rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...0: (1 GPs behind) idle=a6e4/1/0x4000000000000000 softirq=3971/3972 fqs=5250
rcu: 	(detected by 1, t=10502 jiffies, g=2761, q=29 ncpus=2)
Sending NMI from CPU 1 to CPUs 0: