linux-kernel - netconsole on opensuse 42.3 with a 4.18.7 kernel hangs

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Message-ID: <1912e0c1-5ebe-5d76-2eb0-71d70a28f3bd@comcast.net>
Date:   Thu, 18 Oct 2018 15:02:48 -0700
From:   don fisher <hdf3@...cast.net>
To:     linux-kernel@...r.kernel.org
Subject: netconsole on opensuse 42.3 with a 4.18.7 kernel hangs

I have been watching posts on this list and see that many users employ 
netconsole. My netconsole is native to the 4.18.7 kernel, and works 
perfectly for about 13 sec ( 12.954965 last attempt) after boot. It then 
hangs. 709 lines are transmitted before the hang. If I examine 
/var/log/messages there are a lot of systemd messages printed 
immediately after the last successful kernel message that was 
transmitted by netconsole.

I thought that anything that went to printk also went to netconsole. But 
netconsole does not appear to be awakened after the first systemd 
message is logged. I have examined netconsole.c and printk.c, but am 
overwhelmed and am not able to determine what triggers netconsole. I 
feel that the trigger may be negated by systemd or some other part of 
system startup. I am running opensuse 42.3 and have not had any replies 
from their lists. I feel it is that the native netconsole is not a 
component of their distribution so it is my problem.

I can forward any data desired output from dmesg, netconsole, or 
/var/log/messages. Any assistance would be greatly appreciated.

Don