rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=3e2/1/0x4000000000000004 softirq=59818/59818 fqs=0 rcu: (t=10501 jiffies g=75893 q=250) rcu: rcu_preempt kthread starved for 10502 jiffies! g75893 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: 22605 Comm: blkid 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+0x4c/0x50 kernel/kcov.c:111 Code: d0 12 00 00 83 fa 02 75 20 48 8b 88 d8 12 00 00 8b 80 d4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d 0f 1f 00 65 4c 8b 04 25 40 ee 01 00 65 8b 05 e0 96 96 7e a9 00 RSP: 0018:ffff8880ae806f10 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: ffff88808270a540 RBX: ffff88808a70ebf8 RCX: ffffffff858e7e8e RDX: 0000000000000100 RSI: ffffffff858e7ea0 RDI: 0000000000000001 RBP: ffff8880ae806f68 R08: ffff88808270a540 R09: 0000000000000007 R10: ffff88808270aed8 R11: 0000000012cb7fb6 R12: dffffc0000000000 R13: ffff88808a70e940 R14: ffff88808a70ec98 R15: ffff88808a70ec90 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] ndisc_send_skb+0xf3b/0x1460 net/ipv6/ndisc.c:491 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3821 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:copyout+0x1/0x100 lib/iov_iter.c:134 Code: fe ff ff e8 d1 54 7f fe e9 13 fe ff ff e8 c7 54 7f fe e9 18 ff ff ff e8 bd 54 7f fe e9 98 fe ff ff 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 fc 53 48 89 d3 48 RSP: 0018:ffff888025487a00 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000029 RCX: 1ffffffff1161fa4 RDX: 0000000000000029 RSI: ffff8880a819d000 RDI: 0000000000caeee8 RBP: ffff888025487a78 R08: ffff88808270a540 R09: 0000000000000000 R10: ffff88808270adc0 R11: ffffffff89e8d6e8 R12: ffff888025487d48 R13: ffff888025487cd8 R14: 0000000000000000 R15: 0000000000caeee8 generic_file_buffered_read mm/filemap.c:2207 [inline] generic_file_read_iter+0x97e/0x2ac0 mm/filemap.c:2384 blkdev_read_iter+0x120/0x190 fs/block_dev.c:1944 call_read_iter include/linux/fs.h:1814 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x584/0x800 fs/read_write.c:418 vfs_read+0x194/0x3d0 fs/read_write.c:452 ksys_read+0x14f/0x2d0 fs/read_write.c:579 __do_sys_read fs/read_write.c:589 [inline] __se_sys_read fs/read_write.c:587 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:587 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb8cedde310 Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 RSP: 002b:00007ffef5e91918 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000007a000 RCX: 00007fb8cedde310 RDX: 0000000000000029 RSI: 0000000000caeee8 RDI: 0000000000000003 RBP: 0000000000caeec0 R08: 0000000000000058 R09: 0101010101010101 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000ca8030 R13: 0000000000000029 R14: 0000000000ca8080 R15: 0000000000caeed8