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** Attachment added: "strace of ip link set enccw0.0.f5f0 up"
   https://bugs.launchpad.net/bugs/1552788/+attachment/4636564/+files/ip.up.strace.5030

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https://bugs.launchpad.net/bugs/1552788

Title:
  network lost after large number of reboots

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

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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