dccp_xmit_packet: Payload too large (65475) for featneg.
dccp_xmit_packet: Payload too large (65475) for featneg.
device ip6gre0 entered promiscuous mode
==================================================================
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
BUG: KMSAN: uninit-value in memcmp+0x11d/0x180 lib/string.c:863
CPU: 0 PID: 6881 Comm: syz-executor5 Not tainted 4.19.0-rc1+ #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x14b/0x190 lib/dump_stack.c:113
 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645
 memcmp+0x11d/0x180 lib/string.c:863
 dev_uc_add_excl+0x165/0x7b0 net/core/dev_addr_lists.c:464
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
 ndo_dflt_fdb_add net/core/rtnetlink.c:3459 [inline]
 rtnl_fdb_add+0x1081/0x1270 net/core/rtnetlink.c:3554
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
 rtnetlink_rcv_msg+0xa0b/0x1530 net/core/rtnetlink.c:4711
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
 netlink_rcv_skb+0x36e/0x5f0 net/netlink/af_netlink.c:2454
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4729
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x1638/0x1720 net/netlink/af_netlink.c:1343
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
 netlink_sendmsg+0x1205/0x1290 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xe70/0x1290 net/socket.c:2114
hid-generic 0000:0000:0000.0001: unknown main item tag 0x0
hid-generic 0000:0000:0000.0001: hidraw0: <UNKNOWN> HID v0.00 Device [syz1] on syz1
 __sys_sendmsg net/socket.c:2152 [inline]
 __do_sys_sendmsg net/socket.c:2161 [inline]
 __se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457099
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3b2d8bcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3b2d8bd6d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000007
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d4890 R14: 00000000004c8ee5 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181
 kmsan_kmalloc+0x98/0x100 mm/kmsan/kmsan_hooks.c:91
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2719 [inline]
 __kmalloc_node_track_caller+0x9e7/0x1160 mm/slub.c:4352
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2f5/0x9e0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:996 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1189 [inline]
 netlink_sendmsg+0xb49/0x1290 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xe70/0x1290 net/socket.c:2114
 __sys_sendmsg net/socket.c:2152 [inline]
 __do_sys_sendmsg net/socket.c:2161 [inline]
 __se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================