I'am using Cubieboard2. Todays morning i've got mistery "rcu: INFO: rcu_sched detected stalls on CPUs/tasks" with a complete failure of the entire network subsystem.
How it was:
Jul 13 09:12:36 hassio kernel: rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
Jul 13 09:12:37 hassio kernel: rcu: 1-...0: (21 ticks this GP) idle=a56/1/0x40000000 softirq=4946049/4946050 fqs=2286
Jul 13 09:12:37 hassio kernel: (detected by 0, t=5252 jiffies, g=11125849, q=117)
Jul 13 09:12:37 hassio kernel: Sending NMI from CPU 0 to CPUs 1:
Jul 13 09:13:13 hassio systemd[1]: systemd-udevd