Bug#858125: e1000: ethernet interface hangs occasionally, kernel reports hang

["Bruce Momjian,,," <bruce@momjian.us>]

On Wed, Mar 22, 2017 at 11:41:57PM -0400, Bruce Momjian,,, wrote:
> > OK, I am running this after setting flow control on/default on the
> > switch and Debian, and rebooting:
> > 
> > 	daemon -- sh -c "while :; do date;ethtool -S eth0| grep flow_control;
> > 	sleep 1;done > /root/ethtool"
> > 
> > I will report back with the relevant logging lines once it hangs again. 
> 
> OK, I have results of a hang after 24 hours of uptime.  The hangs are
> listed here via dmesg -T:
> 
> 	http://momjian.us/expire/eth0/dmesg.txt
> 
> showing the watchdog warning/hang/reset at 23:01 and port hang/reset at
> 23:10.
> 
> I have also produced the ethtool -S output every second for the entire
> 24-hour period, gziped, at:
> 
> 	http://momjian.us/expire/eth0/ethtool.gz
> 
> You will see reception of a large number of rx_flow_control_xoff
> messages about 50 minutes before the hangs, and just before the hangs.

I had four more 14 hours later so I created new files that also include
the earlier ones:

	http://momjian.us/expire/eth0/dmesg2.txt
	http://momjian.us/expire/eth0/ethtool2.gz

The last two dmesg lines at 13:29  are me turning of flow control on the
switch so they are not problems.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
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