rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=a8d/1/0x4000000000000000 softirq=15236/15237 fqs=4008 
	(t=10502 jiffies g=19321 q=5131)
NMI backtrace for cpu 0
CPU: 0 PID: 6411 Comm: syz.3.419 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22d/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31f/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6ec/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__in6_dev_get include/net/addrconf.h:321 [inline]
RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:420 [inline]
RIP: 0010:find_match+0xa8/0xc20 net/ipv6/route.c:744
Code: fc ff df 42 80 7c 25 00 00 74 08 48 89 df e8 af cd 19 f9 48 89 d8 bb 60 03 00 00 48 03 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 8e cd 19 f9 48 8b 1b e8 f6 09 1c 01 41 89 c4 31
RSP: 0018:ffffc90000007208 EFLAGS: 00000246
RAX: 1ffff11003d9886c RBX: ffff88801ecc4360 RCX: ffff88807805bb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff1100bf3ca95 R08: ffffc90000007500 R09: ffffc90000007510
R10: dffffc0000000000 R11: fffff52000000e6e R12: dffffc0000000000
R13: 0000000000000003 R14: 1ffff1100bf3ca96 R15: ffff88805f9e54b7
 __find_rr_leaf+0x240/0x750 net/ipv6/route.c:832
 find_rr_leaf net/ipv6/route.c:853 [inline]
 rt6_select net/ipv6/route.c:897 [inline]
 fib6_table_lookup+0x3c3/0xae0 net/ipv6/route.c:2184
 ip6_pol_route+0x21b/0x12d0 net/ipv6/route.c:2220
 pol_lookup_func include/net/ip6_fib.h:582 [inline]
 fib6_rule_lookup+0x222/0x5e0 net/ipv6/fib6_rules.c:115
 ip6_route_input_lookup net/ipv6/route.c:2290 [inline]
 ip6_route_input+0x77d/0xaa0 net/ipv6/route.c:2586
 ip6_rcv_finish+0x136/0x240 net/ipv6/ip6_input.c:77
 NF_HOOK+0x303/0x390 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5551 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5665
 process_backlog+0x366/0x770 net/core/dev.c:6542
 __napi_poll+0xbb/0x430 net/core/dev.c:7101
 napi_poll net/core/dev.c:7168 [inline]
 net_rx_action+0x522/0xa80 net/core/dev.c:7258
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:finish_lock_switch+0x12f/0x290 kernel/sched/core.c:4804
Code: 83 c7 18 be ff ff ff ff e8 0e 1b 6c 08 85 c0 74 46 4d 85 ff 75 62 0f 1f 44 00 00 48 89 df e8 c8 8a 75 08 e8 f3 df 2a 00 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 2f 0e fe ff 43 80 3c 2c
RSP: 0018:ffffc90002f3fb38 EFLAGS: 00000286
RAX: 0b88e1455dd2d500 RBX: ffff88813fe23b80 RCX: 0b88e1455dd2d500
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4540
RBP: 1ffff11017207613 R08: ffff8880b903b30b R09: 1ffff11017207661
R10: dffffc0000000000 R11: ffffed1017207662 R12: 1ffff110172075c1
R13: dffffc0000000000 R14: ffff8880b903ae08 R15: 0000000000000000
 finish_task_switch+0x12f/0x650 kernel/sched/core.c:4921
 context_switch kernel/sched/core.c:5052 [inline]
 __schedule+0x11cb/0x4350 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:exit_to_user_mode_loop+0x40/0x130 kernel/entry/common.c:168
Code: fb eb 1d e8 32 4f 59 08 65 48 8b 05 ba 3a 9b 7e 4c 8b 30 41 f7 c6 0e 30 02 00 0f 84 ed 00 00 00 e8 75 06 18 00 fb 41 f6 c6 08 <74> 05 e8 09 84 61 08 41 f7 c6 00 10 00 00 74 08 48 89 df e8 68 7f
RSP: 0000:ffffc90002f3ff10 EFLAGS: 00000202
RAX: 0b88e1455dd2d500 RBX: ffffc90002f3ff58 RCX: 0b88e1455dd2d500
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4540
RBP: 0000000000000000 R08: ffff8880b903b30b R09: 1ffff11017207661
R10: dffffc0000000000 R11: ffffed1017207662 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000008 R15: ffff88807805bb80
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0033:0x7f3095f34ee5
Code: 30 e8 03 00 00 48 8d 3d 29 1b 1d 00 48 89 d0 48 f7 64 24 38 31 c0 41 8b 36 48 c1 ea 12 48 01 ca 48 89 d9 48 2b 15 0b 18 ef 00 <e8> d6 e5 fe ff 41 8b 76 2c 85 f6 7e 4b 31 db 4c 8d 25 09 1b 1d 00
RSP: 002b:00007f30942a6050 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 00007f3096107e91 RCX: 00007f3096107e91
RDX: 00000000000207d4 RSI: 0000000000000001 RDI: 00007f30961069f0
RBP: 00007f30962f7090 R08: 00000000000000c8 R09: 001e4bc14d895848
R10: 0000006bb854f080 R11: 00000000000096b0 R12: 0000000000000000
R13: 00007f30962f7128 R14: 00007f30962f7090 R15: 00007ffc0e109748
 </TASK>