System in hang state by blocked 'khelper' processes

Issue

• System is suffereing with lots of blocked processes.

INFO: task khelper:14 blocked for more than 120 seconds.
      Tainted: G           ---------------  T 2.6.32-504.1.3.el6.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
khelper       D 0000000000000000     0    14      2 0x00000000
 ffff88023cf49b50 0000000000000046 0000000000000000 ffff8800000685c0
 0000000000000286 0000000000000000 0000000000000002 ffff880000079340
 ffff88023cf47540 00000000000000d0 ffff88023cf47af8 ffff88023cf49fd8
Call Trace:
 [<ffffffff8152a8e5>] schedule_timeout+0x215/0x2e0
 [<ffffffff8106d175>] ? enqueue_entity+0x125/0x450
 [<ffffffff8152a563>] wait_for_common+0x123/0x180
 [<ffffffff81064b90>] ? default_wake_function+0x0/0x20
 [<ffffffff8152a67d>] wait_for_completion+0x1d/0x20
 [<ffffffff81073f19>] do_fork+0x1d9/0x480
 [<ffffffff81096f20>] ? __call_usermodehelper+0x0/0xd0
 [<ffffffff8100c1a2>] kernel_thread+0x82/0xe0
 [<ffffffff81096f20>] ? __call_usermodehelper+0x0/0xd0
 [<ffffffff81096ac0>] ? ____call_usermodehelper+0x0/0x140
 [<ffffffff8100c200>] ? child_rip+0x0/0x20
 [<ffffffff81096f66>] ? __call_usermodehelper+0x46/0xd0
 [<ffffffff81097fe0>] worker_thread+0x170/0x2a0
 [<ffffffff8109eb00>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff81097e70>] ? worker_thread+0x0/0x2a0
 [<ffffffff8109e66e>] kthread+0x9e/0xc0
 [<ffffffff8100c20a>] child_rip+0xa/0x20
 [<ffffffff8109e5d0>] ? kthread+0x0/0xc0
 [<ffffffff8100c200>] ? child_rip+0x0/0x20