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BUG: KMSAN: uninit-value in skb_gso_segment include/net/gso.h:83 [inline]
BUG: KMSAN: uninit-value in validate_xmit_skb+0x10fa/0x1b90 net/core/dev.c:3959
 skb_gso_segment include/net/gso.h:83 [inline]
 validate_xmit_skb+0x10fa/0x1b90 net/core/dev.c:3959
 validate_xmit_skb_list+0xd4/0x320 net/core/dev.c:4009
 sch_direct_xmit+0xd4/0xcf0 net/sched/sch_generic.c:329
 __dev_xmit_skb net/core/dev.c:4114 [inline]
 __dev_queue_xmit+0x3588/0x5e60 net/core/dev.c:4691
 dev_queue_xmit include/linux/netdevice.h:3361 [inline]
 packet_xmit+0x8f/0x710 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3130 [inline]
 packet_sendmsg+0x9172/0xa2a0 net/packet/af_packet.c:3162
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x330/0x3d0 net/socket.c:729
 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2614
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2703
 x64_sys_call+0x1dfd/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:47
 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 stored to memory at:
 validate_xmit_vlan net/core/dev.c:3876 [inline]
 validate_xmit_skb+0x10f3/0x1b90 net/core/dev.c:3948
 validate_xmit_skb_list+0xd4/0x320 net/core/dev.c:4009
 sch_direct_xmit+0xd4/0xcf0 net/sched/sch_generic.c:329
 __dev_xmit_skb net/core/dev.c:4114 [inline]
 __dev_queue_xmit+0x3588/0x5e60 net/core/dev.c:4691
 dev_queue_xmit include/linux/netdevice.h:3361 [inline]
 packet_xmit+0x8f/0x710 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3130 [inline]
 packet_sendmsg+0x9172/0xa2a0 net/packet/af_packet.c:3162
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x330/0x3d0 net/socket.c:729
 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2614
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2703
 x64_sys_call+0x1dfd/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:47
 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
 packet_alloc_skb net/packet/af_packet.c:2980 [inline]
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x743c/0xa2a0 net/packet/af_packet.c:3162
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x330/0x3d0 net/socket.c:729
 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2614
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2703
 x64_sys_call+0x1dfd/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:47
 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: 1 UID: 0 PID: 6092 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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