rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 ticks this GP) idle=0e6/1/0x4000000000000002 softirq=257738/257738 fqs=0 rcu: (t=11181 jiffies g=390737 q=184) rcu: rcu_preempt kthread starved for 11181 jiffies! g390737 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt I25848 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 schedule+0xfe/0x350 kernel/sched/core.c:3516 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1803 rcu_gp_fqs_loop+0x6ba/0x970 kernel/rcu/tree.c:1948 rcu_gp_kthread+0x2bb/0xc10 kernel/rcu/tree.c:2105 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 7421 Comm: kworker/1:2 Not tainted 5.0.0-rc3 #36 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: rcu_gp process_srcu Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1211 print_cpu_stall.cold+0x227/0x40c kernel/rcu/tree.c:1348 check_cpu_stall kernel/rcu/tree.c:1422 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks+0xb32/0x1380 kernel/rcu/tree.c:2521 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x3a7/0x1050 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:preempt_count_sub+0x18/0x160 kernel/sched/core.c:3212 Code: ff e9 27 fd ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 c7 c0 20 8a 56 8b 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 89 e5 <53> 83 e0 07 48 c1 e9 03 83 c0 03 89 fb 0f b6 14 11 38 d0 7c 08 84 RSP: 0018:ffff88809b107590 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8b568a20 RBX: 000005fc93e99103 RCX: ffffffff8b568a20 RDX: dffffc0000000000 RSI: ffffffff8390f388 RDI: 0000000000000001 RBP: ffff88809b107590 R08: ffff88804d4e8280 R09: fffffbfff13481e1 R10: ffff88809b107710 R11: ffffffff89a40f07 R12: 000005fc93e9736d R13: 0000000000000001 R14: 0000000000002ced R15: ffffffff89a40b60 delay_tsc+0x6b/0xc0 arch/x86/lib/delay.c:66 __delay arch/x86/lib/delay.c:161 [inline] __const_udelay+0x5f/0x80 arch/x86/lib/delay.c:175 try_check_zero+0x352/0x5c0 kernel/rcu/srcutree.c:730 srcu_advance_state kernel/rcu/srcutree.c:1167 [inline] process_srcu+0x642/0x1400 kernel/rcu/srcutree.c:1261 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352