11: 0000000000000001 R12: ffff8f24a227bc00
[3083613.731018] R13: 000000000000000b R14: ffff8f29206e17b8 R15: ffff8f24a227bc00
....
[3083613.764268] PKRU: 55555554
[3083613.770098] Call Trace:
[3083613.775134]  lpfc_disc_state_machine+0x23/0x2d0 [lpfc]
[3083613.778720]  lpfc_sli_sp_handle_rspiocb+0x6b9/0x800 [lpfc]
[3083613.784279]  lpfc_sli_handle_slow_ring_event_s4+0x195/0x280 [lpfc]
[3083613.789914]  lpfc_do_work+0x972/0x1850 [lpfc]
[3083613.795187]  ? finish_wait+0x80/0x80
[3083613.798893]  ? lpfc_unregister_unused_fcf+0x80/0x80 [lpfc]
....