rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=76e/1/0x4000000000000004 softirq=25945/25945 fqs=0 (t=10501 jiffies g=36121 q=1016) rcu: rcu_preempt kthread starved for 10502 jiffies! g36121 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I29112 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline] rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 8776 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2736 [inline] rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:__list_add_valid+0x23/0xa0 lib/list_debug.c:23 Code: 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 49 89 fd 48 8d 7a 08 41 54 49 89 d4 48 89 fa 48 83 ec 08 <48> c1 ea 03 80 3c 02 00 75 52 49 8b 54 24 08 48 39 f2 0f 85 5a 01 RSP: 0000:ffff8880ae809510 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff88809737be38 RCX: ffffffff85c7e0d1 RDX: ffff88809737bed8 RSI: ffff88809737bed0 RDI: ffff88809737bed8 RBP: ffff8880ae809528 R08: ffff8880a4c2e180 R09: fffffbfff14e9555 R10: ffff8880a4c2eb28 R11: ffff8880a4c2e180 R12: ffff88809737bed0 R13: ffff88809737be38 R14: ffff88809737bed8 R15: ffff88809737bed0 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] list_move_tail include/linux/list.h:214 [inline] hhf_dequeue+0x66d/0xa20 net/sched/sch_hhf.c:439 dequeue_skb net/sched/sch_generic.c:258 [inline] qdisc_restart net/sched/sch_generic.c:361 [inline] __qdisc_run+0x1e7/0x19d0 net/sched/sch_generic.c:379 __dev_xmit_skb net/core/dev.c:3533 [inline] __dev_queue_xmit+0x16f1/0x3650 net/core/dev.c:3838 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902 neigh_resolve_output net/core/neighbour.c:1490 [inline] neigh_resolve_output+0x5a5/0x970 net/core/neighbour.c:1470 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x1034/0x2520 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xa50 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] mld_sendpack+0x9c7/0xea0 net/ipv6/mcast.c:1682 mld_send_cr net/ipv6/mcast.c:1978 [inline] mld_ifc_timer_expire+0x449/0x8a0 net/ipv6/mcast.c:2477 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 </IRQ> RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:943 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0x7e/0x130 kernel/rcu/tree.c:933 Code: 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 9d 00 00 00 48 03 1c c5 40 d1 bc 88 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa <48> c1 ea 03 80 3c 02 00 0f 85 88 00 00 00 48 8d 7b 20 4c 8b 63 18 RSP: 0000:ffff88809365fdf0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8880ae8365c0 RCX: 1ffffffff1179a28 RDX: ffff8880ae8365d8 RSI: ffffffff833e4e7c RDI: ffff8880ae8365d8 RBP: ffff88809365fe08 R08: ffff8880a4c2e180 R09: ffffed1015d06cd4 R10: ffffed1015d06cd3 R11: ffff8880ae83669b R12: ffff88808ccc6180 R13: 0000000000000014 R14: 000000c426784b20 R15: ffff8880a81654a0 rcu_read_lock_held+0x8a/0xd0 kernel/rcu/update.c:268 count_memcg_event_mm+0x248/0x3f0 include/linux/memcontrol.h:743 handle_mm_fault+0xc5/0x6b0 mm/memory.c:3981 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x536/0xdd0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x590 arch/x86/mm/fault.c:1530 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1202 RIP: 0033:0x4da112 Code: cc cc cc cc cc cc cc cc 48 83 ec 08 48 89 2c 24 48 8d 2c 24 48 8b 42 20 48 8b 4a 10 48 8b 52 08 48 8b 5c 24 10 48 39 cb 73 17 <48> 8b 0c da 48 39 c1 0f 9d c0 88 44 24 18 48 8b 2c 24 48 83 c4 08 RSP: 002b:000000c42e5c3cc0 EFLAGS: 00010293 RAX: 00000000000068d6 RBX: 0000000000000564 RCX: 0000000000000ac9 RDX: 000000c426782000 RSI: 00000000004da0f0 RDI: 0000000000000b58 RBP: 000000c42e5c3cc0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000009c6f56 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000004