rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=c21c/1/0x4000000000000000 softirq=48943/48944 fqs=88
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   826550          0            0
rcu: 	cputime:    20669      17764           30   ==> 38460(ms)
rcu: 	(t=10502 jiffies g=68157 q=479 ncpus=2)
CPU: 1 PID: 13314 Comm: syz.6.1936 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:neigh_alloc net/core/neighbour.c:501 [inline]
RIP: 0010:___neigh_create+0x75c/0x2440 net/core/neighbour.c:649
Code: 85 58 19 00 00 41 c7 87 80 00 00 00 00 00 00 00 48 8d 7b 28 48 c7 c6 80 22 a3 8b 48 c7 c2 80 b4 25 97 e8 b7 90 01 f9 4d 89 fd <4c> 8d bb 30 01 00 00 4c 8d b3 68 01 00 00 4c 89 f7 48 c7 c6 a0 22
RSP: 0018:ffffc900001f06a8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88805bd1e000 RCX: ffffffff96e9b401
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88805bd1e038
RBP: dffffc0000000000 R08: ffff88805bd1e057 R09: 0000000000000000
R10: ffff88805bd1e048 R11: ffffed100b7a3c0b R12: ffffffff8e0c8500
R13: ffff88805bd1e000 R14: ffff88805bd1e070 R15: ffff88805bd1e000
FS:  00007fdee78ea6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34223ffc CR3: 00000000257a2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff6 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ip6_finish_output2+0x159e/0x1650 net/ipv6/ip6_output.c:132
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xbed/0x14b0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2bc/0x600 net/ipv6/addrconf.c:4006
 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x52d/0x7d0 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+0xc7/0x190 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+0xa9/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 0a d9 1a f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e2 53 ea f6 65 8b 05 d3 9a 92 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90004befae0 EFLAGS: 00000206
RAX: 290ec8543594ed00 RBX: 0000000000000a06 RCX: 290ec8543594ed00
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001
RBP: ffffc90004befb60 R08: ffffffff8e4a212f R09: 1ffffffff1c94425
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888023cc4600 R15: 1ffff9200097df5c
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:522 [inline]
 try_to_wake_up+0x6f4/0x1140 kernel/sched/core.c:4232
 wake_up_process kernel/sched/core.c:4480 [inline]
 wake_up_q+0xb6/0x100 kernel/sched/core.c:1031
 futex_wake+0x40d/0x4b0 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+0x36f/0x3f0 kernel/futex/syscalls.c:192
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fdee698f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdee78ea0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fdee6be5fa8 RCX: 00007fdee698f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fdee6be5fac
RBP: 00007fdee6be5fa0 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdee6be6038 R14: 00007ffe650387a0 R15: 00007ffe65038888
 </TASK>