rcu stall on cpu some time after cpuidle_enter_s2idle()

most of the time I see something like the following after it resumed:

[  665.197214] rcu: INFO: rcu_preempt self-detected stall on CPU
[  665.197387] rcu: 	0-...!: (3 ticks this GP) idle=d81/1/0x4000000000000004 softirq=12675/12677 fqs=0 
[  665.197463] 	(t=6321 jiffies g=19473 q=2)
[  665.197498] rcu: rcu_preempt kthread timer wakeup didn't happen for 6320 jiffies! g19473 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
[  665.197512] rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3725
[  665.197526] rcu: rcu_preempt kthread starved for 6321 jiffies! g19473 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
[  665.197543] rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
[  665.197550] rcu: RCU grace-period kthread stack dump:
[  665.197571] task:rcu_preempt     state:R  running task     stack:    0 pid:   13 ppid:     2 flags:0x00000008
[  665.197646] Call trace:
[  665.197656]  __switch_to+0x138/0x190
[  665.197867]  __schedule+0x288/0x6ec
[  665.197944]  schedule+0x7c/0x110
[  665.197963]  schedule_timeout+0xa4/0x1c4
[  665.197997]  rcu_gp_fqs_loop+0x13c/0x51c
[  665.198042]  rcu_gp_kthread+0x1a4/0x264
[  665.198055]  kthread+0x15c/0x170
[  665.198086]  ret_from_fork+0x10/0x20
[  665.198121] rcu: Stack dump where RCU GP kthread last ran:
[  665.198132] Task dump for CPU 1:
[  665.198145] task:kworker/u8:22   state:R  running task     stack:    0 pid: 1707 ppid:     2 flags:0x00000008
[  665.198197] Workqueue: writeback wb_workfn (flush-179:0)
[  665.198279] Call trace:
[  665.198284]  __switch_to+0x138/0x190
[  665.198298]  0xffff0000093a2d00
[  665.198388] Task dump for CPU 0:
[  665.198395] task:swapper/0       state:R  running task     stack:    0 pid:    0 ppid:     0 flags:0x0000000a
[  665.198420] Call trace:
[  665.198427]  dump_backtrace+0x0/0x1e4
[  665.198446]  show_stack+0x24/0x30
[  665.198464]  sched_show_task+0x15c/0x180
[  665.198526]  dump_cpu_task+0x50/0x60
[  665.198575]  rcu_dump_cpu_stacks+0xf4/0x138
[  665.198591]  rcu_sched_clock_irq+0xb78/0xf04
[  665.198621]  update_process_times+0xa8/0xf4
[  665.198695]  tick_sched_handle+0x3c/0x60
[  665.198728]  tick_sched_timer+0x58/0xb0
[  665.198736]  __hrtimer_run_queues+0x18c/0x370
[  665.198754]  hrtimer_interrupt+0xf4/0x250
[  665.198767]  arch_timer_handler_phys+0x40/0x50
[  665.198837]  handle_percpu_devid_irq+0x94/0x250
[  665.198887]  handle_domain_irq+0x6c/0xa0
[  665.198903]  gic_handle_irq+0xc4/0x144
[  665.198925]  call_on_irq_stack+0x2c/0x54
[  665.198955]  do_interrupt_handler+0x5c/0x70
[  665.198962]  el1_interrupt+0x30/0x80
[  665.198995]  el1h_64_irq_handler+0x18/0x24
[  665.199011]  el1h_64_irq+0x78/0x7c
[  665.199018]  cpuidle_enter_s2idle+0x14c/0x1ac
[  665.199092]  do_idle+0x25c/0x2a0
[  665.199145]  cpu_startup_entry+0x34/0x80
[  665.199153]  rest_init+0xec/0x100
[  665.199172]  arch_call_rest_init+0x1c/0x28
[  665.199244]  start_kernel+0x6e0/0x720
[  665.199256]  __primary_switched+0xc0/0xc8