bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered forwarding state
device bridge0 entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
==================================================================
BUG: KMSAN: uninit-value in copyout lib/iov_iter.c:140 [inline]
BUG: KMSAN: uninit-value in _copy_to_iter+0x1b14/0x2800 lib/iov_iter.c:571
CPU: 0 PID: 22078 Comm: syz-executor5 Not tainted 4.17.0-rc5+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
IPVS: ftp: loaded support on port[0] = 21
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x149/0x260 mm/kmsan/kmsan.c:1084
 kmsan_internal_check_memory+0x135/0x1e0 mm/kmsan/kmsan.c:1177
 kmsan_copy_to_user+0x75/0x160 mm/kmsan/kmsan.c:1219
 copyout lib/iov_iter.c:140 [inline]
 _copy_to_iter+0x1b14/0x2800 lib/iov_iter.c:571
 copy_to_iter include/linux/uio.h:106 [inline]
 skb_copy_datagram_iter+0x422/0xfa0 net/core/datagram.c:431
 skb_copy_datagram_msg include/linux/skbuff.h:3268 [inline]
 netlink_recvmsg+0x6f1/0x1900 net/netlink/af_netlink.c:1959
 sock_recvmsg_nosec net/socket.c:802 [inline]
 sock_recvmsg net/socket.c:809 [inline]
 sock_read_iter+0x40a/0x480 net/socket.c:886
 do_iter_readv_writev+0x81c/0xa20 include/linux/fs.h:1778
 do_iter_read+0x303/0xd80 fs/read_write.c:922
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x295/0x5f0 fs/read_write.c:1019
 __do_sys_readv fs/read_write.c:1106 [inline]
 __se_sys_readv fs/read_write.c:1103 [inline]
 __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a09
RSP: 002b:00007fc223ee0c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007fc223ee16d4 RCX: 0000000000455a09
RDX: 0000000000000008 RSI: 00000000200016c0 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000056b R14: 00000000006fd2a8 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:294 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685
 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:527
 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:478
 __nla_put lib/nlattr.c:569 [inline]
 nla_put+0x276/0x340 lib/nlattr.c:627
 copy_to_user_policy_type net/xfrm/xfrm_user.c:1678 [inline]
 build_acquire net/xfrm/xfrm_user.c:2850 [inline]
 xfrm_send_acquire+0x1068/0x1690 net/xfrm/xfrm_user.c:2873
 km_query net/xfrm/xfrm_state.c:1953 [inline]
 xfrm_state_find+0x3b55/0x4fa0 net/xfrm/xfrm_state.c:1021
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1393 [inline]
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:1437 [inline]
 xfrm_resolve_and_create_bundle+0xc37/0x5270 net/xfrm/xfrm_policy.c:1833
 xfrm_lookup+0x606/0x39f0 net/xfrm/xfrm_policy.c:2163
 xfrm_lookup_route+0xfa/0x360 net/xfrm/xfrm_policy.c:2283
 ip6_dst_lookup_flow+0x221/0x270 net/ipv6/ip6_output.c:1102
 ip6_datagram_dst_update+0x957/0xd90 net/ipv6/datagram.c:91
 __ip6_datagram_connect+0x154b/0x1a70 net/ipv6/datagram.c:250
 ip6_datagram_connect net/ipv6/datagram.c:273 [inline]
 ip6_datagram_connect_v6_only+0x102/0x180 net/ipv6/datagram.c:285
 inet_dgram_connect+0x33a/0x680 net/ipv4/af_inet.c:571
 __sys_connect+0x41f/0x510 net/socket.c:1665
 __do_sys_connect net/socket.c:1676 [inline]
 __se_sys_connect net/socket.c:1673 [inline]
 __x64_sys_connect+0xd8/0x120 net/socket.c:1673
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Local variable description: ----upt.i.i@xfrm_send_acquire
Variable was created at:
 xfrm_send_acquire+0x73/0x1690 net/xfrm/xfrm_user.c:2864
 km_query net/xfrm/xfrm_state.c:1953 [inline]
 xfrm_state_find+0x3b55/0x4fa0 net/xfrm/xfrm_state.c:1021

Byte 50 of 57 is uninitialized
Memory access starts at ffff880174a2113f
==================================================================