Kernel panic due to blocked tasks while ext3 scans group descriptors

Issue

• System panicked with this stack trace:

INFO: task kjournald:1237 blocked for more than 120 seconds.
      Not tainted 2.6.32-431.5.1.el6.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kjournald     D 0000000000000002     0  1237      2 0x00000080
 ffff880339379d50 0000000000000046 ffff88033b279540 ffffffff8160bf40
 0000000000000001 ffff88033fc23280 ffff880339379da0 ffffffff81060b13
 ffff880335dcb058 ffff880339379fd8 000000000000fbc8 ffff880335dcb058
Call Trace:
 [<ffffffff81060b13>] ? perf_event_task_sched_out+0x33/0x70
 [<ffffffff8109b5be>] ? prepare_to_wait+0x4e/0x80
 [<ffffffffa01916f1>] journal_commit_transaction+0x161/0x1310 [jbd]
 [<ffffffff8109b290>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff81084d0b>] ? try_to_del_timer_sync+0x7b/0xe0
 [<ffffffffa0196fe8>] kjournald+0xe8/0x250 [jbd]
 [<ffffffff8109b290>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa0196f00>] ? kjournald+0x0/0x250 [jbd]
 [<ffffffff8109aee6>] kthread+0x96/0xa0
 [<ffffffff8100c20a>] child_rip+0xa/0x20
 [<ffffffff8109ae50>] ? kthread+0x0/0xa0
 [<ffffffff8100c200>] ? child_rip+0x0/0x20