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[Frank Heimes <1618463@xxxxxxxxxxxxxxxxxx>]

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
       Status: New => Fix Committed

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Dimitri John Ledkov (xnox)

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https://bugs.launchpad.net/bugs/1618463

Title:
  udev race condition with qeth device and bridge_role

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in s390-tools package in Ubuntu:
  Fix Released
Status in s390-tools source package in Xenial:
  Fix Committed
Status in s390-tools source package in Yakkety:
  Fix Committed
Status in s390-tools source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * bridge_role property setting is racy on boot

   * This results in incorrect bridge mode set on the devices,
  sometimes, which leads to lack of desired connectivity (e.g. bridging
  internet to containers)

   * The fix for this issue is to set bridge_role, only after the device
  is online

   * Unfortunately the udev rules are not regenerated, therefore
  affected systemd must manually remove and recreate chzdev rules

  [Test Case]

   * Remove qeth udev rules from /etc/udev/rules.d/
   * Enable qeth device using chzdev with a non-default bridge_role setting, e.g.:
     chzdev --no-root-update -pVe c003 bridge_role=primary;
   * Reboot and check that bridge_role setting is correctly set in the sysfs, e.g.:
     /sys/devices/qeth/0.0.c003/bridge_role

  [Regression Potential]

   * Minimal, the generated udev rules remain the same; the only
  difference in the generated udev rules is the ordering in setting the
  bridge_role attribute

  [Other Info]
   
   * Original bug report:

  Attempting to set bridge_role = primary with the following command in
  preseed:

  in-target chzdev --no-root-update -pVe c003 bridge_role=primary;

  ...works, and generates the following udev rule for this device:

  https://pastebin.canonical.com/164271/

  However, after reboot:

  systemd-udevd[2634]: error opening
  ATTR{/sys/devices/qeth/0.0.c003/bridge_role} for writing: Permission
  denied

  More logging:

  https://pastebin.canonical.com/164272/

  after the system has booted, we are able to write to the file and set
  bridge_role to primary:

  root@10-13-3-10:/var/log# cat /sys/devices/qeth/0.0.c003/bridge_role
  none
  root@10-13-3-10:/var/log# echo primary > /sys/devices/qeth/0.0.c003/bridge_role
  root@10-13-3-10:/var/log# cat /sys/devices/qeth/0.0.c003/bridge_role
  primary

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