system crashed at _spin_lock+0xe after showing 'ata2' timeout error messages

Issue

• VMWare virtual machine was crashed with the below error messages

ata2.00: qc timeout (cmd 0xa0)
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
sr 1:0:0:0: CDB: Test Unit Ready: 00 00 00 00 00 00
ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
         res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
ata2.00: status: { DRDY ERR }
ata2: soft resetting link
ata2.00: configured for UDMA/33
ata2: EH complete
ata2.00: qc timeout (cmd 0xa0)
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
sr 1:0:0:0: CDB: Test Unit Ready: 00 00 00 00 00 00
ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
         res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
ata2.00: status: { DRDY ERR }
ata2: soft resetting link
ata2.00: configured for UDMA/33
ata2: EH complete

...

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff8150010e>] _spin_lock+0xe/0x30
PGD 238d9c067 PUD 238d9d067 PMD 0 
Oops: 0002 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:15.0/0000:03:00.0/local_cpus
CPU 0 
Modules linked in: bridge stp llc fuse autofs4 sunrpc cachefiles fscache(T) ipv6 vsock(U) uinput ppdev parport_pc parport e1000 vmware_balloon microcode sg vmci(U) i2c_piix4 i2c_core shpchp ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom vmw_pvscsi pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: speedstep_lib]

Pid: 2710, comm: udisks-daemon Tainted: G           ---------------  T 2.6.32-279.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffff8150010e>]  [<ffffffff8150010e>] _spin_lock+0xe/0x30
RSP: 0018:ffff880238d9b748  EFLAGS: 00010082
RAX: 0000000000010000 RBX: ffff880235f1d000 RCX: 0000000000000000
RDX: 00000000000ceec9 RSI: ffffffff81363180 RDI: 0000000000000000
RBP: ffff880238d9b748 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880234d8d480
R13: ffff880234e1f000 R14: ffffc900097e0000 R15: ffffffff81363180
FS:  00007f0c644507a0(0000) GS:ffff88002f600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000238d99000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process udisks-daemon (pid: 2710, threadinfo ffff880238d9a000, task ffff88023735e040)
Stack:
 ffff880238d9b788 ffffffff813814d7 ffff880234d8d480 ffff880234d8d480
<d> ffff880234d7a000 0000000000000000 0000000000000206 ffff880234d8d480
<d> ffff880238d9b7b8 ffffffff81363411 ffff880234d45800 ffff880234df0e60
Call Trace:
 [<ffffffff813814d7>] ata_scsi_queuecmd+0x47/0x2d0
 [<ffffffff81363411>] scsi_dispatch_cmd+0x101/0x360
 [<ffffffff8136af0d>] scsi_request_fn+0x41d/0x790
 [<ffffffff8107e0bd>] ? del_timer+0x7d/0xe0
 [<ffffffff8124f754>] ? elv_insert+0x154/0x1a0
 [<ffffffff8125c6c0>] ? blk_end_sync_rq+0x0/0x40
 [<ffffffff81255662>] __generic_unplug_device+0x32/0x40
 [<ffffffff8125c78e>] blk_execute_rq_nowait+0x8e/0x120
 [<ffffffff8125c8a4>] blk_execute_rq+0x84/0xf0
 [<ffffffff810629d3>] ? dequeue_entity+0x113/0x2e0
 [<ffffffff81258c66>] ? blk_get_request+0x46/0xa0
 [<ffffffff8136c898>] scsi_execute+0xe8/0x180
 [<ffffffff8136cb28>] scsi_execute_req+0xb8/0x190
 [<ffffffffa001b2eb>] sr_test_unit_ready+0x6b/0xf0 [sr_mod]
 [<ffffffff81162f55>] ? kmem_cache_alloc_notrace+0x115/0x130
 [<ffffffffa001c2bb>] sr_media_change+0xab/0x350 [sr_mod]
 [<ffffffff8109248c>] ? remove_wait_queue+0x3c/0x50
 [<ffffffff8118fd26>] ? free_poll_entry+0x26/0x30
 [<ffffffffa005f0b0>] media_changed+0x70/0xc0 [cdrom]
 [<ffffffffa005f137>] cdrom_media_changed+0x37/0x40 [cdrom]
 [<ffffffffa001b3d9>] sr_block_media_changed+0x19/0x20 [sr_mod]
 [<ffffffff811b3b93>] check_disk_change+0x33/0x80
 [<ffffffffa0062308>] cdrom_open+0x248/0x600 [cdrom]
 [<ffffffff812741ea>] ? kobject_get+0x1a/0x30
 [<ffffffff8125f25d>] ? get_disk+0x7d/0xf0
 [<ffffffff81193627>] ? __d_lookup+0xa7/0x150
 [<ffffffff812741ea>] ? kobject_get+0x1a/0x30
 [<ffffffffa001b599>] sr_block_open+0x79/0xd0 [sr_mod]
 [<ffffffff8134bad9>] ? get_device+0x19/0x20
 [<ffffffff811b49b3>] __blkdev_get+0xc3/0x3c0
 [<ffffffff811b4cd0>] ? blkdev_open+0x0/0xc0
 [<ffffffff811b4cc0>] blkdev_get+0x10/0x20
 [<ffffffff811b4d41>] blkdev_open+0x71/0xc0
 [<ffffffff8117888a>] __dentry_open+0x10a/0x360
 [<ffffffff8121429f>] ? security_inode_permission+0x1f/0x30
 [<ffffffff81178bf4>] nameidata_to_filp+0x54/0x70
 [<ffffffff8118c100>] do_filp_open+0x6c0/0xd60
 [<ffffffff810602a5>] ? wake_up_process+0x15/0x20
 [<ffffffff8119a330>] ? mntput_no_expire+0x30/0x110
 [<ffffffff81198182>] ? alloc_fd+0x92/0x160
 [<ffffffff81178639>] do_sys_open+0x69/0x140
 [<ffffffff8100c5b5>] ? math_state_restore+0x45/0x60
 [<ffffffff81178750>] sys_open+0x20/0x30
 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
Code: e5 0f 1f 44 00 00 fa 66 0f 1f 44 00 00 f0 81 2f 00 00 00 01 74 05 e8 e2 e3 d7 ff c9 c3 55 48 89 e5 0f 1f 44 00 00 b8 00 00 01 00 <f0> 0f c1 07 0f b7 d0 c1 e8 10 39 c2 74 0e f3 90 0f 1f 44 00 00 
RIP  [<ffffffff8150010e>] _spin_lock+0xe/0x30
 RSP <ffff880238d9b748>
CR2: 0000000000000000