jbd2 tasks become blocked for more than 120 seconds in Red Hat Enterprise Linux 6

Issue

• System reports blocked jbd2 processes with the following call trace:

INFO: task jbd2/dm-47-8:6937 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
jbd2/dm-47-8  D 000000000000000b     0  6937      2 0x00000080
 ffff8a1fd1363d20 0000000000000046 0000000000016700 0000000000016700
 ffff8a1fd34bd800 0000000000016700 0000000000016700 ffff8a1fd0493540
 ffff8a1fd0493af8 ffff8a1fd1363fd8 000000000000fb88 ffff8a1fd0493af8
Call Trace:
 [<ffffffff81096f8e>] ? prepare_to_wait+0x4e/0x80
 [<ffffffffa025a7cf>] jbd2_journal_commit_transaction+0x19f/0x14b0 [jbd2]
 [<ffffffff810096f0>] ? __switch_to+0xd0/0x320
 [<ffffffff8105e759>] ? find_busiest_queue+0x69/0x150
 [<ffffffff81080fcc>] ? lock_timer_base+0x3c/0x70
 [<ffffffff81096ca0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa0260f38>] kjournald2+0xb8/0x220 [jbd2]
 [<ffffffff81096ca0>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa0260e80>] ? kjournald2+0x0/0x220 [jbd2]
 [<ffffffff81096936>] kthread+0x96/0xa0
 [<ffffffff8100c0ca>] child_rip+0xa/0x20
 [<ffffffff810968a0>] ? kthread+0x0/0xa0
 [<ffffffff8100c0c0>] ? child_rip+0x0/0x20
Kernel panic - not syncing: hung_task: blocked tasks