rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=bff/1/0x4000000000000000 softirq=150187/150187 fqs=4570 
	(t=10500 jiffies g=205793 q=1778)
NMI backtrace for cpu 0
CPU: 0 PID: 13513 Comm: syz.5.14075 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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+0x22f/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31d/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+0x6ea/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 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+0x4ad/0xb70 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 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:seqcount_lockdep_reader_access+0x196/0x1d0 include/linux/seqlock.h:106
Code: 00 4d 85 e4 75 16 e8 b9 f7 0f 00 eb 15 e8 b2 f7 0f 00 e8 dd c0 52 08 4d 85 e4 74 ea e8 a3 f7 0f 00 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 43 c7 44 3e 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc90000006920 EFLAGS: 00000246
RAX: ffffffff816927fd RBX: 0000000000000000 RCX: ffff88805faa5940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900000069d8 R08: ffffffff901d11c7 R09: 1ffffffff203a238
R10: dffffc0000000000 R11: fffffbfff203a239 R12: 0000000000000200
R13: 1ffff92000000d4c R14: 1ffff92000000d24 R15: dffffc0000000000
 timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
 ktime_get_with_offset+0xff/0x320 kernel/time/timekeeping.c:874
 ktime_get_real include/linux/timekeeping.h:79 [inline]
 __net_timestamp include/linux/skbuff.h:3970 [inline]
 netif_rx_internal+0x380/0x560 net/core/dev.c:4966
 netif_rx+0x94/0x380 net/core/dev.c:5018
 veth_forward_skb drivers/net/veth.c:297 [inline]
 veth_xmit+0x605/0xa60 drivers/net/veth.c:350
 __netdev_start_xmit include/linux/netdevice.h:5036 [inline]
 netdev_start_xmit include/linux/netdevice.h:5050 [inline]
 xmit_one net/core/dev.c:3649 [inline]
 dev_hard_start_xmit+0x2a5/0x7e0 net/core/dev.c:3665
 __dev_queue_xmit+0x1a78/0x2fd0 net/core/dev.c:4288
 br_dev_queue_push_xmit+0x692/0x850 net/bridge/br_forward.c:53
 NF_HOOK+0x2f9/0x380 include/linux/netfilter.h:302
 br_forward_finish+0x74/0x80 net/bridge/br_forward.c:66
 NF_HOOK+0x2f9/0x380 include/linux/netfilter.h:302
 __br_forward+0x433/0x610 net/bridge/br_forward.c:115
 deliver_clone net/bridge/br_forward.c:131 [inline]
 maybe_deliver+0xb5/0x150 net/bridge/br_forward.c:190
 br_flood+0x2fc/0x450 net/bridge/br_forward.c:232
 br_dev_xmit+0xf2c/0x14b0 net/bridge/br_device.c:-1
 __netdev_start_xmit include/linux/netdevice.h:5036 [inline]
 netdev_start_xmit include/linux/netdevice.h:5050 [inline]
 xmit_one net/core/dev.c:3649 [inline]
 dev_hard_start_xmit+0x2a5/0x7e0 net/core/dev.c:3665
 __dev_queue_xmit+0x1a78/0x2fd0 net/core/dev.c:4288
 neigh_output include/net/neighbour.h:509 [inline]
 ip6_finish_output2+0x108c/0x1510 net/ipv6/ip6_output.c:130
 dst_output include/net/dst.h:452 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xc2a/0x1500 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3956
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x53a/0x7f0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x339/0x830 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:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6799
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 e5 2f 8e f7 e8 70 19 bb f7 fb bf 01 00 00 00 <e8> 65 b5 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc9000337fd80 EFLAGS: 00000282
RAX: 6f31585f0908d900 RBX: 0000000000000000 RCX: 6f31585f0908d900
RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: 0000000000000001
RBP: ffffc9000337fe20 R08: ffff8880b903b30b R09: 1ffff11017207661
R10: dffffc0000000000 R11: ffffed1017207662 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200066ffb0
 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:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2111 [inline]
RIP: 0010:schedule+0x137/0x1e0 kernel/sched/core.c:6480
Code: 00 00 e8 9c 35 8e f7 31 ff e8 25 bb ff ff bf 01 00 00 00 e8 1b 37 8e f7 48 89 df be 08 00 00 00 e8 1e f9 f9 f7 43 80 3c 26 00 <74> c8 48 89 df e8 7f f7 f9 f7 eb be 49 89 de 49 83 c6 2c 4c 89 f0
RSP: 0018:ffffc9000337fee0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88805faa5940 RCX: ffffffff89c42c32
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88805faa5940
RBP: 0000000000000000 R08: ffff88805faa5947 R09: 1ffff1100bf54b28
R10: dffffc0000000000 R11: ffffed100bf54b29 R12: dffffc0000000000
R13: 0000000000000000 R14: 1ffff1100bf54b28 R15: ffff88805faa5940
 exit_to_user_mode_loop+0x47/0x130 kernel/entry/common.c:169
 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: 0033:0x7fbb72ce8ae7
Code: 05 e6 f5 3b 00 48 89 18 48 8b 05 d4 f5 3b 00 c7 00 00 00 01 00 5b c3 66 66 2e 0f 1f 84 00 00 00 00 00 90 80 3d c2 52 3c 00 00 <48> 8b 47 18 48 8b 4f 28 74 1f 48 8b 30 89 f2 83 c6 02 48 8d 04 f0
RSP: 002b:00007fbb7108c048 EFLAGS: 00000202
RAX: 00007fbb730abfa0 RBX: 00007fbb730abfa0 RCX: 00007fbb730abfa0
RDX: 00007fbb72f4c920 RSI: 0000000000000000 RDI: 00007fbb730ac038
RBP: 00007fbb72e9ec1f R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb730ac038 R14: 00007fbb730abfa0 R15: 00007fff40191468
 </TASK>