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TITLE: INFO: task hung in tty_ldisc_hangup
[ 843.240752] INFO: task getty:2986 blocked for more than 120 seconds.
[ 843.247365] Not tainted 3.18.0-13280-g93f6785-dirty #12
[ 843.253777] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 843.261764] getty D ffffffff83e27d60 28152 2986 1 0x00000002
[ 843.269316] ffff88005bb6f908 0000000000000046 ffff880050b6ab70 ffff880061e1c5d0
[ 843.277435] fffffbfff07c4802 ffff880061e1cde8 ffffffff83e27d60 ffff88005cb71580
[ 843.285515] ffff88005bb6f968 0000000000000000 1ffff1000b76df2b ffff88005cb71580
[ 843.293802] Call Trace:
[ 843.296385] [<ffffffff835bdeb4>] schedule+0x64/0x160
[ 843.301593] [<ffffffff835c9c1a>] schedule_timeout+0x2fa/0x5d0
[ 843.307563] [<ffffffff835c9920>] ? console_conditional_schedule+0x30/0x30
[ 843.314790] [<ffffffff811c1eb2>] ? pick_next_task_fair+0xeb2/0x1680
[ 843.321296] [<ffffffff81d9b3ed>] ? check_preemption_disabled+0x3d/0x210
[ 843.328311] [<ffffffff835cb4ec>] ldsem_down_write+0x1ac/0x357
[ 843.334295] [<ffffffff835cb340>] ? ldsem_down_read+0x3a0/0x3a0
[ 843.340437] [<ffffffff835bec62>] ? preempt_schedule+0x62/0xa0
[ 843.346418] [<ffffffff835cbdd2>] tty_ldisc_lock_pair_timeout+0xb2/0x160
[ 843.353363] [<ffffffff81f8b03f>] tty_ldisc_hangup+0x21f/0x720
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