rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=926/1/0x4000000000000004 softirq=46104/46104 fqs=5143 rcu: (t=10500 jiffies g=46869 q=22638) NMI backtrace for cpu 0 CPU: 0 PID: 7538 Comm: udevd 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+0x0/0x50 kernel/kcov.c:94 Code: 41 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 RSP: 0018:ffff8880ae806ae0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000301 RBX: ffff88809bd222b8 RCX: ffffffff858e7e8e RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff8880ae806b38 R08: ffff8880a1a68680 R09: 0000000000000006 R10: ffff8880a1a68ff0 R11: 000000006419e53e R12: dffffc0000000000 R13: ffff88809bd22000 R14: ffff88809bd22358 R15: ffff88809bd22350 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 br_nf_dev_queue_xmit+0x365/0x1610 net/bridge/br_netfilter_hooks.c:779 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] br_nf_post_routing+0x76f/0x12f0 net/bridge/br_netfilter_hooks.c:825 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] br_forward_finish+0x215/0x400 net/bridge/br_forward.c:69 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1008 br_nf_forward_finish+0x356/0x700 net/bridge/br_netfilter_hooks.c:553 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] br_nf_forward_ip net/bridge/br_netfilter_hooks.c:620 [inline] br_nf_forward_ip+0x6b4/0x17c0 net/bridge/br_netfilter_hooks.c:564 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] __br_forward+0x393/0xb30 net/bridge/br_forward.c:113 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:129 br_flood+0x5fa/0x710 net/bridge/br_forward.c:238 br_handle_frame_finish+0xf72/0x1510 net/bridge/br_input.c:167 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1008 br_nf_pre_routing_finish_ipv6+0x6ed/0xd70 net/bridge/br_netfilter_ipv6.c:210 NF_HOOK include/linux/netfilter.h:289 [inline] br_nf_pre_routing_ipv6+0x4a5/0x8ca net/bridge/br_netfilter_ipv6.c:240 br_nf_pre_routing+0x1016/0x159c net/bridge/br_netfilter_hooks.c:494 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] br_handle_frame+0x985/0x1480 net/bridge/br_input.c:306 __netif_receive_skb_core+0xac1/0x3570 net/core/dev.c:4861 __netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:4930 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5044 process_backlog+0x23a/0x7a0 net/core/dev.c:5855 napi_poll net/core/dev.c:6278 [inline] net_rx_action+0x4f5/0x1070 net/core/dev.c:6344 __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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:slab_alloc mm/slab.c:3390 [inline] RIP: 0010:kmem_cache_alloc+0x287/0x700 mm/slab.c:3557 Code: 7e 0f 85 db fe ff ff e8 38 d6 5e ff e9 d1 fe ff ff e8 7d ff ce ff 48 83 3d 4d b5 d0 06 00 0f 84 27 03 00 00 48 8b 7d d0 57 9d <0f> 1f 44 00 00 e9 64 fe ff ff 31 d2 be a6 01 00 00 48 c7 c7 32 cf RSP: 0018:ffff888075f2fca8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 00000000006000c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff888075f2fd10 R08: ffff8880a1a68680 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888051c6e140 R13: ffff88821bc47980 R14: 00000000006000c0 R15: ffff88821bc47980 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 user_path_at_empty+0x2f/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] do_utimes+0x1ce/0x350 fs/utimes.c:152 __do_sys_utimensat fs/utimes.c:184 [inline] __se_sys_utimensat fs/utimes.c:168 [inline] __x64_sys_utimensat+0x19d/0x260 fs/utimes.c:168 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0222292a32 Code: 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 48 85 f6 74 2b 4c 63 d1 48 63 ff b8 18 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 f3 c3 48 8b 15 d5 33 2b 00 f7 d8 64 89 02 RSP: 002b:00007fff401a3af8 EFLAGS: 00000202 ORIG_RAX: 0000000000000118 RAX: ffffffffffffffda RBX: 000000000109c070 RCX: 00007f0222292a32 RDX: 0000000000000000 RSI: 000000000109c070 RDI: ffffffffffffff9c RBP: 0000000000fbb030 R08: 0000000000000006 R09: 00007f02222e73d0 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000063b0 R13: 0000000000000702 R14: 0000000000000000 R15: 0000000000000000