System crashed when a SCSI device timedout

Issue

• System was crashed when a SCSI device has an issue and showed the below in vmcore

lpfc 0000:16:00.1: 1:(0):0203 Devloss timeout on WWPN 50:01:43:80:03:2a:80:a1 NPort x060f00 Data: x80040080 x2 x6
st 1:0:3:0: Unexpected response from lun 1 while scanning, scan aborted
BUG: unable to handle kernel NULL pointer dereference at 0000000000000300
IP: [<ffffffff8136a2a6>] scsi_run_queue+0x16/0x290
PGD 1f9fb37067 PUD 30ecc1067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:03.0/0000:16:00.1/host1/rport-1:0-8/target1:0:6/1:0:6:0/state
CPU 0 
Modules linked in: ppdev parport_pc lp parport mptctl mptbase ipmi_si ipmi_devintf ipmi_msghandler bridge fuse autofs4 sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bonding 8021q garp stp llc ipv6 vfat fat dm_round_robin scsi_dh_emc dm_multipath microcode cdc_ether usbnet mii i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support shpchp ioatdma dca ch osst st sg be2net ext4 mbcache jbd2 sd_mod crc_t10dif mpt2sas scsi_transport_sas raid_class wmi lpfc scsi_transport_fc scsi_tgt dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]

Pid: 82, comm: kblockd/0 Not tainted 2.6.32-279.el6.x86_64
RIP: 0010:[<ffffffff8136a2a6>]  [<ffffffff8136a2a6>] scsi_run_queue+0x16/0x290
RSP: 0018:ffff882032e57dc0  EFLAGS: 00010286
RAX: ffff881f937bbdb0 RBX: ffff880028219840 RCX: ffff880028219848
RDX: ffff881f937bbda8 RSI: ffff880028219848 RDI: 0000000000000000
RBP: ffff882032e57e20 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880028219840
R13: ffffffff8136a520 R14: ffff882032e57fd8 R15: ffff880028219848
FS:  0000000000000000(0000) GS:ffff880028200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000300 CR3: 000000202e869000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process kblockd/0 (pid: 82, threadinfo ffff882032e56000, task ffff882032dceae0)
Stack:
 000000000000fb88 ffff882032dcf098 ffffffff81a8d020 ffff882032dceae0
<d> 0000000000000001 0000000000000000 ffff882032e57e30 ffff880028219840
<d> ffff880028219840 ffffffff8136a520 ffff882032e57fd8 ffff880028219848
Call Trace:
 [<ffffffff8136a520>] ? scsi_requeue_run_queue+0x0/0x20
 [<ffffffff8136a535>] scsi_requeue_run_queue+0x15/0x20
 [<ffffffff8108c760>] worker_thread+0x170/0x2a0
 [<ffffffff810920d0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff8108c5f0>] ? worker_thread+0x0/0x2a0
 [<ffffffff81091d66>] kthread+0x96/0xa0
 [<ffffffff8100c14a>] child_rip+0xa/0x20
 [<ffffffff81091cd0>] ? kthread+0x0/0xa0
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
Code: 83 c4 08 5b c9 c3 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 38 0f 1f 44 00 00 <4c> 8b b7 00 03 00 00 49 89 fd 4d 85 f6 0f 84 5e 02 00 00 4c 8d 
RIP  [<ffffffff8136a2a6>] scsi_run_queue+0x16/0x290
 RSP <ffff882032e57dc0>
CR2: 0000000000000300