RHEL6: EMC powerpath lost the device while the storage fault test.

Issue

• EMC powerpath lost the device while the storage fault test.

  kernel: INFO: task scsi_wq_1:662 blocked for more than 120 seconds.
  kernel:      Tainted: P           ---------------    2.6.32-431.el6.x86_64 #1
  kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  kernel: scsi_wq_1     D 0000000000000000     0   662      2 0x00000000
  kernel: ffff880474cff810 0000000000000046 ffff880479a4c078 000000000378c1c9
  kernel: ffff880479a4c040 000000000000001a ffff880474cff7c0 ffffffff81068ff5
  kernel: ffff880476775ab8 ffff880474cfffd8 000000000000fbc8 ffff880476775ab8
  kernel: Call Trace:
  kernel: [<ffffffff81068ff5>] ? enqueue_entity+0x125/0x450
  kernel: [<ffffffff8109b5ce>] ? prepare_to_wait+0x4e/0x80
  kernel: [<ffffffff810a39a5>] async_synchronize_cookie_domain+0xb5/0x150
  kernel: [<ffffffff8109b2a0>] ? autoremove_wake_function+0x0/0x40
  kernel: [<ffffffff810a3b72>] async_synchronize_full+0x62/0x80
  kernel: [<ffffffffa025eaaf>] emcp_async_synchronize+0xf/0x20 [emcp]
  kernel: [<ffffffffa0277e09>] emcp_add+0x99/0x7b0 [emcp]
  kernel: [<ffffffff81054839>] ? __wake_up_common+0x59/0x90
  kernel: [<ffffffffa027a815>] emcp_chg_device_notify+0x55/0x90 [emcp]
  kernel: [<ffffffff8152d515>] notifier_call_chain+0x55/0x80
  kernel: [<ffffffff810a17ea>] __blocking_notifier_call_chain+0x5a/0x80
  kernel: [<ffffffff810a1826>] blocking_notifier_call_chain+0x16/0x20
  kernel: [<ffffffff8136d78c>] driver_bound+0x4c/0xd0
  kernel: [<ffffffff8136d8bf>] driver_probe_device+0xaf/0x2a0
  kernel: [<ffffffff8136db60>] ? __device_attach+0x0/0x60
  kernel: [<ffffffff8136dbb3>] __device_attach+0x53/0x60
  kernel: [<ffffffff8136cae4>] bus_for_each_drv+0x64/0x90
  kernel: [<ffffffff8136dc94>] device_attach+0xa4/0xc0
  kernel: [<ffffffff8136c88d>] bus_probe_device+0x2d/0x50
  kernel: [<ffffffff8136ab47>] device_add+0x527/0x650
  kernel: [<ffffffff81371281>] ? attribute_container_device_trigger+0xd1/0xe0
  kernel: [<ffffffff8138edd9>] scsi_sysfs_add_sdev+0x89/0x2c0
  kernel: [<ffffffff8138c050>] scsi_probe_and_add_lun+0xde0/0xe60
  kernel: [<ffffffff8138cbac>] __scsi_scan_target+0x55c/0x750
  kernel: [<ffffffff8138d475>] scsi_scan_target+0xd5/0xf0
  kernel: [<ffffffffa005d8ad>] fc_scsi_scan_rport+0xbd/0xc0 [scsi_transport_fc]
  kernel: [<ffffffffa005d7f0>] ? fc_scsi_scan_rport+0x0/0xc0 [scsi_transport_fc]
  kernel: [<ffffffff81094d20>] worker_thread+0x170/0x2a0
  kernel: [<ffffffff8109b2a0>] ? autoremove_wake_function+0x0/0x40
  kernel: [<ffffffff81094bb0>] ? worker_thread+0x0/0x2a0
  kernel: [<ffffffff8109aef6>] kthread+0x96/0xa0
  kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
  kernel: [<ffffffff8109ae60>] ? kthread+0x0/0xa0
  kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20