From: Peter Hurley <peter@hurleysoftware•com>
To: Sree Harsha Totakura <sreeharsha@totakura•in>
Cc: linux-kernel@vger•kernel.org, netdev@vger•kernel.org,
Oleg Nesterov <oleg@redhat•com>
Subject: Re: pppd service crash in linux-3.13.6
Date: Mon, 10 Mar 2014 15:23:06 -0400 [thread overview]
Message-ID: <531E111A.8040207@hurleysoftware.com> (raw)
In-Reply-To: <531DEEA6.4090808@totakura.in>
[ +cc Oleg Nesterov ]
On 03/10/2014 12:56 PM, 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
> [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.
>
> If you need any more info, I am happy to provide.
The NULL ptr dereference is from following the current->nsproxy ptr
in ppp_register_channel().
This was broken by
commit 8aac62706adaaf0fab02c4327761561c8bda9448
Author: Oleg Nesterov <oleg@redhat•com>
Date: Fri Jun 14 21:09:49 2013 +0200
move exit_task_namespaces() outside of exit_notify()
which moved the exit_task_namespaces(tsk) before disassociate_ctty().
Regards,
Peter Hurley
next prev parent reply other threads:[~2014-03-10 19:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <531A37FF.4000509@totakura.in>
2014-03-10 16:56 ` pppd service crash in linux-3.13.6 Sree Harsha Totakura
2014-03-10 19:23 ` Peter Hurley [this message]
2014-03-13 17:06 ` Oleg Nesterov
2014-03-13 17:55 ` Peter Hurley
2014-03-14 14:19 ` Peter Hurley
2014-03-14 15:02 ` Peter Hurley
2014-03-14 19:23 ` Oleg Nesterov
2014-03-14 20:28 ` Peter Hurley
2014-03-14 21:04 ` Oleg Nesterov
2014-03-15 12:49 ` Peter Hurley
2014-03-17 18:04 ` [PATCH 0/2] (Was: pppd service crash in linux-3.13.6) Oleg Nesterov
2014-03-17 18:04 ` [PATCH 1/2] exit: call disassociate_ctty() before exit_task_namespaces() Oleg Nesterov
2014-03-17 18:05 ` [PATCH 2/2] exit: move check_stack_usage() to the end of do_exit() Oleg Nesterov
2014-03-10 19:54 ` pppd service crash in linux-3.13.6 Ben Hutchings
2014-03-12 21:25 ` Sree Harsha Totakura
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