netdev - Re: Fw: [Bug 54601] New: PPP regression on 3.2.39 stop work need restart server ont version 3.2.21 not found this problem.

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Date:	Mon, 4 Mar 2013 22:48:37 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	netdev@...r.kernel.org, micron10@...il.com,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: Fw: [Bug 54601] New: PPP regression on 3.2.39 stop work need
 restart server ont version 3.2.21 not found this problem.

On Fri, Mar 01, 2013 at 08:47:05AM -0800, Stephen Hemminger wrote:
> 
> 
> Begin forwarded message:
> 
> Date: Fri, 1 Mar 2013 01:24:14 -0800
> From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
> To: "stephen@...workplumber.org" <stephen@...workplumber.org>
> Subject: [Bug 54601] New: PPP regression on 3.2.39 stop work need restart server ont version 3.2.21 not found this problem.
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=54601
> 
>            Summary: PPP regression on 3.2.39 stop work need restart server
>                     ont version 3.2.21 not found this problem.
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 3.2.39
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: Other
>         AssignedTo: shemminger@...ux-foundation.org
>         ReportedBy: micron10@...il.com
>         Regression: Yes
> 
> 
> Hi
> watch a problem with PPP after upgrade to version 3.2.39 ppp service stop work
> 2 hours after start with this crash :
> 
> [79619.180026] unregister_netdevice: waiting for ppp618 to become free. Usage
> count = 562
[...]
> [79862.540040] unregister_netdevice: waiting for ppp618 to become free. Usage
> count = 30
> [79872.680037] unregister_netdevice: waiting for ppp618 to become free. Usage
> count = 9
[...]

So there are many references left to the device, which slowly go away
(very slowly, about 2 per second).  Maybe there are skbs in a queue somewhere
that still refer to the PPP device.

Since this a regression between 3.2.21 and 3.2.29, it might have been
introduced by:

commit 73a3346556281fd56f39f0a9475249e5039d8807
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Thu Jun 14 06:42:44 2012 +0000

    net: remove skb_orphan_try()
    
    commit 62b1a8ab9b3660bb820d8dfe23148ed6cda38574 upstream.

But this is a bit of a guess.  And I don't think that this change
would do more than expose/exacerbate a bug that already existed.

Ben.

-- 
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
                                                              - Albert Camus
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