Comment 2 for bug 1354739

[20040.504082] INFO: task python:12341 blocked for more than 120 seconds.
[20040.504091] Not tainted 3.13.0-32-generic #57-Ubuntu
[20040.504093] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[20040.504096] python D c166dcc0 0 12341 1 0x00000000
[20040.504102] c790dec8 00200086 0000120e c166dcc0 f73e6540 c1a8d540 c1920a00 c1037d5a
[20040.504111] c1a8d540 c1920a00 c477cda0 f73d8540 c88f8000 f73e6540 c88f8000 c790dea4
[20040.504119] c1080cc8 000f4240 00000000 f73e6540 c88f8000 f73e6540 f73e6540 c790deb4
[20040.504127] Call Trace:
[20040.504139] [<c1037d5a>] ? native_smp_send_reschedule+0x3a/0x50
[20040.504144] [<c1080cc8>] ? ttwu_do_wakeup+0x18/0x120
[20040.504149] [<c1082a20>] ? try_to_wake_up+0x150/0x240
[20040.504164] [<c1654c73>] schedule_preempt_disabled+0x23/0x60
[20040.504169] [<c16565bd>] __mutex_lock_slowpath+0x10d/0x171
[20040.504175] [<c1655aec>] mutex_lock+0x1c/0x28
[20040.504181] [<f87b6bfb>] pp_ioctl+0x1b/0x40 [ppdev]
[20040.504187] [<f87b6be0>] ? pp_do_ioctl+0x860/0x860 [ppdev]
[20040.504192] [<c1189c92>] do_vfs_ioctl+0x2e2/0x4d0
[20040.504197] [<c165b277>] ? __do_page_fault+0x237/0x510
[20040.504201] [<c1186bcd>] ? final_putname+0x1d/0x40
[20040.504205] [<c1186d74>] ? putname+0x24/0x40
[20040.504211] [<c1178666>] ? do_sys_open+0x196/0x260
[20040.504215] [<c1189ee0>] SyS_ioctl+0x60/0x80
[20040.504220] [<c165efcd>] sysenter_do_call+0x12/0x28