rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10500 ticks this GP) idle=81e/1/0x4000000000000004 softirq=317827/317829 fqs=5250 rcu: (t=10502 jiffies g=420977 q=2554) NMI backtrace for cpu 1 CPU: 1 PID: 7639 Comm: syz-executor.0 Not tainted 4.19.71 #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:__list_del include/linux/list.h:105 [inline] RIP: 0010:__list_del_entry include/linux/list.h:120 [inline] RIP: 0010:__list_del_entry include/linux/list.h:115 [inline] RIP: 0010:list_move_tail include/linux/list.h:182 [inline] RIP: 0010:hhf_dequeue+0x5ff/0xa00 net/sched/sch_hhf.c:438 Code: 08 4c 8b 3b 48 89 fa 48 c1 ea 03 42 80 3c 22 00 0f 85 c3 03 00 00 49 8d 7f 08 4c 8b 73 08 48 89 fa 48 c1 ea 03 42 80 3c 22 00 <0f> 85 9f 03 00 00 4c 89 f2 4d 89 77 08 48 c1 ea 03 42 80 3c 22 00 RSP: 0018:ffff8880ae9074d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11011532ce7 RBX: ffff88808a996738 RCX: ffffffff858e8986 RDX: 1ffff11011532cfb RSI: ffffffff858e8990 RDI: ffff88808a9967d8 RBP: ffff8880ae907528 R08: ffff88808cb58600 R09: 000000000000000a R10: ffff88808cb59010 R11: 000000005e614b2b R12: dffffc0000000000 R13: ffff88808a996480 R14: ffff88808a9967d0 R15: ffff88808a9967d0 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 neigh_resolve_output net/core/neighbour.c:1369 [inline] neigh_resolve_output+0x5b7/0x980 net/core/neighbour.c:1349 neigh_output include/net/neighbour.h:501 [inline] ip6_finish_output2+0xb7f/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:__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 12 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 87 RSP: 0018:ffff88808aa279e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffea000208edc0 RCX: ffffffff81957336 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: ffff88808aa27b80 R08: ffff88808cb58600 R09: fffff94000411dbf R10: fffff94000411dbe R11: ffffea000208edf3 R12: ffffea000208edc8 R13: 80000000823b7007 R14: 0000000000000018 R15: ffffea000208edc0 dup_mmap kernel/fork.c:544 [inline] dup_mm kernel/fork.c:1283 [inline] copy_mm kernel/fork.c:1339 [inline] copy_process.part.0+0x543d/0x7a30 kernel/fork.c:1892 copy_process kernel/fork.c:1689 [inline] _do_fork+0x257/0xfd0 kernel/fork.c:2202 __do_sys_clone kernel/fork.c:2309 [inline] __se_sys_clone kernel/fork.c:2303 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2303 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457eba Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00 RSP: 002b:00007ffdd062cb80 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffdd062cb80 RCX: 0000000000457eba RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffdd062cbc0 R08: 0000000000000001 R09: 0000000001f1b940 R10: 0000000001f1bc10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffdd062cc10