rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=dc2c/1/0x4000000000000000 softirq=22994/22995 fqs=5246
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5256          0            0
rcu: 	cputime:      247          0        52252   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=12525 q=4941 ncpus=2)
CPU: 0 UID: 0 PID: 7178 Comm: syz.1.309 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:xfrm_alloc_spi+0x502/0xf30
Code: 1d 9c f7 49 bc 00 00 00 00 00 fc ff df 31 ff 89 de e8 52 21 9c f7 85 db 0f 85 0a 01 00 00 e8 05 1d 9c f7 eb 05 e8 fe 1c 9c f7 <49> 83 c5 28 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8
RSP: 0018:ffffc900065670e0 EFLAGS: 00000246
RAX: ffffffff8a239042 RBX: 00000000e3000000 RCX: 0000000000080000
RDX: ffffc900035e9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90006567230 R08: 0000000000000000 R09: ffffffff8a238e30
R10: dffffc0000000000 R11: fffff52000cace0c R12: dffffc0000000000
R13: ffff888031b5a400 R14: 0000000000000000 R15: ffffc900065676a0
FS:  00007f046325d6c0(0000) GS:ffff8880b863d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000001ec04000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 xfrm_alloc_userspi+0x70b/0xc90
 xfrm_user_rcv_msg+0x7a3/0xab0
 netlink_rcv_skb+0x208/0x470
 xfrm_netlink_rcv+0x79/0x90
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f046238ec29
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:00007f046325d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f04625d5fa0 RCX: 00007f046238ec29
RDX: 0000000000000000 RSI: 0000200000000540 RDI: 0000000000000005
RBP: 00007f0462411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f04625d6038 R14: 00007f04625d5fa0 R15: 00007ffff7f4ba48
 </TASK>
