=====================================================
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_output+0x14f/0x3e0 net/ipv4/ip_output.c:438
 dst_output include/net/dst.h:470 [inline]
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 __ip_queue_xmit+0x1f82/0x20b0 net/ipv4/ip_output.c:534
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:548
 __tcp_transmit_skb+0x4d3c/0x5fe0 net/ipv4/tcp_output.c:1715
 tcp_transmit_skb net/ipv4/tcp_output.c:1733 [inline]
 tcp_write_xmit+0x4e9a/0xa0b0 net/ipv4/tcp_output.c:3061
 __tcp_push_pending_frames+0xc5/0x3c0 net/ipv4/tcp_output.c:3244
 tcp_sendmsg_locked+0x5ab4/0x80b0 net/ipv4/tcp.c:1393
 tcp_sendmsg+0x4b/0x90 net/ipv4/tcp.c:1452
 inet_sendmsg+0x134/0x290 net/ipv4/af_inet.c:866
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 sock_write_iter+0x667/0x7e0 net/socket.c:1254
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0xbe1/0x15c0 fs/read_write.c:688
 ksys_write+0x1d9/0x470 fs/read_write.c:740
 __do_sys_write fs/read_write.c:751 [inline]
 __se_sys_write fs/read_write.c:748 [inline]
 __ia32_sys_write+0x9a/0xf0 fs/read_write.c:748
 ia32_sys_call+0x37a7/0x4360 arch/x86/include/generated/asm/syscalls_32.h:5
 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
 skb_segment+0x23ae/0x7a90 net/core/skbuff.c:4936
 tcp_gso_segment+0xaaa/0x2d20 net/ipv4/tcp_offload.c:181
 tcp4_gso_segment+0xe28/0x1c10 net/ipv4/tcp_offload.c:130
 inet_gso_segment+0xd92/0x1f00 net/ipv4/af_inet.c:1414
 skb_mac_gso_segment+0x425/0x890 net/core/gso.c:53
 __skb_gso_segment+0x695/0x8b0 net/core/gso.c:124
 skb_gso_segment include/net/gso.h:83 [inline]
 validate_xmit_skb+0x1255/0x2400 net/core/dev.c:4039
 validate_xmit_skb_list+0xd4/0x320 net/core/dev.c:4089
 sch_direct_xmit+0xd4/0xcf0 net/sched/sch_generic.c:357
 __dev_xmit_skb net/core/dev.c:4209 [inline]
 __dev_queue_xmit+0x3592/0x5a00 net/core/dev.c:4831
 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_output+0x14f/0x3e0 net/ipv4/ip_output.c:438
 dst_output include/net/dst.h:470 [inline]
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 __ip_queue_xmit+0x1f82/0x20b0 net/ipv4/ip_output.c:534
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:548
 __tcp_transmit_skb+0x4d3c/0x5fe0 net/ipv4/tcp_output.c:1715
 tcp_transmit_skb net/ipv4/tcp_output.c:1733 [inline]
 tcp_write_xmit+0x4e9a/0xa0b0 net/ipv4/tcp_output.c:3061
 __tcp_push_pending_frames+0xc5/0x3c0 net/ipv4/tcp_output.c:3244
 tcp_sendmsg_locked+0x5ab4/0x80b0 net/ipv4/tcp.c:1393
 tcp_sendmsg+0x4b/0x90 net/ipv4/tcp.c:1452
 inet_sendmsg+0x134/0x290 net/ipv4/af_inet.c:866
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 sock_write_iter+0x667/0x7e0 net/socket.c:1254
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0xbe1/0x15c0 fs/read_write.c:688
 ksys_write+0x1d9/0x470 fs/read_write.c:740
 __do_sys_write fs/read_write.c:751 [inline]
 __se_sys_write fs/read_write.c:748 [inline]
 __ia32_sys_write+0x9a/0xf0 fs/read_write.c:748
 ia32_sys_call+0x37a7/0x4360 arch/x86/include/generated/asm/syscalls_32.h:5
 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: 19564 Comm: syz.4.3684 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
=====================================================