kernel panic with RIP on mptsas scsi_mod:scsi_device_lookup

Issue

• kernel panic with RIP on mptsas scsi_mod:scsi_device_lookup

• Kernel panic with below traces

  Unable to handle kernel NULL pointer dereference at 0000000000000058 RIP:
   [<ffffffff88075135>] :scsi_mod:scsi_device_lookup+0x11/0x62
  PGD 11e9ae067 PUD 11e971067 PMD 0
  Oops: 0000 [1] SMP
  last sysfs file: /block/ram0/dev
  CPU 0
  Modules linked in: mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
  Pid: 534, comm: mpt/0 Not tainted 2.6.18-194.el5 #1
  RIP: 0010:[<ffffffff88075135>]  [<ffffffff88075135>] :scsi_mod:scsi_device_lookup+0x11/0x62
  Process mpt/0 (pid: 534, threadinfo ffff81011ebfa000, task ffff81011faaf080)
  Stack:  ffff81011e98e13d 0000000000000000 0000000000000001 ffff81011e947000arget> <property>]
   ffff81011e98e0c0 ffffffff880fd5aa 0000000000000003 0000000000000003
   0000000000000105 0000000000000000 0000000000000000 0000000000000000
  Call Trace:es optional keywords or options
   [<ffffffff880fd5aa>] :mptsas:mptsas_firmware_event_work+0x512/0xe75
   [<ffffffff80063ff8>] thread_return+0x62/0xfe is indicated)
   [<ffffffff880fd098>] :mptsas:mptsas_firmware_event_work+0x0/0xe75
   [<ffffffff8004dc37>] run_workqueue+0x94/0xe4
   [<ffffffff8004a472>] worker_thread+0x0/0x122on if this target and its properties
   [<ffffffff800a198c>] keventd_create_kthread+0x0/0xc4is property of this target
   [<ffffffff8004a562>] worker_thread+0xf0/0x122targets
   [<ffffffff8008e16d>] default_wake_function+0x0/0xeal notice
   [<ffffffff800a198c>] keventd_create_kthread+0x0/0xc4
   [<ffffffff800a198c>] keventd_create_kthread+0x0/0xc4
   [<ffffffff80032bdc>] kthread+0xfe/0x132
   [<ffffffff8005efb1>] child_rip+0xa/0x11
   [<ffffffff800a198c>] keventd_create_kthread+0x0/0xc4
   [<ffffffff8019e040>] acpi_processor_idle_simple+0x17d/0x30e
   [<ffffffff80032ade>] kthread+0x0/0x132
   [<ffffffff8005efa7>] child_rip+0x0/0x11
  load
  reset
  Code: 48 8b 7f 58 89 cb e8 c8 09 ff f7 89 d9 44 89 e2 44 89 ee 48
  RIP  [<ffffffff88075135>] :scsi_mod:scsi_device_lookup+0x11/0x62
   RSP <ffff81011ebfbcd0>
  CR2: 0000000000000058
   <6>mptbase: ioc0: RAID STATUS CHANGE for PhysDisk 1 id=3
  mptbase: ioc0:   PhysDisk is now failed, out of sync
  mptbase: ioc0: RAID STATUS CHANGE for VolumeID 0
  mptbase: ioc0:   volume is now degraded, enabled
  Kernel panic - not syncing: Fatal exception