RHEL 7.1: System panic at qla2x00_status_entry+977

Issue

• Host running 480 FC NPIV initiators crashed when disabling target port. There were following errors observed on console at the time of crash:

  qla2xxx [0000:04:00.0]-2858:35: GID_PT entry - nn 21000024ff5bb0b8 pn 20410024ff5bb0b8 portid=c81b2a.
  qla2xxx [0000:04:00.0]-3821:367: Port to be marked lost on fcport=c82b00, current port state= ONLINE.
  qla2xxx [0000:04:00.0]-287d:367: FCPort state transitioned from ONLINE to LOST - portid=c82b00.
  qla2xxx [0000:04:00.0]-2867:367: Port login retry 5742b0f0000bc014, id = 0x0177 retry cnt=45.
  BUG: unable to handle kernel NULL pointer dereference at 0000000000000084
  IP: [<ffffffffa024b991>] qla2x00_status_entry+0x3d1/0x1150 [qla2xxx]
  PGD 0 
  Oops: 0000 [#1] SMP 
  [...]
  CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.0-123.13.2.el7.bz1191025.x86_64 #1
  Hardware name:    /01W23F, BIOS 2.4.3 07/09/2014
  task: ffffffff818d7440 ti: ffffffff818c4000 task.ti: ffffffff818c4000
  RIP: 0010:[<ffffffffa024b991>]  [<ffffffffa024b991>] qla2x00_status_entry+0x3d1/0x1150 [qla2xxx]
  RSP: 0018:ffff88042fa03ce0  EFLAGS: 00010046
  RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffa0293740
  RDX: 00000000000000c8 RSI: ffff8800b25b9740 RDI: 0000000008000000
  RBP: ffff88042fa03de0 R08: 0000000000000029 R09: 0000000000000000
  R10: ffff8803aa45b840 R11: ffff88034e2956c0 R12: ffff880426274000
  R13: ffff880428e04740 R14: 0000000000000029 R15: 00000000000e0000
  FS:  0000000000000000(0000) GS:ffff88042fa00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000084 CR3: 00000000018d0000 CR4: 00000000001407f0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Stack:
   ffff880400000000 ffffffffa029e5ec ffff880428045b00 ffff88042fa135c0
   ffff8804000000c8 ffff88040000002b ffffffff00000000 0000000000000000
   ffff8803a1e2b298 ffff880400000000 ffffffff00000000 ffff880400000000
  Call Trace:
   <IRQ> 
  
   [<ffffffffa024d49e>] qla24xx_process_response_queue+0x32e/0x5c0 [qla2xxx]
   [<ffffffff8107c160>] ? __queue_work+0x320/0x320
   [<ffffffff8107c178>] ? delayed_work_timer_fn+0x18/0x20
   [<ffffffff8106d236>] ? call_timer_fn+0x36/0x110
   [<ffffffffa024f5bb>] qla24xx_msix_rsp_q+0x4b/0xc0 [qla2xxx]
   [<ffffffff810f732e>] handle_irq_event_percpu+0x3e/0x1e0
   [<ffffffff810f750d>] handle_irq_event+0x3d/0x60
   [<ffffffff810fa197>] handle_edge_irq+0x77/0x130
   [<ffffffff81014c0f>] handle_irq+0xbf/0x150
   [<ffffffff815ee08a>] ? atomic_notifier_call_chain+0x1a/0x20
   [<ffffffff815f4c4f>] do_IRQ+0x4f/0xf0
   [<ffffffff815e9dad>] common_interrupt+0x6d/0x6d
   <EOI> 
  
   [<ffffffff814835a2>] ? cpuidle_enter_state+0x52/0xc0
   [<ffffffff814836d5>] cpuidle_idle_call+0xc5/0x200
   [<ffffffff8101bc7e>] arch_cpu_idle+0xe/0x30
   [<ffffffff810b47e5>] cpu_startup_entry+0xf5/0x290
   [<ffffffff815c3d57>] rest_init+0x77/0x80
   [<ffffffff81a07fa7>] start_kernel+0x429/0x44a
   [<ffffffff81a07987>] ? repair_env_string+0x5c/0x5c
   [<ffffffff81a07120>] ? early_idt_handlers+0x120/0x120
   [<ffffffff81a075ee>] x86_64_start_reservations+0x2a/0x2c
   [<ffffffff81a07742>] x86_64_start_kernel+0x152/0x175
  Code: 00 48 89 54 24 40 0f b7 55 c2 89 54 24 38 0f b6 57 28 89 54 24 30 0f b6 57 29 89 54 24 28 0f b6 57 2a bf 00 00 00 08 89 54 24 20 <8b> 90 84 00 00 00 89 54 24 18 8b 80 80 00 00 00 ba 22 30 00 00 
  RIP  [<ffffffffa024b991>] qla2x00_status_entry+0x3d1/0x1150 [qla2xxx]
  RSP <ffff88042fa03ce0>
  CR2: 0000000000000084