Server crashed with hung task panic trigger after "jbd2/dm-9-8:762" was blocked for more than 120 seconds.

Issue

• Server crashed with hung task panic trigger after "jbd2/dm-9-8:762" was blocked for more than 120 seconds.

crash> log
INFO: task jbd2/dm-9-8:762 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
jbd2/dm-9-8   D ffff81043e0a1420     0   762    585           763   748 (L-TLB)
 ffff81041daa7d60 0000000000000046 ffff81041daa7d00 ffffffff8008cf5f
 0000000000000001 000000000000000a ffff81102aa04080 ffff810c3e1197e0
 000123b39f5946b9 0000000000000bab ffff81102aa04268 0000000300000000
Call Trace:
 [<ffffffff8008cf5f>] find_busiest_group+0x20d/0x621
 [<ffffffff88582f6d>] :jbd2:jbd2_journal_commit_transaction+0x191/0x1068
 [<ffffffff800a28b4>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8003dbe6>] lock_timer_base+0x1b/0x3c
 [<ffffffff8004b23a>] try_to_del_timer_sync+0x7f/0x88
 [<ffffffff88586f7c>] :jbd2:kjournald2+0x9a/0x1ec
 [<ffffffff800a28b4>] autoremove_wake_function+0x0/0x2e
 [<ffffffff88586ee2>] :jbd2:kjournald2+0x0/0x1ec
 [<ffffffff800a269c>] keventd_create_kthread+0x0/0xc4
 [<ffffffff80032974>] kthread+0xfe/0x132
 [<ffffffff8005dfb1>] child_rip+0xa/0x11
 [<ffffffff800a269c>] keventd_create_kthread+0x0/0xc4
 [<ffffffff80032876>] kthread+0x0/0x132
 [<ffffffff8005dfa7>] child_rip+0x0/0x11

Kernel panic - not syncing: hung_task: blocked tasks