netlink: 'syz.4.2157': attribute type 4 has an invalid length.
------------[ cut here ]------------
debug_locks && !(lock_is_held(&(&n->tbl->lock)->dep_map) != 0)
WARNING: net/core/neighbour.c:154 at neigh_mark_dead+0x2fb/0x340 net/core/neighbour.c:154, CPU#0: syz.4.2157/11380
Modules linked in:
CPU: 0 UID: 0 PID: 11380 Comm: syz.4.2157 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:neigh_mark_dead+0x2fb/0x340 net/core/neighbour.c:154
Code: e8 03 42 80 3c 28 00 74 08 48 89 df e8 be 3a 6a f8 4c 89 33 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 16 48 f8 f7 90 <0f> 0b 90 e9 8f fd ff ff 48 c7 c1 e0 23 bc 90 80 e1 07 80 c1 03 38
RSP: 0018:ffffc9000e556620 EFLAGS: 00010287
RAX: ffffffff89d07ffa RBX: ffff88801e31c800 RCX: 0000000000080000
RDX: ffffc90019801000 RSI: 00000000000028d3 RDI: 00000000000028d4
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001caacbc R12: ffff88801e31c93c
R13: dffffc0000000000 R14: ffff88801e31c820 R15: ffff88801e31c800
FS:  00007f6622dd46c0(0000) GS:ffff888124633000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a49d556c8 CR3: 0000000033772000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 neigh_flush_one+0x27c/0x5a0 net/core/neighbour.c:388
 neigh_flush_dev net/core/neighbour.c:432 [inline]
 __neigh_ifdown+0x1fb/0xc70 net/core/neighbour.c:465
 neigh_ifdown+0x1f/0x30 net/core/neighbour.c:487
 rt6_disable_ip+0x751/0x7e0 net/ipv6/route.c:5013
 addrconf_ifdown+0x155/0x1ad0 net/ipv6/addrconf.c:3892
 addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86
 call_netdevice_notifiers_mtu net/core/dev.c:2386 [inline]
 netif_set_mtu_ext+0x5ac/0x830 net/core/dev.c:10031
 do_setlink+0xa81/0x47a0 net/core/rtnetlink.c:3251
 rtnl_setlink+0x578/0x820 net/core/rtnetlink.c:3627
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7163
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2572
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x7c3/0xae0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
 __sock_sendmsg net/socket.c:818 [inline]
 sock_write_iter+0x2de/0x3e0 net/socket.c:1269
 do_iter_readv_writev+0x612/0x8c0 fs/read_write.c:-1
 vfs_writev+0x343/0x990 fs/read_write.c:1058
 do_writev+0x154/0x2e0 fs/read_write.c:1104
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6621f9e199
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:00007f6622dd4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f6622225fa0 RCX: 00007f6621f9e199
RDX: 0000000000000001 RSI: 00002000000003c0 RDI: 0000000000000004
RBP: 00007f66220358e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6622226038 R14: 00007f6622225fa0 R15: 00007fffb6bdb088
 </TASK>