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Oracle Linux: Kernel Reports "bond0: An illegal loopback occurred on adapter (enoX)" in /var/log/messages (Doc ID 2742974.1)

Last updated on AUGUST 26, 2021

Applies to:

Linux OS - Version Oracle Linux 7.7 with Unbreakable Enterprise Kernel [4.14.35] and later
Linux x86-64

Symptoms

Messages below being reported by the kernel:

kernel: [581060.901876] Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports
kernel: [581092.102522] bond0: An illegal loopback occurred on adapter (eno5)
kernel: [581092.102522] Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports
kernel: [581123.301155] bond0: An illegal loopback occurred on adapter (eno5)
kernel: [581123.301155] Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports
kernel: [581154.500793] bond0: An illegal loopback occurred on adapter (eno5)
kernel: [581154.500793] Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports
kernel: [581185.700523] bond0: An illegal loopback occurred on adapter (eno5)
kernel: [581185.700523] Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports

 

In this particular case, network interface uses MLX5 driver with below details:

 

Cause

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In this Document
Symptoms
Cause
Solution
References


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