pppd service crash in linux-3.13.6

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Hi,

Using linux-3.13.6, I observed the following output from the pppd kernel
thread.  This happened when I tried to suspend my computer and it
*stops* the computer from suspending.  Before going to suspend, I had
used ppp to connect via my bluetooth modem and I later found that the
connection was broken abruptly with a similar trace output.

Trace:
[22735.115313] PM: Syncing filesystems ... done.
[22735.665613] PM: Preparing system for mem sleep
[22735.665829] Freezing user space processes ...
[22755.659538] Freezing of tasks failed after 20.004 seconds (1 tasks
refusing to freeze, wq_
busy=0):
[22755.659555] pppd            D ffff8800376c9a58     0 16801      1
0x00000006
[22755.659557]  ffff8800376c9750 0000000000000046 0000000000012e80
0000000000012e80
[22755.659560]  ffff8802a1c1dfd8 ffff8800376c9750 0000000000000009
ffff8802a1c1dd78
[22755.659562]  0000000000000046 ffff8800376c9750 0000000000000028
ffff8800376c9750
[22755.659564] Call Trace:
[22755.659569]  [<ffffffff81048507>] ? do_exit+0x937/0xa50
[22755.659573]  [<ffffffff814bb6e1>] ? oops_end+0x91/0xd0
[22755.659575]  [<ffffffff814b1f4f>] ? no_context+0x1f3/0x1ff
[22755.659577]  [<ffffffff814bdb69>] ? __do_page_fault+0x89/0x500
[22755.659581]  [<ffffffff811017dc>] ? free_pcppages_bulk+0x17c/0x3b0
[22755.659584]  [<ffffffff81101cce>] ? free_hot_cold_page_list+0x3e/0x90
[22755.659586]  [<ffffffff814babf8>] ? page_fault+0x28/0x30
[22755.659591]  [<ffffffffa06fd5a3>] ? ppp_register_channel+0x13/0x20
[ppp_generic]
[22755.659594]  [<ffffffffa07062ab>] ? ppp_asynctty_open+0x12b/0x170
[ppp_async]
[22755.659596]  [<ffffffff812ec907>] ? tty_ldisc_open.isra.2+0x27/0x60
[22755.659598]  [<ffffffff812ed1d3>] ? tty_ldisc_hangup+0x1e3/0x220
[22755.659601]  [<ffffffff812e4614>] ? __tty_hangup+0x2c4/0x440
[22755.659603]  [<ffffffff812e56a1>] ? disassociate_ctty+0x61/0x270
[22755.659605]  [<ffffffff810483c2>] ? do_exit+0x7f2/0xa50
[22755.659607]  [<ffffffff81053ad2>] ? recalc_sigpending+0x12/0x50
[22755.659609]  [<ffffffff81054308>] ? __set_task_blocked+0x28/0x70
[22755.659611]  [<ffffffff81048684>] ? do_group_exit+0x34/0xa0
[22755.659613]  [<ffffffff810486fb>] ? SyS_exit_group+0xb/0x10
[22755.659615]  [<ffffffff814c1eb9>] ? system_call_fastpath+0x16/0x1b
[22755.659618]
[22755.659619] Restarting tasks ... done.

Regards,
Sree
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