Linux on IBM Z - VLAN device created on top of a bond reports only one slave present
Issue
A VLAN device on a two-slave active/backup bond intermittently reports only one slave present.
When the problem shows up intermittently after a reboot, there is a console message for the slave interface that subsequently fails to show up as a slave in the bond, like:
bondeth10g: Couldn't add bond vlan ids to encf300
Environment
- Red Hat Enterprise Linux 8
- kernel 4.18.0-147.3.1.el8_1.s390x but other kernel versions are likely to show the same problem
- IBM Z (mainframe) or IBM LinuxONE hardware
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