rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=fbe/1/0x4000000000000004 softirq=10547/10547 fqs=0 rcu: (t=10500 jiffies g=5145 q=301) rcu: rcu_preempt kthread starved for 10500 jiffies! g5145 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I29104 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3474 schedule+0x92/0x1c0 kernel/sched/core.c:3518 schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1804 rcu_gp_kthread+0xd5c/0x2190 kernel/rcu/tree.c:2202 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 0 CPU: 0 PID: 7572 Comm: syz-executor655 Not tainted 4.19.72 #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+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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+0x189/0x1d5 kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682 update_process_times+0x32/0x80 kernel/time/timer.c:1636 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:94 Code: bc f4 ff ff ff e8 33 66 ea ff 48 c7 05 44 22 cd 08 00 00 00 00 e9 ca e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 28 97 96 RSP: 0000:ffff8880ae806fb8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: ffff888088c3dda8 RBX: ffff888088c3ddb8 RCX: ffffffff858e78e9 RDX: ffff888088c3dd80 RSI: ffffffff858e7d4c RDI: 0000000000000005 RBP: ffff8880ae807018 R08: ffff888078d7c280 R09: 0000000000000008 R10: ffff888078d7cc40 R11: 00000000f99cb6a6 R12: dffffc0000000000 R13: ffff888088c3db00 R14: 0000000000000001 R15: 0000000000000000 dequeue_skb net/sched/sch_generic.c:277 [inline] qdisc_restart net/sched/sch_generic.c:380 [inline] __qdisc_run+0x1e7/0x1960 net/sched/sch_generic.c:398 __dev_xmit_skb net/core/dev.c:3501 [inline] __dev_queue_xmit+0x165c/0x2fe0 net/core/dev.c:3811 dev_queue_xmit+0x18/0x20 net/core/dev.c:3876 br_dev_queue_push_xmit+0x405/0x5d0 net/bridge/br_forward.c:56 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] br_forward_finish+0xfa/0x400 net/bridge/br_forward.c:69 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] __br_forward+0x647/0xb30 net/bridge/br_forward.c:113 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:129 maybe_deliver net/bridge/br_forward.c:184 [inline] maybe_deliver net/bridge/br_forward.c:172 [inline] br_flood+0x4da/0x710 net/bridge/br_forward.c:226 br_dev_xmit+0xeeb/0x1490 net/bridge/br_device.c:103 __netdev_start_xmit include/linux/netdevice.h:4303 [inline] netdev_start_xmit include/linux/netdevice.h:4312 [inline] xmit_one net/core/dev.c:3257 [inline] dev_hard_start_xmit+0x1a5/0x980 net/core/dev.c:3273 __dev_queue_xmit+0x2704/0x2fe0 net/core/dev.c:3843 dev_queue_xmit+0x18/0x20 net/core/dev.c:3876 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip6_finish_output2+0x12fd/0x2550 net/ipv6/ip6_output.c:120 ip6_finish_output+0x574/0xbe0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:447 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] mld_sendpack+0x9d3/0xeb0 net/ipv6/mcast.c:1684 mld_send_cr net/ipv6/mcast.c:1980 [inline] mld_ifc_timer_expire+0x449/0x8a0 net/ipv6/mcast.c:2479 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1682 [inline] __run_timers kernel/time/timer.c:1650 [inline] run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1695 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:48 Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 aa c3 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 RSP: 0000:ffff8880981cfb10 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff888000000000 RCX: 0000000000000f80 RDX: 1ffff1100f1afab5 RSI: ffffffff81944d66 RDI: ffff8880868e8080 RBP: ffff8880981cfb28 R08: ffff888078d7c280 R09: 0000000000000000 R10: ffffed1015d04732 R11: ffff8880ae823993 R12: ffff888078d7c280 R13: 00000000000000e8 R14: 0000000000000000 R15: 0000000000000000 process_huge_page mm/memory.c:4669 [inline] clear_huge_page+0xb5/0x4d0 mm/memory.c:4729 __do_huge_pmd_anonymous_page mm/huge_memory.c:568 [inline] do_huge_pmd_anonymous_page+0x757/0x14e0 mm/huge_memory.c:726 create_huge_pmd mm/memory.c:3932 [inline] __handle_mm_fault+0x2c80/0x3f80 mm/memory.c:4136 handle_mm_fault+0x1b5/0x690 mm/memory.c:4202 __do_page_fault+0x62a/0xe90 arch/x86/mm/fault.c:1390 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1465 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1204 RIP: 0033:0x401a4f Code: bf 29 00 00 00 e8 51 09 04 00 48 83 f8 ff 74 07 48 89 05 5c 16 2d 00 48 8b 05 9d 7a 0a 00 48 8b 35 4e 16 2d 00 b9 00 06 00 20 04 25 10 06 00 20 00 00 00 00 ba 33 89 00 00 bf 10 00 00 00 48 RSP: 002b:00007ffd5d6ca070 EFLAGS: 00010217 RAX: 735f656764697262 RBX: 0000000000000000 RCX: 0000000020000600 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000002 RBP: 0000000000038ed0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004032f0 R14: 0000000000000000 R15: 0000000000000000