=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
net/xfrm/xfrm_user.c:1630 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
locks held by syz.1.58/5838: 1, last CPU#0:
 #0: ffff888112a2c410 (&net->xfrm.xfrm_cfg_mutex){+.+.}-{4:4}, at: xfrm_netlink_rcv+0x6a/0x90

stack backtrace:
CPU: 0 UID: 0 PID: 5838 Comm: syz.1.58 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
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 lockdep_rcu_suspicious+0x140/0x1d0
 xfrm_nlmsg_multicast+0x1d8/0x1f0
 xfrm_send_migrate_state+0x870/0xae0
 xfrm_do_migrate_state+0x1703/0x1e50
 xfrm_user_rcv_msg+0x7a8/0xf30
 netlink_rcv_skb+0x226/0x4a0
 xfrm_netlink_rcv+0x79/0x90
 netlink_unicast+0x7bd/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 ____sys_sendmsg+0x54e/0x850
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1b1/0x290
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7effaab9e1d9
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:00007effabb29028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007effaae26090 RCX: 00007effaab9e1d9
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000000003
RBP: 00007effaac35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007effaae26128 R14: 00007effaae26090 R15: 00007ffcbeba0798
 </TASK>
