[CentOS] dmesg error

I am seeing this in dmesg on Dell Poweredge 860


INFO: task tail:17872 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
tail          D ffff81021ac87040     0 17872  31199
(NOTLB)
 ffff810124fc7bd8 0000000000000082 ffff81021c8ad200 ffff8101714f4d80
 0000000000000000 0000000000000007 ffff81016471b820 ffff81021ac87040
 0000e805f8d72d5b 0000000000002d53 ffff81016471ba08 0000000388055b77
Call Trace:
 [<ffffffff8006ecd9>] do_gettimeofday+0x40/0x90
 [<ffffffff8005a412>] getnstimeofday+0x10/0x29
 [<ffffffff80028bb2>] sync_page+0x0/0x43
 [<ffffffff800637de>] io_schedule+0x3f/0x67
 [<ffffffff80028bf0>] sync_page+0x3e/0x43
 [<ffffffff80063922>] __wait_on_bit_lock+0x36/0x66
 [<ffffffff8003f980>] __lock_page+0x5e/0x64
 [<ffffffff800a34d5>] wake_bit_function+0x0/0x23
 [<ffffffff8000c425>] do_generic_mapping_read+0x1df/0x359
 [<ffffffff8000d251>] file_read_actor+0x0/0x159
 [<ffffffff8000c6eb>] __generic_file_aio_read+0x14c/0x198
 [<ffffffff80016eb7>] generic_file_aio_read+0x36/0x3b
 [<ffffffff8000cf39>] do_sync_read+0xc7/0x104
 [<ffffffff800a34a7>] autoremove_wake_function+0x0/0x2e
 [<ffffffff80063002>] thread_return+0x62/0xfe
 [<ffffffff8000b721>] vfs_read+0xcb/0x171
 [<ffffffff80011d15>] sys_read+0x45/0x6e
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0


What should be done?

jerry