rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=ccf/1/0x4000000000000000 softirq=53299/53300 fqs=5232 
	(detected by 1, t=10502 jiffies, g=77077, q=1937)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 18437 Comm: syz.4.3007 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:check_preemption_disabled+0x42/0x110 lib/smp_processor_id.c:55
Code: 65 8b 05 59 dc 45 76 65 8b 0d c2 36 46 76 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 0f 85 c4 00 00 00 <48> 83 c4 10 5b 41 5e 41 5f 5d c3 48 c7 04 24 00 00 00 00 9c 8f 04
RSP: 0018:ffffc900000076c0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc90000007718 RCX: 3ee0363c39842f00
RDX: 1ffffffff1e1d000 RSI: ffffffff8a2a0fc0 RDI: ffffffff8a79f800
RBP: 0000000000000000 R08: ffffffff8f0e8008 R09: ffffffff8f0e8018
R10: ffffffff8f0e8010 R11: ffffffff8f0e8003 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fe04dbd46c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39fc63da10 CR3: 000000001ade4000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 irq_exit_rcu+0x11/0x20 kernel/softirq.c:673
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x4f/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 e2 f0 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000077c0 EFLAGS: 00000206
RAX: 3ee0363c39842f00 RBX: 1ffff92000000efc RCX: 3ee0363c39842f00
RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f800
RBP: ffffc900000078a0 R08: ffffffff901d31bf R09: 1ffffffff203a637
R10: dffffc0000000000 R11: fffffbfff203a638 R12: ffffffff8c322f00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 ndisc_send_skb+0xde0/0x1500 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3956
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x53e/0x800 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 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:strcmp+0x28/0xb0 lib/string.c:400
Code: 00 00 55 41 57 41 56 41 54 53 48 bb 00 00 00 00 00 fc ff df 45 31 f6 4a 8d 04 37 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9 75 28 <42> 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9
RSP: 0018:ffffc900035d6ec0 EFLAGS: 00000246
RAX: ffffffff8a3039e0 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffc9001987d000 RSI: ffffffff8a420760 RDI: ffffffff8a3039e0
RBP: ffff888016d89680 R08: ffff888016daca4f R09: 1ffff11002db5949
R10: dffffc0000000000 R11: ffffed1002db594a R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8d749b28
 __ftrace_set_clr_event_nolock+0x2a1/0x3a0 kernel/trace/trace_events.c:1168
 __ftrace_set_clr_event kernel/trace/trace_events.c:1196 [inline]
 trace_set_clr_event+0xd1/0x130 kernel/trace/trace_events.c:1261
 bpf_get_trace_printk_proto+0x1e/0x80 kernel/trace/bpf_trace.c:408
 check_helper_call+0x1c2/0x5660 kernel/bpf/verifier.c:6549
 do_check+0x6156/0xeb00 kernel/bpf/verifier.c:11427
 do_check_common+0xe82/0x16e0 kernel/bpf/verifier.c:13506
 do_check_main kernel/bpf/verifier.c:13569 [inline]
 bpf_check+0x9c84/0xf270 kernel/bpf/verifier.c:14140
 bpf_prog_load+0xfec/0x1510 kernel/bpf/syscall.c:2354
 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fe04f9bc629
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:00007fe04dbd4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fe04fc36180 RCX: 00007fe04f9bc629
RDX: 0000000000000094 RSI: 0000200000000240 RDI: 0000000000000005
RBP: 00007fe04fa52b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe04fc36218 R14: 00007fe04fc36180 R15: 00007ffe3c696368
 </TASK>