rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (9273 ticks this GP) idle=a5f4/1/0x4000000000000000 softirq=51855/51856 fqs=5244
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1410637          0            0
rcu: 	cputime:    29929      22558           67   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=36997 q=2810 ncpus=2)
CPU: 0 UID: 0 PID: 10880 Comm: syz.6.1145 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+0x130e/0x2390
Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49
RSP: 0018:ffffc900000071b8 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffffffff8fb7d2d8 RCX: dffffc0000000000
RDX: ffffffff8fb7d2d0 RSI: ffffffff903405e4 RDI: ffffffff8be332a0
RBP: ffffffff8fb7d2d0 R08: 0000000000000003 R09: ffffffff8172c195
R10: ffffc900000072d8 R11: ffffffff81ac3930 R12: ffffffff8184f4d9
R13: ffffffff8fb7d2d0 R14: ffffc90000007288 R15: ffffffff8fb7d2d4
FS:  00007f886fb6a6c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000276d0000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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:ffffc90004257bc0 EFLAGS: 00000282
RAX: 4d589d0e563d8100 RBX: 0000000000000000 RCX: 4d589d0e563d8100
RDX: 0000000000000000 RSI: ffffffff8d9b6a0a RDI: 0000000000000001
RBP: ffffc90004257c60 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200084af78
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:task_mm_cid_work+0x6b0/0x760
Code: c6 54 91 00 48 8b 33 4a 8d 1c 2e 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 20 8b 03 <44> 39 f8 0f 8c 25 ff ff ff 4c 01 ee 48 8b 7c 24 08 44 89 e2 e8 67
RSP: 0018:ffffc90004257d20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffe8ffffc256c8 RCX: dffffc0000000000
RDX: 0000000000000003 RSI: ffff8881a3c1c000 RDI: 0000000000000003
RBP: ffffc90004257df0 R08: 0000000000000000 R09: ffffffff8191c89f
R10: dffffc0000000000 R11: fffff5200084afb1 R12: 0000000000000001
R13: 0000607e5c0096c0 R14: 1ffffffff1b7be74 R15: 0000000000000002
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f886ed8ebe9
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:00007f886fb6a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f886efb5fa0 RCX: 00007f886ed8ebe9
RDX: 0000200000000400 RSI: 0000000000005452 RDI: 0000000000000006
RBP: 00007f886ee11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f886efb6038 R14: 00007f886efb5fa0 R15: 00007ffd405183c8
 </TASK>
