rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=96a/1/0x4000000000000004 softirq=45247/45250 fqs=5237 (t=10500 jiffies g=60401 q=1860) NMI backtrace for cpu 1 CPU: 1 PID: 21800 Comm: syz-executor.1 Not tainted 5.3.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __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_del_entry include/linux/list.h:134 [inline] RIP: 0010:__list_del_entry include/linux/list.h:129 [inline] RIP: 0010:list_move_tail include/linux/list.h:213 [inline] RIP: 0010:hhf_dequeue+0x5f7/0xa20 net/sched/sch_hhf.c:439 Code: bf 95 aa fb 45 84 f6 74 63 e8 75 94 aa fb 48 89 d8 48 c1 e8 03 42 80 3c 20 00 0f 85 f3 03 00 00 48 8d 7b 08 4c 8b 3b 48 89 fa <48> c1 ea 03 42 80 3c 22 00 0f 85 d0 03 00 00 49 8d 7f 08 4c 8b 73 RSP: 0000:ffff8880ae908de8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff1101276172f RBX: ffff888093b0b978 RCX: ffffffff85c7e0d1 RDX: ffff888093b0b980 RSI: ffffffff85c7e0db RDI: ffff888093b0b980 RBP: ffff8880ae908e38 R08: ffff88809afa8580 R09: fffffbfff14e9555 R10: ffff88809afa8f78 R11: ffff88809afa8580 R12: dffffc0000000000 R13: ffff888093b0b680 R14: 0000000000000001 R15: ffff888093b0ba10 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 br_dev_queue_push_xmit+0x3f3/0x5c0 net/bridge/br_forward.c:52 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] br_forward_finish+0xfa/0x400 net/bridge/br_forward.c:65 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] __br_forward+0x641/0xb00 net/bridge/br_forward.c:109 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:125 maybe_deliver+0x2c7/0x390 net/bridge/br_forward.c:181 br_flood+0x13a/0x3d0 net/bridge/br_forward.c:223 br_dev_xmit+0x98c/0x15a0 net/bridge/br_device.c:100 __netdev_start_xmit include/linux/netdevice.h:4419 [inline] netdev_start_xmit include/linux/netdevice.h:4433 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0x1a3/0x9c0 net/core/dev.c:3296 __dev_queue_xmit+0x2b15/0x3650 net/core/dev.c:3869 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] ndisc_send_skb+0xf29/0x1450 net/ipv6/ndisc.c:505 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:699 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3879 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 RIP: 0010:write_comp_data+0x1e/0x70 kernel/kcov.c:123 Code: 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 58 88 8f 7e a9 00 01 1f 00 75 51 41 8b 80 f0 12 00 00 <83> f8 03 75 45 49 8b 80 f8 12 00 00 45 8b 80 f4 12 00 00 4c 8b 08 RSP: 0000:ffff88805cc3fb30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff833e4e6e RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff88805cc3fb38 R08: ffff88809afa8580 R09: fffffbfff14e9541 R10: ffff88809afa8e38 R11: ffff88809afa8580 R12: 0000000000000001 R13: ffff8880a69b85f0 R14: 0000000000000001 R15: ffff88805cc3fc58 check_preemption_disabled lib/smp_processor_id.c:16 [inline] debug_smp_processor_id+0x2e/0x214 lib/smp_processor_id.c:57 rcu_dynticks_curr_cpu_in_eqs+0x17/0xb0 kernel/rcu/tree.c:298 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:894 rcu_read_lock include/linux/rcupdate.h:593 [inline] wb_get_create_current include/linux/backing-dev.h:301 [inline] balance_dirty_pages_ratelimited+0x1246/0x1f00 mm/page-writeback.c:1874 fault_dirty_shared_page.isra.0+0x14a/0x200 mm/memory.c:2244 do_shared_fault mm/memory.c:3561 [inline] do_fault mm/memory.c:3613 [inline] handle_pte_fault mm/memory.c:3840 [inline] __handle_mm_fault+0x2c38/0x3f20 mm/memory.c:3964 handle_mm_fault+0x1b5/0x6b0 mm/memory.c:4001 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: 0033:0x401aa7 Code: 00 00 00 48 83 ec 08 48 8b 15 0d ea 66 00 48 8b 05 fe e9 66 00 48 39 d0 48 8d 8a 00 00 00 01 72 17 48 39 c8 73 12 48 8d 50 04 <89> 38 48 89 15 e0 e9 66 00 48 83 c4 08 c3 48 89 c6 bf a8 9c 4c 00 RSP: 002b:00007ffcd82e89c0 EFLAGS: 00010287 RAX: 0000001b2dc20000 RBX: 0000000000000000 RCX: 0000001b2ec20000 RDX: 0000001b2dc20004 RSI: 00007ffcd82e8780 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcd82e8bb0 R14: 0000000000000000 R15: 00007ffcd82e8bc0