CentOS - Dec 2018 - IPv6: ADDRCONF(NETDEV_UP): link is not ready after upgrading to 7.6

Hi, after upgrading to 7.6, kernel 3.10.0-957.1.3.el7.x86_64, at boot instead of
the GUI login screen I got two lines like this:

IPv6: ADDRCONF(NETDEV_UP): em1: link is not ready
IPv6: ADDRCONF(NETDEV_UP): em1: link is not ready

The server is accessible via ssh on IPv4


Server:  DELL PowerEdge T 110 II

NIC: Broadcom, driver tg3, lspci -v:
04:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5722 
Gigabit Ethernet PCI Express
         Subsystem: Dell Device 04de
         Flags: bus master, fast devsel, latency 0, IRQ 33
         Memory at c4a00000 (64-bit, non-prefetchable) [size=64K]
         Expansion ROM at <ignored> [disabled]
         Capabilities: [48] Power Management version 3
         Capabilities: [50] Vital Product Data
         Capabilities: [58] Vendor Specific Information: Len=78 <?>
         Capabilities: [e8] MSI: Enable+ Count=1/1 Maskable- 64bit+
         Capabilities: [d0] Express Endpoint, MSI 00
         Capabilities: [100] Advanced Error Reporting
         Capabilities: [13c] Virtual Channel
         Capabilities: [160] Device Serial Number f8-db-88-ff-fe-fe-b4-57
         Capabilities: [16c] Power Budgeting <?>
         Kernel driver in use: tg3
         Kernel modules: tg3

dmesg says:
[    8.075141] tg3 0000:04:00.0 em1: Link is up at 1000 Mbps, full duplex
[    8.075153] tg3 0000:04:00.0 em1: Flow control is off for TX and off for RX
[    8.075174] IPv6: ADDRCONF(NETDEV_CHANGE): em1: link becomes ready




IPv6 is configured as IGNORE in NetworkManager.

I tried the following with the same result:

net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.all.disable_ipv6 = 1

and reboot, no effect


Setting an automatic IPv6 address: no effect.



Suggestions?


-- 


Ciao,
luigi

/
+--[Luigi Rosa]--
\

On 12/25/18 11:54 PM, Luigi Rosa wrote:
> Hi, after upgrading to 7.6, kernel 3.10.0-957.1.3.el7.x86_64, at boot 
> instead of the GUI login screen I got two lines like this: 

The output you see is probably unrelated to the problem.? Check the 
output of "systemctl status gdm" and /var/log/Xorg.0.log

Gordon Messmer wrote on 30/12/2018 20:59:
>> Hi, after upgrading to 7.6, kernel 3.10.0-957.1.3.el7.x86_64, at boot
instead
>> of the GUI login screen I got two lines like this: 
> 
> The output you see is probably unrelated to the problem.? Check the output
of
> "systemctl status gdm" and /var/log/Xorg.0.log
Thank you! Your suggestion has been very helpful.

systemctl status gdm  showed GDM running as expected, but /var/log/Xorg.0.log 
had many error lines like this:

(EE) FBDEV(0): FBIOPUTCMAP: Invalid argument

The solution proposed in https://www.centos.org/forums/viewtopic.php?t=55418 was
not applicable because fbdev is correctly installed.

Widening the search I found this: 
https://lists.debian.org/debian-x/2014/07/msg00010.html

The solution was to create a file  /etc/X11/xorg.conf.d/99-fbdev-fix.conf with 
this content:


Section "Device"
         Identifier  "Card0"
         Driver      "fbdev"
EndSection



And restart.



-- 


Ciao,
luigi

/
+--[Luigi Rosa]--
\