=====================================================
BUG: KMSAN: uninit-value in eth_skb_pkt_type include/linux/etherdevice.h:628 [inline]
BUG: KMSAN: uninit-value in eth_type_trans+0x7d5/0x9b0 net/ethernet/eth.c:165
 eth_skb_pkt_type include/linux/etherdevice.h:628 [inline]
 eth_type_trans+0x7d5/0x9b0 net/ethernet/eth.c:165
 ip_tunnel_rcv+0x2d98/0x3610 net/ipv4/ip_tunnel.c:439
 erspan_rcv net/ipv4/ip_gre.c:354 [inline]
 gre_rcv+0x1c8c/0x20e0 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:207
 ip_local_deliver_finish+0x409/0x730 net/ipv4/ip_input.c:241
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_local_deliver+0x228/0x4b0 net/ipv4/ip_input.c:262
 dst_input include/net/dst.h:474 [inline]
 ip_rcv_finish+0x4f7/0x5c0 net/ipv4/ip_input.c:453
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_rcv+0xcb/0x380 net/ipv4/ip_input.c:573
 __netif_receive_skb_one_core net/core/dev.c:6137 [inline]
 __netif_receive_skb+0x312/0xac0 net/core/dev.c:6250
 process_backlog+0x47c/0x9f0 net/core/dev.c:6602
 __napi_poll+0xd8/0x880 net/core/dev.c:7666
 napi_poll net/core/dev.c:7729 [inline]
 net_rx_action+0xa3f/0x1c90 net/core/dev.c:7881
 handle_softirqs+0x169/0x6e0 kernel/softirq.c:622
 __do_softirq+0x14/0x1b kernel/softirq.c:656
 do_softirq+0x99/0x100 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:936 [inline]
 __dev_queue_xmit+0x3c32/0x58f0 net/core/dev.c:4844
 dev_queue_xmit include/linux/netdevice.h:3381 [inline]
 neigh_resolve_output+0x9c5/0xaf0 net/core/neighbour.c:1594
 neigh_output include/net/neighbour.h:556 [inline]
 ip_finish_output2+0x1abf/0x1d50 net/ipv4/ip_output.c:237
 __ip_finish_output net/ipv4/ip_output.c:-1 [inline]
 ip_finish_output+0x292/0x8e0 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:464 [inline]
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 __ip_queue_xmit+0x1fdc/0x2140 net/ipv4/ip_output.c:534
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:548
 __tcp_transmit_skb+0x420a/0x4c90 net/ipv4/tcp_output.c:1631
 tcp_transmit_skb net/ipv4/tcp_output.c:1649 [inline]
 tcp_write_xmit+0x37a7/0x92f0 net/ipv4/tcp_output.c:3002
 __tcp_push_pending_frames+0xc5/0x3c0 net/ipv4/tcp_output.c:3185
 tcp_push+0x7dc/0x840 net/ipv4/tcp.c:775
 tcp_sendmsg_locked+0x6980/0x7680 net/ipv4/tcp.c:1375
 tcp_sendmsg+0x4b/0x90 net/ipv4/tcp.c:1412
 inet_sendmsg+0x134/0x2a0 net/ipv4/af_inet.c:859
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x278/0x3d0 net/socket.c:742
 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg+0x1aa/0x300 net/socket.c:2678
 __compat_sys_sendmsg net/compat.c:346 [inline]
 __do_compat_sys_sendmsg net/compat.c:353 [inline]
 __se_compat_sys_sendmsg net/compat.c:350 [inline]
 __ia32_compat_sys_sendmsg+0xa4/0x100 net/compat.c:350
 ia32_sys_call+0x35f2/0x4340 arch/x86/include/generated/asm/syscalls_32.h:371
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x155/0x310 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x38/0x80 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:4960 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315
 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586
 __alloc_skb+0x866/0x10a0 net/core/skbuff.c:690
 alloc_skb_fclone include/linux/skbuff.h:1433 [inline]
 tcp_stream_alloc_skb+0x4c/0x5f0 net/ipv4/tcp.c:910
 tcp_sendmsg_locked+0x1db5/0x7680 net/ipv4/tcp.c:1217
 tcp_sendmsg+0x4b/0x90 net/ipv4/tcp.c:1412
 inet_sendmsg+0x134/0x2a0 net/ipv4/af_inet.c:859
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x278/0x3d0 net/socket.c:742
 ____sys_sendmsg+0x7f5/0xcf0 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg+0x1aa/0x300 net/socket.c:2678
 __compat_sys_sendmsg net/compat.c:346 [inline]
 __do_compat_sys_sendmsg net/compat.c:353 [inline]
 __se_compat_sys_sendmsg net/compat.c:350 [inline]
 __ia32_compat_sys_sendmsg+0xa4/0x100 net/compat.c:350
 ia32_sys_call+0x35f2/0x4340 arch/x86/include/generated/asm/syscalls_32.h:371
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x155/0x310 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x38/0x80 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: 9020 Comm: syz.6.993 Tainted: G             L      syzkaller #0 PREEMPT(none) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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