==================================================================
BUG: KMSAN: uninit-value in __flow_hash_consistentify net/core/flow_dissector.c:1320 [inline]
BUG: KMSAN: uninit-value in __flow_hash_from_keys+0x544/0x1070 net/core/flow_dissector.c:1349
CPU: 1 PID: 17024 Comm: syz-executor.5 Not tainted 5.1.0+ #1
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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x130/0x2a0 mm/kmsan/kmsan.c:622
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:310
 __flow_hash_consistentify net/core/flow_dissector.c:1320 [inline]
 __flow_hash_from_keys+0x544/0x1070 net/core/flow_dissector.c:1349
 ___skb_get_hash net/core/flow_dissector.c:1372 [inline]
 __skb_get_hash+0x156/0x3e0 net/core/flow_dissector.c:1435
 skb_get_hash include/linux/skbuff.h:1326 [inline]
 ip_tunnel_xmit+0x7e6/0x3290 net/ipv4/ip_tunnel.c:750
 __gre_xmit net/ipv4/ip_gre.c:449 [inline]
 gre_tap_xmit+0xa73/0xb80 net/ipv4/ip_gre.c:712
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 sch_direct_xmit+0x571/0x870 net/sched/sch_generic.c:328
 qdisc_restart net/sched/sch_generic.c:391 [inline]
 __qdisc_run+0x158b/0x3380 net/sched/sch_generic.c:399
 qdisc_run include/net/pkt_sched.h:121 [inline]
 __dev_xmit_skb net/core/dev.c:3487 [inline]
 __dev_queue_xmit+0x21a0/0x3b60 net/core/dev.c:3846
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 br_dev_queue_push_xmit+0x803/0x8b0 net/bridge/br_forward.c:56
 NF_HOOK include/linux/netfilter.h:289 [inline]
 br_forward_finish net/bridge/br_forward.c:69 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 __br_forward+0xa2a/0xe10 net/bridge/br_forward.c:113
 deliver_clone net/bridge/br_forward.c:129 [inline]
 maybe_deliver net/bridge/br_forward.c:184 [inline]
 br_flood+0xc65/0x10b0 net/bridge/br_forward.c:226
 br_dev_xmit+0x1614/0x16b0 net/bridge/br_device.c:99
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 neigh_resolve_output+0xab7/0xb50 net/core/neighbour.c:1487
 neigh_output include/net/neighbour.h:508 [inline]
 ip_finish_output2+0x1709/0x1930 net/ipv4/ip_output.c:229
 ip_finish_output+0xd2a/0xfd0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x541/0x610 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x8a7/0xdd0 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x2ed5/0x3290 net/ipv4/ip_tunnel.c:831
 __gre_xmit net/ipv4/ip_gre.c:449 [inline]
 ipgre_xmit+0xffc/0x1130 net/ipv4/ip_gre.c:633
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 packet_snd net/packet/af_packet.c:2936 [inline]
 packet_sendmsg+0x815b/0x8f80 net/packet/af_packet.c:2961
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x459279
Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f225a31dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f225a31e6d4
R13: 00000000004c6ccc R14: 00000000004dbb30 R15: 00000000ffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:208 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:223 [inline]
 kmsan_internal_chain_origin+0x133/0x230 mm/kmsan/kmsan.c:429
 kmsan_memcpy_memmove_metadata+0x969/0xd40 mm/kmsan/kmsan.c:307
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:327
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:139
 __skb_flow_dissect+0x2c2a/0x75b0 net/core/flow_dissector.c:858
 skb_flow_dissect_flow_keys include/linux/skbuff.h:1303 [inline]
 ___skb_get_hash net/core/flow_dissector.c:1369 [inline]
 __skb_get_hash+0x12b/0x3e0 net/core/flow_dissector.c:1435
 skb_get_hash include/linux/skbuff.h:1326 [inline]
 ip_tunnel_xmit+0x7e6/0x3290 net/ipv4/ip_tunnel.c:750
 __gre_xmit net/ipv4/ip_gre.c:449 [inline]
 gre_tap_xmit+0xa73/0xb80 net/ipv4/ip_gre.c:712
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 sch_direct_xmit+0x571/0x870 net/sched/sch_generic.c:328
 qdisc_restart net/sched/sch_generic.c:391 [inline]
 __qdisc_run+0x158b/0x3380 net/sched/sch_generic.c:399
 qdisc_run include/net/pkt_sched.h:121 [inline]
 __dev_xmit_skb net/core/dev.c:3487 [inline]
 __dev_queue_xmit+0x21a0/0x3b60 net/core/dev.c:3846
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 br_dev_queue_push_xmit+0x803/0x8b0 net/bridge/br_forward.c:56
 NF_HOOK include/linux/netfilter.h:289 [inline]
 br_forward_finish net/bridge/br_forward.c:69 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 __br_forward+0xa2a/0xe10 net/bridge/br_forward.c:113
 deliver_clone net/bridge/br_forward.c:129 [inline]
 maybe_deliver net/bridge/br_forward.c:184 [inline]
 br_flood+0xc65/0x10b0 net/bridge/br_forward.c:226
 br_dev_xmit+0x1614/0x16b0 net/bridge/br_device.c:99
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 neigh_resolve_output+0xab7/0xb50 net/core/neighbour.c:1487
 neigh_output include/net/neighbour.h:508 [inline]
 ip_finish_output2+0x1709/0x1930 net/ipv4/ip_output.c:229
 ip_finish_output+0xd2a/0xfd0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x541/0x610 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x8a7/0xdd0 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x2ed5/0x3290 net/ipv4/ip_tunnel.c:831
 __gre_xmit net/ipv4/ip_gre.c:449 [inline]
 ipgre_xmit+0xffc/0x1130 net/ipv4/ip_gre.c:633
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 packet_snd net/packet/af_packet.c:2936 [inline]
 packet_sendmsg+0x815b/0x8f80 net/packet/af_packet.c:2961
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:208 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:223 [inline]
 kmsan_internal_chain_origin+0x133/0x230 mm/kmsan/kmsan.c:429
 kmsan_memcpy_memmove_metadata+0x969/0xd40 mm/kmsan/kmsan.c:307
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:327
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:139
 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478
 __skb_cow include/linux/skbuff.h:3029 [inline]
 skb_cow_head include/linux/skbuff.h:3063 [inline]
 gre_tap_xmit+0x79c/0xb80 net/ipv4/ip_gre.c:709
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 sch_direct_xmit+0x571/0x870 net/sched/sch_generic.c:328
 qdisc_restart net/sched/sch_generic.c:391 [inline]
 __qdisc_run+0x158b/0x3380 net/sched/sch_generic.c:399
 qdisc_run include/net/pkt_sched.h:121 [inline]
 __dev_xmit_skb net/core/dev.c:3487 [inline]
 __dev_queue_xmit+0x21a0/0x3b60 net/core/dev.c:3846
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 br_dev_queue_push_xmit+0x803/0x8b0 net/bridge/br_forward.c:56
 NF_HOOK include/linux/netfilter.h:289 [inline]
 br_forward_finish net/bridge/br_forward.c:69 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 __br_forward+0xa2a/0xe10 net/bridge/br_forward.c:113
 deliver_clone net/bridge/br_forward.c:129 [inline]
 maybe_deliver net/bridge/br_forward.c:184 [inline]
 br_flood+0xc65/0x10b0 net/bridge/br_forward.c:226
 br_dev_xmit+0x1614/0x16b0 net/bridge/br_device.c:99
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 neigh_resolve_output+0xab7/0xb50 net/core/neighbour.c:1487
 neigh_output include/net/neighbour.h:508 [inline]
 ip_finish_output2+0x1709/0x1930 net/ipv4/ip_output.c:229
 ip_finish_output+0xd2a/0xfd0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x541/0x610 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x8a7/0xdd0 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x2ed5/0x3290 net/ipv4/ip_tunnel.c:831
 __gre_xmit net/ipv4/ip_gre.c:449 [inline]
 ipgre_xmit+0xffc/0x1130 net/ipv4/ip_gre.c:633
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 packet_snd net/packet/af_packet.c:2936 [inline]
 packet_sendmsg+0x815b/0x8f80 net/packet/af_packet.c:2961
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:208 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:223 [inline]
 kmsan_internal_chain_origin+0x133/0x230 mm/kmsan/kmsan.c:429
 kmsan_memcpy_memmove_metadata+0x969/0xd40 mm/kmsan/kmsan.c:307
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:327
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:139
 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478
 __skb_cow include/linux/skbuff.h:3029 [inline]
 skb_cow_head include/linux/skbuff.h:3063 [inline]
 ip_tunnel_xmit+0x2bd5/0x3290 net/ipv4/ip_tunnel.c:824
 __gre_xmit net/ipv4/ip_gre.c:449 [inline]
 ipgre_xmit+0xffc/0x1130 net/ipv4/ip_gre.c:633
 __netdev_start_xmit include/linux/netdevice.h:4414 [inline]
 netdev_start_xmit include/linux/netdevice.h:4423 [inline]
 xmit_one net/core/dev.c:3292 [inline]
 dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308
 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911
 packet_snd net/packet/af_packet.c:2936 [inline]
 packet_sendmsg+0x815b/0x8f80 net/packet/af_packet.c:2961
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:208 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:162
 kmsan_kmalloc+0xa4/0x130 mm/kmsan/kmsan_hooks.c:175
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:184
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slub.c:2771 [inline]
 __kmalloc_node_track_caller+0xcba/0xf30 mm/slub.c:4399
 __kmalloc_reserve net/core/skbuff.c:140 [inline]
 __alloc_skb+0x306/0xa10 net/core/skbuff.c:208
 alloc_skb include/linux/skbuff.h:1059 [inline]
 alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5295
 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2220
 packet_alloc_skb net/packet/af_packet.c:2784 [inline]
 packet_snd net/packet/af_packet.c:2879 [inline]
 packet_sendmsg+0x6422/0x8f80 net/packet/af_packet.c:2961
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:661 [inline]
 ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260
 __sys_sendmsg net/socket.c:2298 [inline]
 __do_sys_sendmsg net/socket.c:2307 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2305
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================