# modprobe -v macb
insmod /lib/modules/5.13.12-1-edge/kernel/drivers/net/phy/phylink.ko
insmod /lib/modules/5.13.12-1-edge/kernel/drivers/net/ethernet/cadence/macb.ko
[   93.843535] macb 10090000.ethernet: Registered clk switch 'sifive-gemgxl-mgmt'
[  365.582503] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[  365.587828] rcu: 	2-...0: (12 ticks this GP) idle=fd2/1/0x4000000000000000 softirq=780/782 fqs=3
[  365.596686] 	(detected by 3, t=12256 jiffies, g=185, q=6)
[  486.414502] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[  607.246501] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: