linux-kernel - Re: pppd service crash in linux-3.13.6

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Date:	Mon, 10 Mar 2014 19:54:01 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Sree Harsha Totakura <sreeharsha@...akura.in>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: pppd service crash in linux-3.13.6

On Mon, 2014-03-10 at 17:56 +0100, Sree Harsha Totakura wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi,
> 
> Using linux-3.13.6, I am observing the following output from the pppd
> kernel thread.  This happens when I try to suspend my computer and it
> *stops* the computer from suspending.
> 
> I am using ppp via a bluetooth modem.
> 
> 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

pppd can't be frozen because it crashed earlier in kernel mode.

[...]
> If you need any more info, I am happy to provide.

You should send the 'Oops' messages which should be further up the log
file.

Ben.

-- 
Ben Hutchings
Computers are not intelligent.	They only think they are.

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