From mboxrd@z Thu Jan  1 00:00:00 1970
From: hdf3@comcast.net (don fisher)
Date: Tue, 25 Sep 2018 18:26:06 -0700
Subject: Problem with netconsole and eth0 timing
Message-ID: <0f831765-c3f1-17e9-b029-1a7e52d8a38d@comcast.net>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

I am trying to use netconsole to examine some problems I am having 
booting Alienware 13 r3 and 14 laptops. I am running opensuse 42.3 with 
generic 4.18.7 kernel configured to include netconsole. After building 
my kernel and including the proper command (as shown below) in the linux 
boot string:
  netconsole=64001 at 192.168.7.60/eth0,64001 at 192.168.7.55/34:e6:d7:01:2a:dd
I receive the following error message, as shown by journalctl:

sudo journalctl -b | grep netconsole
Sep 24 22:01:25 dfpc60 kernel: netpoll: netconsole: local port 64001
Sep 24 22:01:25 dfpc60 kernel: netpoll: netconsole: local IPv4 address 
192.168.7.60
Sep 24 22:01:25 dfpc60 kernel: netpoll: netconsole: interface 'eth0'
Sep 24 22:01:25 dfpc60 kernel: netpoll: netconsole: remote port 64001
Sep 24 22:01:25 dfpc60 kernel: netpoll: netconsole: remote IPv4 address 
192.168.7.55
Sep 24 22:01:25 dfpc60 kernel: netpoll: netconsole: remote ethernet 
address 34:e6:d7:01:2a:dd
Sep 24 22:01:25 dfpc60 kernel: netpoll: netconsole: eth0 doesn't exist, 
aborting
Sep 24 22:01:25 dfpc60 kernel: netconsole: cleaning up
Sep 24 22:01:25 dfpc60 systemd-modules-load[185]: Module 'netconsole' is 
builtin

I examined the timing in more detail and found that the above "eth0: 
doesn't exist" message comes at Sep 24 22:01:25.080603.

The wicked message eth0: up comes at Sep 24 22:02:01.173616. The 
difference is maybe 36 seconds? There is an eth0: avail message at Sep 
24 22:01:34.112744, don't know if that would suffice for netconsole Both 
are after netconsole has bailed out. Any obvious solutions I am missing? 
The documentation is pretty clear on how to set this up, so there must 
be some way to get it to work. I could find nothing on Google.

This is my first post to this list, so if this question is not 
appropriate please let me know without flames:-)

Don