------------[ cut here ]------------
err == -EMSGSIZE
WARNING: net/core/rtnetlink.c:4594 at rtmsg_ifinfo_build_skb+0x1c1/0x260 net/core/rtnetlink.c:4594, CPU#1: syz.2.2143/10627
Modules linked in:
CPU: 1 UID: 0 PID: 10627 Comm: syz.2.2143 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:rtmsg_ifinfo_build_skb+0x1c1/0x260 net/core/rtnetlink.c:4594
Code: ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 80 00 00 00 45 8b 76 08 e9 3c ff ff ff e8 d0 50 66 f8 90 <0f> 0b 90 ba 02 00 00 00 48 89 ee 31 ff bb a6 ff ff ff e8 c8 7a f0
RSP: 0018:ffffc9000d356dc0 EFLAGS: 00010283
RAX: 000000000000a5c8 RBX: 00000000ffffffa6 RCX: ffffc90026a9a000
RDX: 0000000000080000 RSI: ffffffff89a51100 RDI: ffff888028c90000
RBP: ffff88802ae428c0 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffa6 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888029ed8108
FS:  0000000000000000(0000) GS:ffff888096a60000(0063) knlGS:00000000f546db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7f4a190 CR3: 00000000767c8000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 rtmsg_ifinfo_event net/core/rtnetlink.c:4622 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4612 [inline]
 rtnetlink_event+0x137/0x1f0 net/core/rtnetlink.c:7192
 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275
 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
 call_netdevice_notifiers net/core/dev.c:2327 [inline]
 netdev_features_change net/core/dev.c:1612 [inline]
 netdev_update_features net/core/dev.c:11165 [inline]
 netdev_update_features net/core/dev.c:11162 [inline]
 netif_disable_lro+0x3e9/0x660 net/core/dev.c:1854
 inetdev_init+0x371/0x570 net/ipv4/devinet.c:284
 inetdev_event+0x827/0x17f0 net/ipv4/devinet.c:1590
 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275
 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
 call_netdevice_notifiers net/core/dev.c:2327 [inline]
 register_netdevice+0x1998/0x25a0 net/core/dev.c:11541
 macsec_newlink+0x4fb/0x1c50 drivers/net/macsec.c:4223
 rtnl_newlink_create net/core/rtnetlink.c:3969 [inline]
 __rtnl_newlink net/core/rtnetlink.c:4098 [inline]
 rtnl_newlink+0x1697/0x2620 net/core/rtnetlink.c:4215
 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7132
 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2713
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2767
 __sys_sendmsg+0x160/0x210 net/socket.c:2799
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf707efec
Code: Unable to access opcode bytes at 0xf707efc2.
RSP: 002b:00000000f546d50c EFLAGS: 00000292 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080000280
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>