netlink: 12 bytes leftover after parsing attributes in process `syz.1.3272'.
------------[ cut here ]------------
!sock_allow_reclassification(sk)
WARNING: drivers/block/nbd.c:1249 at nbd_add_socket+0xf35/0x12c0, CPU#1: syz.1.3272/17056
Modules linked in:
CPU: 1 UID: 0 PID: 17056 Comm: syz.1.3272 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:nbd_add_socket+0xf35/0x12c0
Code: f7 e8 ff 51 1d fc bf e0 01 00 00 49 03 3e 48 c7 c6 a0 5c 55 8c e8 db d7 15 fb b8 f0 ff ff ff e9 b2 fd ff ff e8 ac d0 af fb 90 <0f> 0b 90 e9 16 f8 ff ff e8 6e ff 97 05 44 89 e9 80 e1 07 fe c1 38
RSP: 0018:ffffc9000395f140 EFLAGS: 00010283
RAX: ffffffff86166474 RBX: 1ffff11023503a59 RCX: 0000000000080000
RDX: ffffc90021d40000 RSI: 00000000000009db RDI: 00000000000009dc
RBP: ffffc9000395f230 R08: ffff88810e9b1d5f R09: 1ffff11021d363ab
R10: dffffc0000000000 R11: ffffed1021d363ac R12: ffff88811a81d100
R13: 1ffff9200072be34 R14: dffffc0000000000 R15: 0000000000000001
FS:  00007fa87827b6c0(0000) GS:ffff8882a9253000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa877388200 CR3: 00000001aad88000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 nbd_genl_connect+0x133d/0x1c10
 genl_family_rcv_msg_doit+0x233/0x340
 genl_rcv_msg+0x614/0x7a0
 netlink_rcv_skb+0x226/0x4a0
 genl_rcv+0x28/0x40
 netlink_unicast+0x7bb/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+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa87739ce59
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:00007fa87827b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa877616090 RCX: 00007fa87739ce59
RDX: 0000000000004000 RSI: 00002000000027c0 RDI: 0000000000000006
RBP: 00007fa877432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa877616128 R14: 00007fa877616090 R15: 00007ffe5992c078
 </TASK>
