boot-time warning messages like: "sysfs: cannot create duplicate filename '/class/mdio_bus/ixgbe-...'"
Issue
- Machine eventually crashes on system shutdown or module ixgbe unload
- System log reports boot time sysfs WARNING messages like
[ 20.658238] WARNING: CPU: 6 PID: 461 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x64/0x80
[ 20.658240] sysfs: cannot create duplicate filename '/class/mdio_bus/ixgbe-mdio-0000:'
or
[ 171.741561] WARNING: CPU: 84 PID: 1834 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x64/0x80
[ 171.741562] sysfs: cannot create duplicate filename '/class/mdio_bus/ixgbe-c101'
Environment
- Red Hat Enterprise Linux 7.7 - 7.9
- multiple Intel network adapter cards in one system
- Intel® Ethernet Server Adapter X520 Series
- Intel® Ethernet Converged Network Adapter X540 Series
- Intel® Ethernet Converged Network Adapter X540-T1
- Intel® Ethernet Converged Network Adapter X540-T2
- Intel® Ethernet Converged Network Adapter X550 Series (Intel® Ethernet Controller X550 Series)
- Intel® Ethernet Converged Network Adapter X550-T1
- Intel® Ethernet Converged Network Adapter X550-T2
- HPE Ethernet 10Gb 2-port BASE-T/FLR-T X550-AT2 Adapter
- HPE Eth 10Gb 2P 562T or 562FLR-T
- possibly other similar families with MDIO feature using the ixgbe driver
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