rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10432 ticks this GP) idle=6674/1/0x4000000000000000 softirq=30232/30238 fqs=3522
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1779676         12            0
rcu: 	cputime:    19249      33239           33   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=36521 q=2589 ncpus=2)
CPU: 1 PID: 10272 Comm: syz.3.1468 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:nf_nat_ipv6_fn+0x227/0x2e0 net/netfilter/nf_nat_proto.c:938
Code: eb 16 e8 8c 37 c2 f8 eb 0f e8 85 37 c2 f8 49 be 00 00 00 00 00 fc ff df 48 8b 7c 24 18 48 89 de 48 8b 54 24 08 e8 99 6a ff ff <43> c6 44 35 06 f8 43 c6 44 35 04 f8 48 c7 44 24 20 0e 36 e0 45 4b
RSP: 0018:ffffc900001f07a0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888024b94500 RCX: ffff888025a4bc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001f0858 R08: ffff888025a4bc00 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000100 R12: 0000000000000007
R13: 1ffff9200003e0f8 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f32060556c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000002db73000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 nf_nat_ipv6_local_fn+0x2e/0x390 net/netfilter/nf_nat_proto.c:1001
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:259 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0x138a/0x14f0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 1b 79 ce f6 65 8b 05 ec af 75 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9001047fac0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 8b5d8a2bcc044e00
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: 0000000000000001
RBP: ffffc9001047fb50 R08: ffffffff8e8add6f R09: 1ffffffff1d15bad
R10: dffffc0000000000 R11: fffffbfff1d15bae R12: dffffc0000000000
R13: ffff8880b8f3cd58 R14: ffff888025a48a00 R15: 1ffff9200208ff58
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:522 [inline]
 try_to_wake_up+0x70a/0x1190 kernel/sched/core.c:4233
 wake_up_process kernel/sched/core.c:4481 [inline]
 wake_up_q+0xb6/0x100 kernel/sched/core.c:1032
 futex_wake+0x42a/0x4f0 kernel/futex/waitwake.c:184
 do_futex+0x35d/0x3e0 kernel/futex/syscalls.c:139
 __do_sys_futex kernel/futex/syscalls.c:211 [inline]
 __se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f320519c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f32060550e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f3205415fa8 RCX: 00007f320519c629
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3205415fac
RBP: 00007f3205415fa0 R08: 0000000000745ac3 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3205416038 R14: 00007ffd34f97780 R15: 00007ffd34f97868
 </TASK>