------------[ cut here ]------------
WARNING: CPU: 1 PID: 7975 at net/mptcp/pm.c:379 mptcp_pm_alloc_anno_list+0x3fe/0x460
Modules linked in:
CPU: 1 UID: 0 PID: 7975 Comm: syz.1.513 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:mptcp_pm_alloc_anno_list+0x3fe/0x460
Code: b0 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 57 5c 15 00 cc e8 c1 3d 5f f6 90 0f 0b 90 e9 8b fc ff ff e8 b3 3d 5f f6 90 <0f> 0b 90 31 c0 eb d1 48 c7 c1 60 1f a3 8f 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000a5e6d30 EFLAGS: 00010283
RAX: ffffffff8b606fdd RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90009b9b000 RSI: 0000000000002028 RDI: 0000000000002029
RBP: ffff888106c6b600 R08: 00000000000a0003 R09: 0000000000000000
R10: 0000000000000000 R11: aa1414acffff0000 R12: ffff888039a50000
R13: ffff888039a50000 R14: dffffc0000000000 R15: ffffc9000a5e6f00
FS:  00007f3f332306c0(0000) GS:ffff8881a3c3d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3f32374c80 CR3: 0000000028808000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 mptcp_pm_create_subflow_or_signal_addr+0x1448/0x1c30
 mptcp_pm_nl_add_addr_doit+0xe66/0x1460
 genl_family_rcv_msg_doit+0x215/0x300
 genl_rcv_msg+0x60e/0x790
 netlink_rcv_skb+0x208/0x470
 genl_rcv+0x28/0x40
 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: 0033:0x7f3f3238ec29
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:00007f3f33230038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3f325d6090 RCX: 00007f3f3238ec29
RDX: 0000000004000000 RSI: 0000200000000400 RDI: 0000000000000005
RBP: 00007f3f32411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3f325d6128 R14: 00007f3f325d6090 R15: 00007ffebc375148
 </TASK>
