rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (1 GPs behind) idle=1f84/1/0x4000000000000000 softirq=4181/4182 fqs=5249
rcu: 	(detected by 0, t=10502 jiffies, g=3097, q=61 ncpus=2)
Sending NMI from CPU 0 to CPUs 1: