Bug 990139

Please try again unplugging and plugging the cable and then grab and attach /var/log/messages file. Do you see any errors in dmesg?
$ nmcli -f general dev list iface eno1

(the interface seems to have change from eno1 to em1 :S)

# nmcli -f general dev list iface em1
GENERAL.DEVICE:                         em1
GENERAL.TYPE:                           802-3-ethernet
GENERAL.VENDOR:                         Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT:                        --
GENERAL.DRIVER:                         r8169
GENERAL.DRIVER-VERSION:                 2.3LK-NAPI
GENERAL.FIRMWARE-VERSION:               rtl8411-1_0.0.3 06/18/12
GENERAL.HWADDR:                         AC:16:2D:49:89:85
GENERAL.STATE:                          20 (unavailable)
GENERAL.REASON:                         40 (Carrier/link changed)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.2/net/em1
GENERAL.IP-IFACE:                       
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.CONNECTION:                     not connected

Mark, any chance you can attach /var/log/messages showing the cable plug/unplug as Jirka requested?

Also, whats the output of:

cat /sys/class/net/em1/carrier

Sorry for the omission of /var/log/messages before. It is being uploaded, but it will be rather slow on my DSL connection (13MB file)

Here is the output you also requested

$ sudo cat /sys/class/net/em1/carrier 
0

(In reply to Mark Harfouche from comment #4)
> Sorry for the omission of /var/log/messages before. It is being uploaded,
> but it will be rather slow on my DSL connection (13MB file)
> 
> Here is the output you also requested
> 
> $ sudo cat /sys/class/net/em1/carrier 
> 0

Is this with the cable plugged in?  If so, then this indicates a kernel bug, since when a cable is connected, this should be '1'.

Yes the cable is still plugged in. My router detects that there is something at the other end too. Does this mean it is a Kernel bug?

Kernel version
Linux charlie 3.10.3-300.fc19.x86_64 #1 SMP Fri Jul 26 00:00:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

I think this was happening with kernel 3.9 too, can't check now since it would stop the upload.

Created attachment 781281 [details]
/var/log/messages after disconnect and reconnect

(In reply to Mark Harfouche from comment #6)
> Yes the cable is still plugged in. My router detects that there is something
> at the other end too. Does this mean it is a Kernel bug?
> 
> Kernel version
> Linux charlie 3.10.3-300.fc19.x86_64 #1 SMP Fri Jul 26 00:00:58 UTC 2013
> x86_64 x86_64 x86_64 GNU/Linux
> 
> I think this was happening with kernel 3.9 too, can't check now since it
> would stop the upload.

Yes, if a cable is plugged in, and 'ifconfig' shows the interface is UP, then we expect /sys/class/net/em1/carrier to be 1.  If that's not the case, then there's a driver bug in the kernel.

In your logs, this is the kernel message about link changes:

Jul 31 13:02:07 charlie kernel: [ 3392.683673] r8169 0000:01:00.2 em1: link up
Jul 31 13:02:16 charlie kernel: [ 3401.572235] r8169 0000:01:00.2 em1: link down

if you run:

watch -n 1 "dmesg | tail -n 30"

and plug/unplug the cable every 2 seconds or so, do you see a corresponding message for each plug/unplug?  If not, it's almost definitely a kernel bug.

You know what is really weird, if 

unplug it, and plug it back in quickly, I see 

[ 6529.022955] r8169 0000:01:00.2 em1: link up
[ 6537.654244] r8169 0000:01:00.2 em1: link down
[ 6539.611636] r8169 0000:01:00.2 em1: link up
[ 6541.945655] r8169 0000:01:00.2 em1: link down
[ 6543.587587] r8169 0000:01:00.2 em1: link up
[ 6573.517569] r8169 0000:01:00.2 em1: link down
[ 6575.143578] r8169 0000:01:00.2 em1: link up

running watch -n 1 "dmesg | tail -n 30"

(I tested it a few times there)

But if i wait until the little NetworkManager icon in Gnome-Shell notices that the interface is down (roughly 2 seconds), then it won't detect that the ethernet cable is in anymore.








Note: I don't need to reset my interface, I don't need to restart NetworkMangager via

systemctl restart NetworkManager

I only need to restart the interface
sudo ifconfig em1 down
sudo ifconfig em1 up

I don't see any error messages in dmseg.

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