rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=22e/0/0x3 softirq=7584/7585 fqs=0 (t=10502 jiffies g=6861 q=134) rcu: rcu_preempt kthread starved for 10503 jiffies! g6861 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:28776 pid: 13 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8de/0x2170 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 schedule_timeout+0x11b/0x210 kernel/time/timer.c:1878 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline] rcu_gp_kthread+0xbbe/0x1d90 kernel/rcu/tree.c:2113 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x9a/0xcc lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580 update_process_times+0x13b/0x1c0 kernel/time/timer.c:1782 tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:226 tick_sched_timer+0x132/0x210 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x18a/0xb00 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x300/0x930 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:debug_lockdep_rcu_enabled+0x0/0x30 kernel/rcu/update.c:278 Code: cc cc cc cc cc cc cc cc cc cc 65 81 05 25 2d d2 77 00 00 00 10 c3 0f 1f 40 00 65 81 05 15 2d d2 77 00 00 00 f0 c3 cc cc cc cc <8b> 05 0e 55 01 04 85 c0 74 21 8b 05 dc 85 01 04 85 c0 74 17 65 48 RSP: 0018:ffffc90000db0138 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff88801899ac00 RCX: 1ffffd1ffffa7712 RDX: 1ffff1100313359f RSI: ffffffff88ddc540 RDI: ffff88801899acf8 RBP: ffff88802234aa00 R08: 0000000000000006 R09: ffffffff8bdfccc3 R10: fffffbfff17bf998 R11: 0000000000000000 R12: ffff88801e904400 R13: ffff88802234aa28 R14: 1ffff920001b6035 R15: 0000000000000006 tcf_police_act+0x2e2/0xfe0 net/sched/act_police.c:228 tcf_action_exec net/sched/act_api.c:724 [inline] tcf_action_exec+0xf5/0x3a0 net/sched/act_api.c:704 tcf_exts_exec include/net/pkt_cls.h:323 [inline] route4_classify+0xb75/0x1030 net/sched/cls_route.c:179 __tcf_classify+0xe2/0x380 net/sched/cls_api.c:1548 tcf_classify+0x6c/0x90 net/sched/cls_api.c:1585 prio_classify net/sched/sch_prio.c:42 [inline] prio_enqueue+0x310/0x620 net/sched/sch_prio.c:75 __dev_xmit_skb net/core/dev.c:3807 [inline] __dev_queue_xmit+0x137a/0x2670 net/core/dev.c:4119 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0xb56/0x1d50 net/ipv4/ip_output.c:230 iptunnel_xmit+0x533/0x970 net/ipv4/ip_tunnel_core.c:82 geneve_xmit_skb drivers/net/geneve.c:959 [inline] geneve_xmit+0xc1e/0x28e0 drivers/net/geneve.c:1059 __netdev_start_xmit include/linux/netdevice.h:4778 [inline] netdev_start_xmit include/linux/netdevice.h:4792 [inline] xmit_one net/core/dev.c:3574 [inline] dev_hard_start_xmit+0x1a5/0x6f0 net/core/dev.c:3590 __dev_queue_xmit+0x1a94/0x2670 net/core/dev.c:4151 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0x514/0x1480 net/ipv6/ip6_output.c:117 dst_output include/net/dst.h:441 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] mld_sendpack+0x7f8/0xbc0 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x4c7/0xc60 net/ipv6/mcast.c:2474 call_timer_fn+0x163/0x4b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x52a/0x8b0 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1744 __do_softirq+0x29b/0x9f6 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:169 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline] RIP: 0010:acpi_idle_do_entry+0x161/0x1c0 drivers/acpi/processor_idle.c:516 Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 6d 48 8b 45 00 a8 08 75 c9 e8 8d 19 3a f9 e9 07 00 00 00 0f 00 2d a1 6c b4 00 fb f4 <9c> 58 fa f6 c4 02 74 ae 5d e9 e1 15 3a f9 48 89 ef 5d e9 c8 f9 ff RSP: 0018:ffffc90000d47d30 EFLAGS: 00000202 RAX: 000000000003b5fb RBX: ffff88801680a065 RCX: 1ffffffff1863dd1 RDX: 0000000000000000 RSI: ffffffff888afa60 RDI: ffffffff88ddc5c0 RBP: ffff8880101d3800 R08: 0000000000000001 R09: 0000000000000001 R10: ffffed100203a700 R11: 0000000000000001 R12: 0000000000000001 R13: ffff88801680a064 R14: ffffffff8b09e260 R15: ffff888141784004 acpi_idle_enter+0x2c0/0x4b0 drivers/acpi/processor_idle.c:647 cpuidle_enter_state+0x152/0xb40 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x45/0xa0 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x3e1/0x590 kernel/sched/idle.c:299 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396 start_secondary+0x274/0x350 arch/x86/kernel/smpboot.c:272 secondary_startup_64_no_verify+0xb0/0xbb ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: cc int3 8: cc int3 9: cc int3 a: 65 81 05 25 2d d2 77 addl $0x10000000,%gs:0x77d22d25(%rip) # 0x77d22d3a 11: 00 00 00 10 15: c3 retq 16: 0f 1f 40 00 nopl 0x0(%rax) 1a: 65 81 05 15 2d d2 77 addl $0xf0000000,%gs:0x77d22d15(%rip) # 0x77d22d3a 21: 00 00 00 f0 25: c3 retq 26: cc int3 27: cc int3 28: cc int3 29: cc int3 * 2a: 8b 05 0e 55 01 04 mov 0x401550e(%rip),%eax # 0x401553e <-- trapping instruction 30: 85 c0 test %eax,%eax 32: 74 21 je 0x55 34: 8b 05 dc 85 01 04 mov 0x40185dc(%rip),%eax # 0x4018616 3a: 85 c0 test %eax,%eax 3c: 74 17 je 0x55 3e: 65 gs 3f: 48 rex.W