=====================================================
BUG: KMSAN: uninit-value in eth_skb_pkt_type include/linux/etherdevice.h:629 [inline]
BUG: KMSAN: uninit-value in eth_type_trans+0x840/0xae0 net/ethernet/eth.c:165
 eth_skb_pkt_type include/linux/etherdevice.h:629 [inline]
 eth_type_trans+0x840/0xae0 net/ethernet/eth.c:165
 ip_tunnel_rcv+0x215f/0x29c0 net/ipv4/ip_tunnel.c:439
 erspan_rcv net/ipv4/ip_gre.c:356 [inline]
 gre_rcv+0x1c9f/0x20e0 net/ipv4/ip_gre.c:460
 gre_rcv+0x2af/0x3e0 net/ipv4/gre_demux.c:163
 ip_protocol_deliver_rcu+0xb3d/0x13d0 net/ipv4/ip_input.c:207
 ip_local_deliver_finish+0x409/0x720 net/ipv4/ip_input.c:241
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_local_deliver+0x228/0x4a0 net/ipv4/ip_input.c:262
 dst_input include/net/dst.h:480 [inline]
 ip_rcv_finish+0x4d7/0x560 net/ipv4/ip_input.c:492
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_rcv+0xcb/0x370 net/ipv4/ip_input.c:612
 __netif_receive_skb_one_core net/core/dev.c:6202 [inline]
 __netif_receive_skb net/core/dev.c:6315 [inline]
 process_backlog+0x8d7/0x1500 net/core/dev.c:6666
 __napi_poll+0xdc/0x910 net/core/dev.c:7733
 napi_poll net/core/dev.c:7796 [inline]
 net_rx_action+0xa5b/0x1c70 net/core/dev.c:7953
 handle_softirqs+0x171/0x7b0 kernel/softirq.c:622
 __do_softirq+0x14/0x1b kernel/softirq.c:656
 do_softirq+0x58/0x90 kernel/softirq.c:523
 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:912 [inline]
 __dev_queue_xmit+0x3c88/0x5a00 net/core/dev.c:4905
 dev_queue_xmit include/linux/netdevice.h:3418 [inline]
 neigh_resolve_output+0x9c3/0xaf0 net/core/neighbour.c:1619
 neigh_output include/net/neighbour.h:560 [inline]
 ip_finish_output2+0x1afd/0x1e00 net/ipv4/ip_output.c:237
 __ip_finish_output net/ipv4/ip_output.c:-1 [inline]
 ip_finish_output+0x288/0x860 net/ipv4/ip_output.c:325
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip_mc_output+0x58a/0x8c0 net/ipv4/ip_output.c:422
 dst_output include/net/dst.h:470 [inline]
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 ip_send_skb+0x392/0x3d0 net/ipv4/ip_output.c:1510
 udp_send_skb+0xfb8/0x1480 net/ipv4/udp.c:1161
 udp_sendmsg+0x2635/0x30d0 net/ipv4/udp.c:1443
 inet_sendmsg+0x1ef/0x290 net/ipv4/af_inet.c:866
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0xd27/0xfd0 net/socket.c:2699
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2753
 __sys_sendmmsg+0x3bf/0x7c0 net/socket.c:2835
 __compat_sys_sendmmsg net/compat.c:360 [inline]
 __do_compat_sys_sendmmsg net/compat.c:367 [inline]
 __se_compat_sys_sendmmsg net/compat.c:364 [inline]
 __ia32_compat_sys_sendmmsg+0xd2/0x160 net/compat.c:364
 ia32_sys_call+0x27d6/0x4360 arch/x86/include/generated/asm/syscalls_32.h:346
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x195/0x470 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4577 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 kmem_cache_alloc_node_noprof+0x3cd/0x12c0 mm/slub.c:4951
 kmalloc_reserve net/core/skbuff.c:613 [inline]
 __alloc_skb+0x855/0x1190 net/core/skbuff.c:713
 alloc_skb include/linux/skbuff.h:1385 [inline]
 alloc_skb_with_frags+0xc5/0x990 net/core/skbuff.c:6766
 sock_alloc_send_pskb+0xacb/0xc60 net/core/sock.c:3007
 sock_alloc_send_skb include/net/sock.h:1898 [inline]
 __ip_append_data+0x4b1e/0x6d70 net/ipv4/ip_output.c:1127
 ip_make_skb+0x1de/0x5f0 net/ipv4/ip_output.c:1576
 udp_sendmsg+0x2577/0x30d0 net/ipv4/udp.c:1438
 inet_sendmsg+0x1ef/0x290 net/ipv4/af_inet.c:866
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0xd27/0xfd0 net/socket.c:2699
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2753
 __sys_sendmmsg+0x3bf/0x7c0 net/socket.c:2835
 __compat_sys_sendmmsg net/compat.c:360 [inline]
 __do_compat_sys_sendmmsg net/compat.c:367 [inline]
 __se_compat_sys_sendmmsg net/compat.c:364 [inline]
 __ia32_compat_sys_sendmmsg+0xd2/0x160 net/compat.c:364
 ia32_sys_call+0x27d6/0x4360 arch/x86/include/generated/asm/syscalls_32.h:346
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x195/0x470 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 1 UID: 0 PID: 8111 Comm: syz.6.722 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
=====================================================