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[Bug 1552788] Re: network lost after large number of reboots


Looking at interfaces definition - it is still using acient interface
names which are no longer in use. Has this installation been upgraded at
all? The interface name today should be encf5f0 today.

4	./sosreport-s8330025-20160224080320/etc/sysconfig/hardware/config-ccw-0.0.f5f0
0	./sosreport-s8330025-20160224080320/etc/sysconfig/hardware/config-ccw-0.0.eb4a

Are present, which means that this system is not upgraded to have latest
sysconfig-hardware package.

Your installation is really old, and thus is no longer supported, as
common with development series only up to date systems are supported.

Please upgrade your instance to latest packages, and try to reproduce
the problem. With new udev rules managed by chzdev interface bring up
should be more reliable.

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  network lost after large number of reboots

Status in Ubuntu on IBM z Systems:
Status in linux package in Ubuntu:

Bug description:
  ---Problem Description---
  network lost after large number of reboots (>500)
  Contact Information = pschmidt@xxxxxxxxxx 
  ---uname output---
  Linux s8330025 4.4.0-2-generic #16-Ubuntu SMP Thu Jan 28 15:44:18 UTC 2016 s390x s390x s390x GNU/Linux
  Machine Type = s390 z/VM Guest 
  ---Steps to Reproduce---
   reboot z/VM guest several times >500. After a large number of reboots the network interfaces doesn't come up any more. The z/VM guest boots fine, unless the missing network. Impossible to bring up network again manually.


  Further debug shows that it is the "ip link set enccw0.0.f5f0 up" that
  is failing with "RTNETLINK answers: Operation not permitted".  Looking
  for further debug assistance in determining why the CAP_NET_ADMIN
  check for the root user running ip might be failing.

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