rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=8a6c/1/0x4000000000000000 softirq=243926/243926 fqs=4363
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1356869          0            0
rcu: 	cputime:    16747      35742           68   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=346453 q=2869 ncpus=2)
CPU: 0 PID: 25466 Comm: syz.4.14292 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:skb_headlen include/linux/skbuff.h:2435 [inline]
RIP: 0010:skb_copy_bits+0x46/0x7b0 net/core/skbuff.c:2799
Code: 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 d2 5e 13 f9 49 8d 7f 70 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 f4 06 00 00 <45> 8b 77 70 4c 89 7c 24 28 49 83 c7 74 4c 89 f8 48 c1 e8 03 42 0f
RSP: 0018:ffffc900000074c0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc900000075b0 RCX: ffff88807d323c00
RDX: 0000000000000100 RSI: 0000000000000006 RDI: ffff888074d3e430
RBP: ffffc90000007650 R08: ffff88807d323c00 R09: 0000000000000002
R10: 000000000000000a R11: 0000000000000100 R12: dffffc0000000000
R13: 0000000000000001 R14: dffffc0000000000 R15: ffff888074d3e3c0
FS:  00007f52c77186c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000003eb05000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ipv6_get_l4proto net/netfilter/nf_conntrack_core.c:382 [inline]
 get_l4proto+0x1ea/0x680 net/netfilter/nf_conntrack_core.c:410
 nf_conntrack_in+0x27f/0x15c0 net/netfilter/nf_conntrack_core.c:1991
 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:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 c1 3b ce f6 e8 3c 47 ff f6 fb bf 01 00 00 00 <e8> f1 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc9000519f960 EFLAGS: 00000286
RAX: 8c6dcef8e49f2b00 RBX: 0000000000000000 RCX: 8c6dcef8e49f2b00
RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: 0000000000000001
RBP: ffffc9000519fa10 R08: ffffffff911c35ff R09: 1ffffffff22386bf
R10: dffffc0000000000 R11: fffffbfff22386c0 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000a33f2c
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:234
Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <c3> 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 30 95 7c 7e 65 8b
RSP: 0018:ffffc9000519fad8 EFLAGS: 00000283
RAX: ffffffff817c14ff RBX: 0000000080000000 RCX: 0000000000080000
RDX: ffffc900123f8000 RSI: 0000000000003d1b RDI: 0000000000003d1c
RBP: ffffc9000519fbd0 R08: ffffffff911c35ff R09: 1ffffffff22386bf
R10: dffffc0000000000 R11: fffffbfff22386c0 R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff92000a33f60 R15: 1ffff92000a33f60
 smp_call_function_single+0x41f/0x5a0 kernel/smp.c:652
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x5be/0x920 kernel/events/core.c:2948
 __do_sys_perf_event_open kernel/events/core.c:12955 [inline]
 __se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12607
 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: 0033:0x7f52c679c819
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:00007f52c7718028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f52c6a15fa0 RCX: 00007f52c679c819
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f52c6832c91 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f52c6a16038 R14: 00007f52c6a15fa0 R15: 00007ffce42870c8
 </TASK>