On Mon, 3 Nov 2014 08:33:27 -0500
Jerry Geis <geisj at pagestation.com> wrote:
> I am seeing this in dmesg on Dell Poweredge 860
>
>
> INFO: task tail:17872 blocked for more than 120 seconds.
It's a generic "something might be wrong" alert issued since (in
this
case) a tail process blocked (on I/O) for more than 120s. It can be I/O
overload, flaky remote filesystems, badly behaving drivers, too slow
(I/O) hardware...
/Peter
> "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
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