* linux-next: next-20160301: unregister_netdevice: waiting for lo to become free. Usage count = 2
@ 2016-03-01 8:11 Dexuan Cui
2016-03-01 20:07 ` Jeremiah Mahler
0 siblings, 1 reply; 6+ messages in thread
From: Dexuan Cui @ 2016-03-01 8:11 UTC (permalink / raw)
To: netdev@vger.kernel.org; +Cc: Haiyang Zhang
[-- Attachment #1: Type: text/plain, Size: 917 bytes --]
Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V guest, even
when I didn't configure any NIC for the guest:
[ 72.604249] unregister_netdevice: waiting for lo to become free. Usage count = 2
[ 82.708170] unregister_netdevice: waiting for lo to become free. Usage count = 2
[ 92.788079] unregister_netdevice: waiting for lo to become free. Usage count = 2
[ 102.808132] unregister_netdevice: waiting for lo to become free. Usage count = 2
[ 112.928166] unregister_netdevice: waiting for lo to become free. Usage count = 2
[ 122.952069] unregister_netdevice: waiting for lo to become free. Usage count = 2
I don't think this is related to the underlying host, since it's related to "lo".
This should be a recent regression, as I remember the January linux-next didn't have
this issue.
Any idea?
The gzip-ed kernel config is attached FYI.
Thanks,
-- Dexuan
[-- Attachment #2: kernel.config.gz --]
[-- Type: application/x-gzip, Size: 46145 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: linux-next: next-20160301: unregister_netdevice: waiting for lo to become free. Usage count = 2
2016-03-01 8:11 linux-next: next-20160301: unregister_netdevice: waiting for lo to become free. Usage count = 2 Dexuan Cui
@ 2016-03-01 20:07 ` Jeremiah Mahler
2016-03-02 20:31 ` [REGRESSION, bisect] net: ipv6: " Jeremiah Mahler
0 siblings, 1 reply; 6+ messages in thread
From: Jeremiah Mahler @ 2016-03-01 20:07 UTC (permalink / raw)
To: Dexuan Cui; +Cc: netdev@vger.kernel.org, Haiyang Zhang
Hi all,
On Tue, Mar 01, 2016 at 08:11:54AM +0000, Dexuan Cui wrote:
> Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V guest, even
> when I didn't configure any NIC for the guest:
>
> [ 72.604249] unregister_netdevice: waiting for lo to become free. Usage count = 2
> [ 82.708170] unregister_netdevice: waiting for lo to become free. Usage count = 2
> [ 92.788079] unregister_netdevice: waiting for lo to become free. Usage count = 2
> [ 102.808132] unregister_netdevice: waiting for lo to become free. Usage count = 2
> [ 112.928166] unregister_netdevice: waiting for lo to become free. Usage count = 2
> [ 122.952069] unregister_netdevice: waiting for lo to become free. Usage count = 2
>
> I don't think this is related to the underlying host, since it's related to "lo".
>
> This should be a recent regression, as I remember the January linux-next didn't have
> this issue.
>
> Any idea?
>
> The gzip-ed kernel config is attached FYI.
>
> Thanks,
> -- Dexuan
>
Just a "me too", but I have this problem on a Lenovo Carbon X1 when
running linux-next 20160301. It worked with 20160225.
I can test patches and I will try to bisect the problem as time allows.
--
- Jeremiah Mahler
^ permalink raw reply [flat|nested] 6+ messages in thread
* [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for lo to become free. Usage count = 2
2016-03-01 20:07 ` Jeremiah Mahler
@ 2016-03-02 20:31 ` Jeremiah Mahler
2016-03-02 21:00 ` David Ahern
0 siblings, 1 reply; 6+ messages in thread
From: Jeremiah Mahler @ 2016-03-02 20:31 UTC (permalink / raw)
To: David Ahern
Cc: Dexuan Cui, netdev@vger.kernel.org, Haiyang Zhang,
David S. Miller, linux-kernel
Hi David,
On Tue, Mar 01, 2016 at 12:07:49PM -0800, Jeremiah Mahler wrote:
> Hi all,
>
> On Tue, Mar 01, 2016 at 08:11:54AM +0000, Dexuan Cui wrote:
> > Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V guest, even
> > when I didn't configure any NIC for the guest:
> >
> > [ 72.604249] unregister_netdevice: waiting for lo to become free. Usage count = 2
> > [ 82.708170] unregister_netdevice: waiting for lo to become free. Usage count = 2
> > [ 92.788079] unregister_netdevice: waiting for lo to become free. Usage count = 2
> > [ 102.808132] unregister_netdevice: waiting for lo to become free. Usage count = 2
> > [ 112.928166] unregister_netdevice: waiting for lo to become free. Usage count = 2
> > [ 122.952069] unregister_netdevice: waiting for lo to become free. Usage count = 2
> >
> > I don't think this is related to the underlying host, since it's related to "lo".
> >
> > This should be a recent regression, as I remember the January linux-next didn't have
> > this issue.
> >
> > Any idea?
> >
> > The gzip-ed kernel config is attached FYI.
> >
> > Thanks,
> > -- Dexuan
> >
>
> Just a "me too", but I have this problem on a Lenovo Carbon X1 when
> running linux-next 20160301. It worked with 20160225.
>
> I can test patches and I will try to bisect the problem as time allows.
>
> --
> - Jeremiah Mahler
I performed a bisect and found that the following patch introduced the
regression.
From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac Mon Sep 17 00:00:00 2001
From: David Ahern <dsa@cumulusnetworks.com>
Date: Wed, 24 Feb 2016 09:25:37 -0800
Subject: [PATCH] net: ipv6: Make address flushing on ifdown optional
Currently, all ipv6 addresses are flushed when the interface is configured
down, including global, static addresses:
$ ip -6 addr show dev eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
inet6 2100:1::2/120 scope global
valid_lft forever preferred_lft forever
inet6 fe80::e0:f9ff:fe79:34bd/64 scope link
valid_lft forever preferred_lft forever
$ ip link set dev eth1 down
$ ip -6 addr show dev eth1
<< nothing; all addresses have been flushed>>
Add a new sysctl to make this behavior optional. The new setting defaults to
flush all addresses to maintain backwards compatibility. When the set global
addresses with no expire times are not flushed on an admin down. The sysctl
is per-interface or system-wide for all interfaces
$ sysctl -w net.ipv6.conf.eth1.keep_addr_on_down=1
or
$ sysctl -w net.ipv6.conf.all.keep_addr_on_down=1
Will keep addresses on eth1 on an admin down.
$ ip -6 addr show dev eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
inet6 2100:1::2/120 scope global
valid_lft forever preferred_lft forever
inet6 fe80::e0:f9ff:fe79:34bd/64 scope link
valid_lft forever preferred_lft forever
$ ip link set dev eth1 down
$ ip -6 addr show dev eth1
3: eth1: <BROADCAST,MULTICAST> mtu 1500 state DOWN qlen 1000
inet6 2100:1::2/120 scope global tentative
valid_lft forever preferred_lft forever
inet6 fe80::e0:f9ff:fe79:34bd/64 scope link tentative
valid_lft forever preferred_lft forever
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
Documentation/networking/ip-sysctl.txt | 9 +++
include/linux/ipv6.h | 1 +
include/uapi/linux/ipv6.h | 1 +
net/ipv6/addrconf.c | 136 +++++++++++++++++++++++++++++----
4 files changed, 132 insertions(+), 15 deletions(-)
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 24ce97f..d5df40c 100644
[...]
--
2.7.0
--
- Jeremiah Mahler
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for lo to become free. Usage count = 2
2016-03-02 20:31 ` [REGRESSION, bisect] net: ipv6: " Jeremiah Mahler
@ 2016-03-02 21:00 ` David Ahern
2016-03-03 1:23 ` Jeremiah Mahler
0 siblings, 1 reply; 6+ messages in thread
From: David Ahern @ 2016-03-02 21:00 UTC (permalink / raw)
To: Jeremiah Mahler, Dexuan Cui, netdev@vger.kernel.org,
Haiyang Zhang, David S. Miller, linux-kernel
On 3/2/16 12:31 PM, Jeremiah Mahler wrote:
>> On Tue, Mar 01, 2016 at 08:11:54AM +0000, Dexuan Cui wrote:
>>> Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V guest, even
>>> when I didn't configure any NIC for the guest:
>>>
>>> [ 72.604249] unregister_netdevice: waiting for lo to become free. Usage count = 2
>>> [ 82.708170] unregister_netdevice: waiting for lo to become free. Usage count = 2
>>> [ 92.788079] unregister_netdevice: waiting for lo to become free. Usage count = 2
>>> [ 102.808132] unregister_netdevice: waiting for lo to become free. Usage count = 2
>>> [ 112.928166] unregister_netdevice: waiting for lo to become free. Usage count = 2
>>> [ 122.952069] unregister_netdevice: waiting for lo to become free. Usage count = 2
>>>
>>> I don't think this is related to the underlying host, since it's related to "lo".
This should fix it:
https://patchwork.ozlabs.org/patch/591102/
David
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for lo to become free. Usage count = 2
2016-03-02 21:00 ` David Ahern
@ 2016-03-03 1:23 ` Jeremiah Mahler
2016-03-03 5:25 ` Dexuan Cui
0 siblings, 1 reply; 6+ messages in thread
From: Jeremiah Mahler @ 2016-03-03 1:23 UTC (permalink / raw)
To: David Ahern
Cc: Dexuan Cui, netdev@vger.kernel.org, Haiyang Zhang,
David S. Miller, linux-kernel
Hi David,
On Wed, Mar 02, 2016 at 01:00:21PM -0800, David Ahern wrote:
> On 3/2/16 12:31 PM, Jeremiah Mahler wrote:
> >>On Tue, Mar 01, 2016 at 08:11:54AM +0000, Dexuan Cui wrote:
> >>>Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V guest, even
> >>>when I didn't configure any NIC for the guest:
> >>>
> >>>[ 72.604249] unregister_netdevice: waiting for lo to become free. Usage count = 2
> >>>[ 82.708170] unregister_netdevice: waiting for lo to become free. Usage count = 2
> >>>[ 92.788079] unregister_netdevice: waiting for lo to become free. Usage count = 2
> >>>[ 102.808132] unregister_netdevice: waiting for lo to become free. Usage count = 2
> >>>[ 112.928166] unregister_netdevice: waiting for lo to become free. Usage count = 2
> >>>[ 122.952069] unregister_netdevice: waiting for lo to become free. Usage count = 2
> >>>
> >>>I don't think this is related to the underlying host, since it's related to "lo".
>
> This should fix it:
> https://patchwork.ozlabs.org/patch/591102/
>
>
> David
That patch fixes the problem on my machine.
Thanks for the quick fix :-)
--
- Jeremiah Mahler
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for lo to become free. Usage count = 2
2016-03-03 1:23 ` Jeremiah Mahler
@ 2016-03-03 5:25 ` Dexuan Cui
0 siblings, 0 replies; 6+ messages in thread
From: Dexuan Cui @ 2016-03-03 5:25 UTC (permalink / raw)
To: Jeremiah Mahler, David Ahern
Cc: netdev@vger.kernel.org, Haiyang Zhang, David S. Miller,
linux-kernel@vger.kernel.org
> Hi David,
> On Wed, Mar 02, 2016 at 01:00:21PM -0800, David Ahern wrote:
> > On 3/2/16 12:31 PM, Jeremiah Mahler wrote:
> > >>On Tue, Mar 01, 2016 at 08:11:54AM +0000, Dexuan Cui wrote:
> > >>>Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V
> guest, even
> > >>>when I didn't configure any NIC for the guest:
> > >>>
> > >>>[ 72.604249] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[ 82.708170] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[ 92.788079] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[ 102.808132] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[ 112.928166] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[ 122.952069] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>
> > >>>I don't think this is related to the underlying host, since it's related to "lo".
> >
> > This should fix it:
> > https://patchwork.ozlabs.org/patch/591102/
>
> > David
>
> That patch fixes the problem on my machine.
> Thanks for the quick fix :-)
>
> - Jeremiah Mahler
This works for me too! Thanks!
Thanks,
-- Dexuan
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2016-03-03 5:26 UTC | newest]
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2016-03-01 8:11 linux-next: next-20160301: unregister_netdevice: waiting for lo to become free. Usage count = 2 Dexuan Cui
2016-03-01 20:07 ` Jeremiah Mahler
2016-03-02 20:31 ` [REGRESSION, bisect] net: ipv6: " Jeremiah Mahler
2016-03-02 21:00 ` David Ahern
2016-03-03 1:23 ` Jeremiah Mahler
2016-03-03 5:25 ` Dexuan Cui
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