linux-kernel - [Linux 4.2-rc8+...v4.3-rc2] REGRESSION: ppp: circular locking dependency detected: [pppd] ppp_dev_uninit()

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Date:	Wed, 23 Sep 2015 08:06:16 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Guillaume Nault <g.nault@...halink.fr>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [Linux 4.2-rc8+...v4.3-rc2] REGRESSION: ppp: circular locking
 dependency detected: [pppd] ppp_dev_uninit() | rtnl_lock()

On Mon, Sep 21, 2015 at 12:56 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Sun, Sep 13, 2015 at 9:19 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>> On Fri, Sep 4, 2015 at 10:32 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>>> Could this be caused by this commit...?
>>>>
>>>> commit 8cb775bc0a34dc596837e7da03fd22c747be618b
>>>> "ppp: fix device unregistration upon netns deletion"
>>>>
>>>
>>> With the Revert "ppp: fix device unregistration upon netns deletion" I
>>> do not see any lockdep issues.
>>>
>>
>> I still see this issue with Linux v4.3-rc1.
>>
>> [ TEST-CASE (reproducible) ]
>>
>> root# stop network-manager
>>
>> root# modprobe -r -v ppp_deflate
>>
>> [ /TEST-CASE ]
>>
>
> Still seeing this with v4.3-rc2 and above test-case.
>

[ EDIT: Add "REGRESSION" to email-subject ]

Ping! Peng! Pong!

I pulled in net.git/master up to commit
fbd03513bf36c4e5c2942f436f05c8eb99a3cc9e ("net: dsa: Fix Marvell
Egress Trailer check") on top of Linux v4.3-rc2 and still see this.

I am using a 3G/3.5G (UMTS/HSPA) modem to connect to the Internet
(more details see dmesg-log and my kernel-config)

Without reverting the below culprit ppp patch...

commit/?id=8cb775bc0a34dc596837e7da03fd22c747be618b
("ppp: fix device unregistration upon netns deletion")

...I have an unstable Internet connection via Network-Manager/ModemManager.

First I saw this with Linux v4.2.

Please, take care of this issue.

Thanks.

- Sedat -

View attachment "dmesg_4.3.0-rc2-4-iniza-small_pppd.txt" of type "text/plain" (70932 bytes)

Download attachment "config-4.3.0-rc2-4-iniza-small" of type "application/octet-stream" (130219 bytes)

View attachment "4.3.0-rc2-4-iniza-small.patch" of type "text/x-patch" (121891 bytes)