rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=e8e/1/0x4000000000000000 softirq=11353/11354 fqs=1286 (t=10500 jiffies g=10197 q=2293) NMI backtrace for cpu 1 CPU: 1 PID: 9909 Comm: syz-executor.2 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:49 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:__local_bh_enable_ip+0x5e/0x110 kernel/softirq.c:178 Code: 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 b7 00 00 00 8b 05 ff 28 bf 0b 85 c0 74 0b 65 8b 05 98 82 bd 7e 85 c0 74 53 9c 58 f6 c4 02 75 5a 65 8b 05 05 71 bd 7e 25 00 ff 00 00 3d 00 02 00 RSP: 0018:ffffc90000db0770 EFLAGS: 00000202 RAX: 0000000000000202 RBX: 0000000000000200 RCX: 1ffffffff1a074f3 RDX: 0000000000000000 RSI: 0000000000000200 RDI: ffffffff87bf7319 RBP: ffffffff87bf7319 R08: 00000000fffffffb R09: 0000000000000000 R10: ffffffff87bf770c R11: 0000000000000000 R12: ffff88806f799358 R13: ffff88806f799360 R14: dffffc0000000000 R15: ffff88806f7992b0 local_bh_enable include/linux/bottom_half.h:32 [inline] ip6t_do_table+0xbbe/0x1a50 net/ipv6/netfilter/ip6_tables.c:376 ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:52 [inline] ip6table_mangle_hook+0x399/0x7a0 net/ipv6/netfilter/ip6table_mangle.c:74 nf_hook_entry_hookfn include/linux/netfilter.h:136 [inline] nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:589 nf_hook include/linux/netfilter.h:256 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ndisc_send_skb+0xbb9/0x1750 net/ipv6/ndisc.c:508 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3874 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:lock_is_held_type+0xc2/0x100 kernel/locking/lockdep.c:5481 Code: 03 44 39 f0 41 0f 94 c4 48 c7 c7 80 ab 4b 89 e8 44 0b 00 00 b8 ff ff ff ff 65 0f c1 05 f7 d6 08 77 83 f8 01 75 23 ff 34 24 9d <48> 83 c4 08 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 e4 eb RSP: 0018:ffffc90016e9fcd8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff1a074f3 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffffff8b373860 R08: 0000000000000000 R09: ffffffff8d0375cf R10: fffffbfff1a06eb9 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888070b90988 R14: 00000000ffffffff R15: 0000000000000000 lock_is_held include/linux/lockdep.h:271 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:123 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x5c9/0x740 kernel/locking/lockdep.c:5408 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] setfl fs/fcntl.c:79 [inline] do_fcntl+0x696/0x1070 fs/fcntl.c:347 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:448 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdc1ea08c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffe81d78e4f R14: 00007fdc1ea099c0 R15: 000000000119bf8c