INFO: task iptables:8908 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
iptables      D ffffffff80154ff4     0  8908   8839                     (NOTLB)
 ffff81050fb53278 0000000000000082 ffffef4000000460 ffffef5000000478
 ffffef7000000490 0000000000000001 ffff81062867f080 ffff81033fd650c0
 00231bc5acbe8084 000000000005ed50 ffff81062867f268 0000000a00000000
Call Trace:
 [<ffffffff80063171>] wait_for_completion+0x79/0xa2
 [<ffffffff8008e9c9>] default_wake_function+0x0/0xe
 [<ffffffff8009f6f9>] call_usermodehelper_keys+0xe3/0xf8
 [<ffffffff8009f70e>] __call_usermodehelper+0x0/0x4f
 [<ffffffff8009fae6>] request_module+0x139/0x14d
 [<ffffffff80063ad7>] mutex_lock_interruptible+0x9/0x1e
 [<ffffffff8850ec36>] :x_tables:xt_find_table_lock+0x94/0x9c
 [<ffffffff8851c5a4>] :ip_tables:get_info+0x8b/0x19c
 [<ffffffff8000b516>] __find_get_block+0x162/0x172
 [<ffffffff88031cb7>] :jbd:do_get_write_access+0x4ed/0x522
 [<ffffffff80019e51>] __getblk+0x25/0x22c
 [<ffffffff8804d991>] :ext3:ext3_mark_iloc_dirty+0x300/0x368
 [<ffffffff8000b516>] __find_get_block+0x162/0x172
 [<ffffffff8804ddc6>] :ext3:ext3_mark_inode_dirty+0x33/0x3c
 [<ffffffff88031cb7>] :jbd:do_get_write_access+0x4ed/0x522
 [<ffffffff80019e51>] __getblk+0x25/0x22c
 [<ffffffff8804d991>] :ext3:ext3_mark_iloc_dirty+0x300/0x368
 [<ffffffff8804ddc6>] :ext3:ext3_mark_inode_dirty+0x33/0x3c
 [<ffffffff8804ea49>] :ext3:ext3_get_blocks_handle+0x900/0x9be
 [<ffffffff8000769e>] find_get_page+0x21/0x51
 [<ffffffff800cf0ca>] zone_statistics+0x3e/0x6d
 [<ffffffff8000ac00>] get_page_from_freelist+0x380/0x442