It turned out that the following situation happened: A single OSA adapter is shared by multiple LPARs (in this case two) and in such a situation only one LPAR can bring it's (shared) OSA adapter into primary role.
"Bridge port roles Linux can assign a primary or secondary role to a logical port of an OSA or a HiperSockets adapter. Only one logical port of such an adapter can be assigned the primary role, but multiple other logical ports can be assigned secondary role. When one or more logical ports of an adapter are assigned primary or secondary role, the hardware ensures that exactly one of these ports is active. The active port receives frames with unknown destination. When a port with primary role is present, it always becomes active. When only ports with secondary role are present, the hardware decides which one becomes active. Changes in the ports' state are reported to Linux user space through udev events." 'Linux on Z and LinuxONE Device Drivers, Features, and Commands on Ubuntu Server 18.04 LTS' http://public.dhe.ibm.com/software/dw/linux390/docu/lub0dd01.pdf p.217 Hence closing that ticket by marking it as Invalid. ** Changed in: s390-tools (Ubuntu) Status: Confirmed => Invalid ** Changed in: ubuntu-z-systems Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1772461 Title: chzdev behaviour change in bionic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1772461/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
