===================================================== 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+0xb29/0x13d0 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:5979 [inline] __netif_receive_skb+0x312/0xac0 net/core/dev.c:6092 process_backlog+0x485/0xa00 net/core/dev.c:6444 __napi_poll+0xdd/0x8a0 net/core/dev.c:7497 napi_poll net/core/dev.c:7560 [inline] net_rx_action+0xa59/0x1ac0 net/core/dev.c:7687 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:4740 dev_queue_xmit include/linux/netdevice.h:3358 [inline] neigh_resolve_output+0x9c5/0xaf0 net/core/neighbour.c:1595 neigh_output include/net/neighbour.h:547 [inline] ip_finish_output2+0x1abc/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_mc_output+0x58a/0x8d0 net/ipv4/ip_output.c:420 dst_output include/net/dst.h:461 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0x1ffa/0x2050 net/ipv4/ip_output.c:527 sctp_v4_xmit+0x684/0x1120 net/sctp/protocol.c:1091 sctp_packet_transmit+0x438c/0x46d0 net/sctp/output.c:653 sctp_packet_singleton+0x2e3/0x450 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x71c/0x67c0 net/sctp/outqueue.c:1212 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a6a/0x2260 net/sctp/socket.c:1842 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x278/0x3d0 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: pskb_expand_head+0x310/0x1610 net/core/skbuff.c:2248 skb_expand_head+0x499/0x8e0 net/core/skbuff.c:2412 ip_finish_output2+0xe48/0x1d50 net/ipv4/ip_output.c:216 __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_mc_output+0x58a/0x8d0 net/ipv4/ip_output.c:420 dst_output include/net/dst.h:461 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0x1ffa/0x2050 net/ipv4/ip_output.c:527 sctp_v4_xmit+0x684/0x1120 net/sctp/protocol.c:1091 sctp_packet_transmit+0x438c/0x46d0 net/sctp/output.c:653 sctp_packet_singleton+0x2e3/0x450 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x71c/0x67c0 net/sctp/outqueue.c:1212 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a6a/0x2260 net/sctp/socket.c:1842 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x278/0x3d0 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] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_node_track_caller_noprof+0x96d/0x12f0 mm/slub.c:4384 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:600 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:669 alloc_skb include/linux/skbuff.h:1336 [inline] sctp_packet_transmit+0x44b/0x46d0 net/sctp/output.c:598 sctp_packet_singleton+0x2e3/0x450 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x71c/0x67c0 net/sctp/outqueue.c:1212 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a6a/0x2260 net/sctp/socket.c:1842 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x278/0x3d0 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: 21013 Comm: syz.6.3948 Tainted: G W 6.16.0-syzkaller-12016-gbec077162bd0 #0 PREEMPT(none) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 =====================================================