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BUG: KMSAN: uninit-value in eth_skb_pkt_type include/linux/etherdevice.h:628 [inline]
BUG: KMSAN: uninit-value in eth_type_trans+0x7af/0x9a0 net/ethernet/eth.c:165
 eth_skb_pkt_type include/linux/etherdevice.h:628 [inline]
 eth_type_trans+0x7af/0x9a0 net/ethernet/eth.c:165
 ip_tunnel_rcv+0x2d7d/0x34f0 net/ipv4/ip_tunnel.c:439
 erspan_rcv net/ipv4/ip_gre.c:354 [inline]
 gre_rcv+0x1aad/0x2050 net/ipv4/ip_gre.c:458
 gre_rcv+0x285/0x380 net/ipv4/gre_demux.c:163
 ip_protocol_deliver_rcu+0xb2c/0x13d0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x409/0x730 net/ipv4/ip_input.c:239
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_local_deliver+0x228/0x4b0 net/ipv4/ip_input.c:260
 dst_input include/net/dst.h:471 [inline]
 ip_rcv_finish+0x4f7/0x5c0 net/ipv4/ip_input.c:454
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_rcv+0xcb/0x380 net/ipv4/ip_input.c:574
 __netif_receive_skb_one_core net/core/dev.c:5991 [inline]
 __netif_receive_skb+0x312/0xac0 net/core/dev.c:6104
 process_backlog+0x485/0xa00 net/core/dev.c:6456
 __napi_poll+0xda/0x8a0 net/core/dev.c:7506
 napi_poll net/core/dev.c:7569 [inline]
 net_rx_action+0xa59/0x1ac0 net/core/dev.c:7696
 handle_softirqs+0x166/0x6e0 kernel/softirq.c:579
 __do_softirq+0x14/0x1b kernel/softirq.c:613
 do_softirq+0x99/0x100 kernel/softirq.c:480
 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:407
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
 __dev_queue_xmit+0x2df9/0x5e60 net/core/dev.c:4752
 dev_queue_xmit include/linux/netdevice.h:3361 [inline]
 neigh_resolve_output+0x9c5/0xaf0 net/core/neighbour.c:1595
 neigh_output include/net/neighbour.h:547 [inline]
 ip_finish_output2+0x1abf/0x1d50 net/ipv4/ip_output.c:235
 __ip_finish_output net/ipv4/ip_output.c:-1 [inline]
 ip_finish_output+0x292/0x8e0 net/ipv4/ip_output.c:323
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip_output+0x14f/0x3e0 net/ipv4/ip_output.c:436
 dst_output include/net/dst.h:461 [inline]
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 ip_send_skb+0x344/0x420 net/ipv4/ip_output.c:1506
 udp_send_skb+0x1375/0x1cb0 net/ipv4/udp.c:1195
 udp_sendmsg+0x3023/0x3370 net/ipv4/udp.c:1484
 udpv6_sendmsg+0x1789/0x3fa0 net/ipv6/udp.c:1542
 inet6_sendmsg+0x1ef/0x2a0 net/ipv6/af_inet6.c:659
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x145/0x3d0 net/socket.c:729
 ____sys_sendmsg+0x893/0xd80 net/socket.c:2614
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668
 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2757
 __do_sys_sendmmsg net/socket.c:2784 [inline]
 __se_sys_sendmmsg net/socket.c:2781 [inline]
 __x64_sys_sendmmsg+0xc6/0x150 net/socket.c:2781
 x64_sys_call+0x21de/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4186 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4281
 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:578
 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:669
 alloc_skb include/linux/skbuff.h:1336 [inline]
 alloc_skb_with_frags+0xc5/0xa60 net/core/skbuff.c:6665
 sock_alloc_send_pskb+0xad8/0xc70 net/core/sock.c:2980
 sock_alloc_send_skb include/net/sock.h:1847 [inline]
 __ip_append_data+0x4e9f/0x7160 net/ipv4/ip_output.c:1125
 ip_make_skb+0x1df/0x5f0 net/ipv4/ip_output.c:1572
 udp_sendmsg+0x27dd/0x3370 net/ipv4/udp.c:1479
 udpv6_sendmsg+0x1789/0x3fa0 net/ipv6/udp.c:1542
 inet6_sendmsg+0x1ef/0x2a0 net/ipv6/af_inet6.c:659
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x145/0x3d0 net/socket.c:729
 ____sys_sendmsg+0x893/0xd80 net/socket.c:2614
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668
 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2757
 __do_sys_sendmmsg net/socket.c:2784 [inline]
 __se_sys_sendmmsg net/socket.c:2781 [inline]
 __x64_sys_sendmmsg+0xc6/0x150 net/socket.c:2781
 x64_sys_call+0x21de/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 15017 Comm: syz.0.2421 Tainted: G        W           syzkaller #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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