==================================================================
BUG: KMSAN: uninit-value in ebt_stp_mt_check+0x24b/0x460 net/bridge/netfilter/ebt_stp.c:162
CPU: 0 PID: 8659 Comm: syz-executor6 Not tainted 4.17.0-rc5+ #102
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Not allocated shadow for addr ffff880136e6c000 (page ffffea0007496880)
Call Trace:
------------[ cut here ]------------
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
kernel BUG at mm/kmsan/kmsan.c:1344!
invalid opcode: 0000 [#1] SMP PTI
 kmsan_report+0x149/0x260 mm/kmsan/kmsan.c:1084
Dumping ftrace buffer:
 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686
   (ftrace buffer empty)
 ebt_stp_mt_check+0x24b/0x460 net/bridge/netfilter/ebt_stp.c:162
Modules linked in:
 xt_check_match+0x13fb/0x1610 net/netfilter/x_tables.c:500
CPU: 1 PID: 4450 Comm: sshd Not tainted 4.17.0-rc5+ #102
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 mm/kmsan/kmsan.c:1343
 ebt_check_match net/bridge/netfilter/ebtables.c:372 [inline]
 ebt_check_entry net/bridge/netfilter/ebtables.c:702 [inline]
 translate_table+0x4bb5/0x60f0 net/bridge/netfilter/ebtables.c:943
RSP: 0018:ffff8801984be6f0 EFLAGS: 00010002
 do_replace_finish+0x1258/0x2ea0 net/bridge/netfilter/ebtables.c:999
RAX: 0000000000000046 RBX: 00000000000004c0 RCX: 0000000000000000
 do_replace+0x719/0x780 net/bridge/netfilter/ebtables.c:1138
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88021fd36eec
 do_ebt_set_ctl+0x2ab/0x3c0 net/bridge/netfilter/ebtables.c:1517
RBP: ffff8801984be708 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880136e6c000
R13: 00000000000002ae R14: 0000000000000001 R15: 00000000000002ae
FS:  00007f86d77017c0(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x476/0x4d0 net/netfilter/nf_sockopt.c:115
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 ip_setsockopt+0x24b/0x2b0 net/ipv4/ip_sockglue.c:1253
CR2: 0000000000a47e80 CR3: 00000001c9aaa000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 tcp_setsockopt+0x1bb/0x1f0 net/ipv4/tcp.c:2891
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_common_setsockopt+0x136/0x170 net/core/sock.c:3039
 kmsan_internal_memset_shadow mm/kmsan/kmsan.c:172 [inline]
 kmsan_internal_unpoison_shadow+0x5c/0xe0 mm/kmsan/kmsan.c:209
 kmsan_unpoison_shadow+0x66/0xb0 mm/kmsan/kmsan.c:223
 __sys_setsockopt+0x4af/0x560 net/socket.c:1903
 virtqueue_get_buf_ctx+0x73f/0xa20 drivers/virtio/virtio_ring.c:759
 __do_sys_setsockopt net/socket.c:1914 [inline]
 __se_sys_setsockopt net/socket.c:1911 [inline]
 __x64_sys_setsockopt+0x15c/0x1c0 net/socket.c:1911
 virtqueue_get_buf+0x72/0x90 drivers/virtio/virtio_ring.c:766
 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287
 free_old_xmit_skbs drivers/net/virtio_net.c:1234 [inline]
 start_xmit+0x293/0x29b0 drivers/net/virtio_net.c:1399
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a09
RSP: 002b:00007f37675edc68 EFLAGS: 00000246
 __netdev_start_xmit include/linux/netdevice.h:4087 [inline]
 netdev_start_xmit include/linux/netdevice.h:4096 [inline]
 xmit_one net/core/dev.c:3053 [inline]
 dev_hard_start_xmit+0x5f1/0xc70 net/core/dev.c:3069
 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f37675ee6d4 RCX: 0000000000455a09
 sch_direct_xmit+0x578/0x8f0 net/sched/sch_generic.c:327
RDX: 0000000000000080 RSI: 0000000000000000 RDI: 0000000000000013
 qdisc_restart net/sched/sch_generic.c:399 [inline]
 __qdisc_run+0x1785/0x3730 net/sched/sch_generic.c:410
RBP: 000000000072bea0 R08: 00000000000002e8 R09: 0000000000000000
 __dev_xmit_skb net/core/dev.c:3244 [inline]
 __dev_queue_xmit+0x1d50/0x3510 net/core/dev.c:3552
R10: 00000000200000c0 R11: 0000000000000246 R12: 00000000ffffffff
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617
R13: 00000000000005c8 R14: 00000000006fcb60 R15: 0000000000000000
 neigh_hh_output include/net/neighbour.h:472 [inline]
 neigh_output include/net/neighbour.h:480 [inline]
 ip_finish_output2+0x12bf/0x1490 net/ipv4/ip_output.c:229
Local variable description: ----mtpar.i@translate_table
 ip_finish_output+0xcaf/0xff0 net/ipv4/ip_output.c:317
Variable was created at:
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405
 translate_table+0xbc/0x60f0 net/bridge/netfilter/ebtables.c:831
 do_replace_finish+0x1258/0x2ea0 net/bridge/netfilter/ebtables.c:999
==================================================================
 dst_output include/net/dst.h:444 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 ip_queue_xmit+0x1a1d/0x1d10 net/ipv4/ip_output.c:504