System crashed with error qla2x00_abort_all_cmds+0xa1/0x1a0

Issue

• System was experiencing issues in connectivity to SAN devices and got crashed with following panic messages:

  qla2xxx 0000:41:00.1: scsi(6:26:0): ADAPTER RESET ISSUED.
  qla2xxx 0000:41:00.1: Performing ISP error recovery - ha= ffff880829b0d800.
  BUG: unable to handle kernel NULL pointer dereference at (null)
  IP: [<ffffffffa01de541>] qla2x00_abort_all_cmds+0xa1/0x1a0 [qla2xxx]
  PGD 81efba067 PUD 81eeb2067 PMD 202c217067 PTE 0
  Oops: 0002 [#1] SMP 
  last sysfs file: /sys/devices/system/cpu/online
  CPU 7 
  [...]
  Call Trace:
   [<ffffffffa01e4cbe>] qla2x00_abort_isp_cleanup+0x1de/0x250 [qla2xxx]
   [<ffffffffa01eb855>] qla2x00_abort_isp+0xd5/0x700 [qla2xxx]
   [<ffffffff814ec44d>] ? printk+0x41/0x44
   [<ffffffffa01e0bb9>] qla2xxx_eh_host_reset+0x1e9/0x240 [qla2xxx]
   [<ffffffff8135d5d2>] scsi_try_host_reset+0x42/0x120
   [<ffffffff8135ef4e>] scsi_eh_ready_devs+0x58e/0x850
   [<ffffffff8135f8a3>] scsi_error_handler+0x483/0x660
   [<ffffffff8135f420>] ? scsi_error_handler+0x0/0x660
   [<ffffffff81090886>] kthread+0x96/0xa0
   [<ffffffff8100c14a>] child_rip+0xa/0x20
   [<ffffffff810907f0>] ? kthread+0x0/0xa0
   [<ffffffff8100c140>] ? child_rip+0x0/0x20
  Code: 00 00 48 8b 40 10 48 8b 48 38 81 39 04 00 00 80 0f 84 f4 00 00 00 48 8b 48 18 48 89 c7 c7 81 ec 00 00 00 00 00 00 00 48 8b 48 40 <44> 89 21 48 89 55 b8 ff 50 30 49 8b 7e 30 e8 fc 1c f8 e0 48 8b 
  RIP  [<ffffffffa01de541>] qla2x00_abort_all_cmds+0xa1/0x1a0 [qla2xxx]