rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10515 ticks this GP) idle=d96/1/0x4000000000000004 softirq=9945/9947 fqs=5250 (t=10502 jiffies g=9257 q=1457) NMI backtrace for cpu 0 CPU: 0 PID: 9527 Comm: syz-executor.4 Not tainted 5.3.0-rc8+ #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+0x1d8/0x2f8 lib/dump_stack.c:113 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 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+0xb95/0x16d0 kernel/rcu/tree.c:2183 update_process_times+0x134/0x190 kernel/time/timer.c:1639 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x403/0x850 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:__write_once_size include/linux/compiler.h:226 [inline] RIP: 0010:__list_add include/linux/list.h:66 [inline] RIP: 0010:list_add_tail include/linux/list.h:93 [inline] RIP: 0010:list_move_tail include/linux/list.h:214 [inline] RIP: 0010:hhf_dequeue+0x5a9/0xaa0 net/sched/sch_hhf.c:439 Code: 03 42 80 3c 20 00 74 05 e8 94 27 a0 fb 4c 89 73 08 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 7a 27 a0 fb 49 89 1e 06 fb ff ff e8 7d 2b 67 fb e9 fc fa ff ff e8 73 2b 67 fb 48 8b RSP: 0018:ffff8880aea09700 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11014fffb4a RBX: ffff8880a7ffd9b8 RCX: ffff888058916300 RDX: 0000000000000502 RSI: ffff8880a7ffda50 RDI: ffff8880a7ffd9c0 RBP: ffff8880aea097a8 R08: ffffffff860c5d6a R09: 0000000000000000 R10: fffffbfff117be8d R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880a7ffd6c0 R14: ffff8880a7ffda50 R15: ffff8880a7ffda40 dequeue_skb net/sched/sch_generic.c:258 [inline] qdisc_restart net/sched/sch_generic.c:361 [inline] __qdisc_run+0x217/0x1b30 net/sched/sch_generic.c:379 __dev_xmit_skb net/core/dev.c:3533 [inline] __dev_queue_xmit+0x1161/0x3020 net/core/dev.c:3838 dev_queue_xmit+0x17/0x20 net/core/dev.c:3902 neigh_hh_output include/net/neighbour.h:500 [inline] neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0xff2/0x13d0 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x693/0x910 net/ipv6/ip6_output.c:142 ip6_finish_output+0x52/0x1e0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x26f/0x390 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+0xa35/0xe40 net/ipv6/ndisc.c:504 ndisc_send_rs+0x4ec/0x680 net/ipv6/ndisc.c:698 addrconf_rs_timer+0x22e/0x5f0 net/ipv6/addrconf.c:3879 call_timer_fn+0x95/0x170 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers+0x79e/0x970 kernel/time/timer.c:1685 run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1698 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xad/0xe0 kernel/locking/spinlock.c:191 Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 80 87 8a 88 e8 92 95 30 fa 48 83 3d 7a 94 0e 01 00 74 2d 4c 89 f7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 54 90 d4 f9 65 8b 05 a9 0a 86 78 RSP: 0018:ffff8880589279f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11150f0 RBX: ffff8880902a8880 RCX: dffffc0000000000 RDX: ffffc9000eba3000 RSI: 000000000003ffff RDI: 0000000000000286 RBP: ffff888058927a00 R08: ffffffff81790e74 R09: ffffed1012055111 R10: ffffed1012055111 R11: 0000000000000000 R12: 0000000000000286 R13: 0000000000000001 R14: 0000000000000286 R15: 0000000000000001 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline] __wake_up_common_lock kernel/sched/wait.c:125 [inline] __wake_up+0xe1/0x150 kernel/sched/wait.c:142 wakeup_pipe_writers fs/splice.c:457 [inline] splice_from_pipe_next+0x2c0/0x460 fs/splice.c:560 __splice_from_pipe+0x127/0x8a0 fs/splice.c:622 vmsplice_to_user fs/splice.c:1272 [inline] do_vmsplice+0x1d4/0xdf0 fs/splice.c:1350 __do_sys_vmsplice fs/splice.c:1371 [inline] __se_sys_vmsplice+0x165/0x220 fs/splice.c:1353 __x64_sys_vmsplice+0x9b/0xb0 fs/splice.c:1353 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598e9 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff32d911c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000116 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004598e9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000008 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff32d9126d4 R13: 00000000004c90c8 R14: 00000000004e0338 R15: 00000000ffffffff