rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (7220 ticks this GP) idle=4004/1/0x4000000000000000 softirq=21850/21850 fqs=5018
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1304643          0            0
rcu: 	cputime:    30496      21993           89   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=16181 q=8309 ncpus=2)
CPU: 1 UID: 0 PID: 7454 Comm: syz.0.408 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:should_failslab+0x93/0x100
Code: 48 c1 e9 03 42 0f b6 0c 21 84 c9 75 62 41 f6 47 01 40 74 37 c1 eb 0d 83 e3 01 49 83 c6 1c 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 <84> c0 75 2a 41 8b 36 48 c7 c7 60 96 25 8e 89 da e8 48 6c d9 02 31
RSP: 0018:ffffc900001e0620 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000020 RSI: 0000000000002920 RDI: ffff88801a441780
RBP: 0000000000002920 R08: ffff88803a4b460b R09: 1ffff110074968c1
R10: dffffc0000000000 R11: ffffed10074968c2 R12: dffffc0000000000
R13: ffffffff8dbdf678 R14: ffff88801a44179c R15: ffff88801a441780
FS:  00007f745dc286c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2548e1 CR3: 0000000115d72000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __kmalloc_cache_noprof+0x70/0x3d0
 ref_tracker_alloc+0x133/0x460
 dst_init+0xd9/0x450
 dst_alloc+0x12a/0x170
 icmp6_dst_alloc+0x75/0x420
 ndisc_send_skb+0x41f/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:fput+0x40/0xd0
Code: 01 00 00 bf 01 00 00 00 e8 1d 94 5b ff 4c 89 f7 be 08 00 00 00 e8 c0 bb ee ff 49 c7 c7 ff ff ff ff f0 4c 0f c1 bb 60 01 00 00 <49> 8d 77 ff 48 c7 c7 ff ff ff ff e8 80 49 8b ff 49 ff cf 78 09 e8
RSP: 0018:ffffc90007587e90 EFLAGS: 00000257
RAX: 1ffff11021193901 RBX: ffff888027d10000 RCX: ffffffff82346790
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888027d10160
RBP: 0000000000000000 R08: ffff888027d10167 R09: 1ffff11004fa202c
R10: dffffc0000000000 R11: ffffed1004fa202d R12: 0000000000005452
R13: 0000000000000003 R14: ffff888027d10160 R15: 0000000000000001
 __se_sys_ioctl+0x168/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f745cd8ebe9
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:00007f745dc28038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f745cfc5fa0 RCX: 00007f745cd8ebe9
RDX: 00002000000006c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f745ce11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f745cfc6038 R14: 00007f745cfc5fa0 R15: 00007ffd843f07f8
 </TASK>
