rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=d9c4/1/0x4000000000000000 softirq=21635/21640 fqs=5193
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1319101          0            0
rcu: 	cputime:    30381      22108           73   ==> 52490(ms)
rcu: 	(t=10501 jiffies g=13001 q=46007 ncpus=2)
CPU: 0 UID: 0 PID: 6524 Comm: syz.3.88 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:unwind_next_frame+0x1166/0x2390
Code: 6c 24 50 74 0c 4c 89 ef e8 47 43 b0 00 48 8b 14 24 4d 89 65 00 41 0f b6 04 2f 84 c0 0f 85 f9 0f 00 00 c6 03 00 4c 8b 64 24 10 <4c> 8b 7c 24 28 48 8b 44 24 40 0f b6 04 28 84 c0 0f 85 8a 0d 00 00
RSP: 0018:ffffc900000071b8 EFLAGS: 00000246
RAX: ffffc900000072d8 RBX: ffffc900000072c0 RCX: 0000000000000000
RDX: ffffffff90c57dbc RSI: 0000000000000000 RDI: ffffc900000072e8
RBP: dffffc0000000000 R08: ffffc900000072e7 R09: 0000000000000000
R10: ffffc900000072d8 R11: fffff52000000e5d R12: ffffc900000078c0
R13: ffffc900000072d8 R14: ffffc90000007288 R15: ffffc900000072d0
FS:  00007f9986a136c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c24bec2 CR3: 0000000028a18000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 ___neigh_create+0x6d5/0x2260
 ip6_finish_output2+0xb4d/0x16a0
 ndisc_send_skb+0xb54/0x1440
 addrconf_rs_timer+0x369/0x670
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 fb 98 15 f6 e8 36 f3 4c f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900033df5a0 EFLAGS: 00000286
RAX: 6725cebf25dfdb00 RBX: 0000000000000000 RCX: 6725cebf25dfdb00
RDX: 0000000000000007 RSI: ffffffff8d9b6934 RDI: 0000000000000001
RBP: ffffc900033df650 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6
R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200067beb4
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:in_gate_area_no_mm+0x0/0x60
Code: fb 41 0f 92 c6 44 89 f0 5b 41 5e 41 5f 5d e9 87 56 48 0a cc 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 53 48 89 fb e8 d2 e6 8b 00 8b 2d 7c 9a 89 0c bf 02
RSP: 0018:ffffc900033df710 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f9985b8ebe9 RCX: 6725cebf25dfdb01
RDX: 0000000000000001 RSI: ffffffff8dba5be1 RDI: 00007f9985b8ebe9
RBP: 0000000000000001 R08: 0000000000000022 R09: ffffffff8172c195
R10: ffffc900033df7b8 R11: ffffffff81ac3930 R12: ffff88801ff98000
R13: ffff88803cdaa000 R14: dffffc0000000000 R15: 1ffff9200067bef6
 kernel_text_address+0x2d/0xe0
 __kernel_text_address+0xd/0x40
 unwind_get_return_address+0x4d/0x90
 arch_stack_walk+0xfc/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 tomoyo_realpath_from_path+0xe3/0x5d0
 tomoyo_path_number_perm+0x1e8/0x5a0
 security_file_ioctl+0xcb/0x2d0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9985b8ebe9
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:00007f9986a13038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9985dc5fa0 RCX: 00007f9985b8ebe9
RDX: 00002000000013c0 RSI: 0000000000005452 RDI: 0000000000000000
RBP: 00007f9985c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9985dc6038 R14: 00007f9985dc5fa0 R15: 00007ffeb3c36a68
 </TASK>
