===================================================== 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:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0xa5b/0x1c70 net/core/dev.c:7950 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:556 [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_queue_xmit+0x201e/0x20b0 net/ipv4/ip_output.c:534 sctp_v4_xmit+0x707/0x1240 net/sctp/protocol.c:1060 sctp_packet_transmit+0x42b2/0x4600 net/sctp/output.c:653 sctp_packet_singleton+0x2e3/0x440 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x708/0x6e20 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+0x9028/0x9b30 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a63/0x2240 net/sctp/socket.c:1840 sctp_sendmsg+0x38b2/0x5270 net/sctp/socket.c:2030 inet_sendmsg+0x25e/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:2698 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2752 __sys_sendmsg+0x1aa/0x300 net/socket.c:2784 __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+0x1e4a/0x4360 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+0x180/0x460 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 stored to memory at: pskb_expand_head+0x497/0x1a40 net/core/skbuff.c:2310 skb_expand_head+0x41c/0x870 net/core/skbuff.c:2458 ip_finish_output2+0xe38/0x1e00 net/ipv4/ip_output.c:218 __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_queue_xmit+0x201e/0x20b0 net/ipv4/ip_output.c:534 sctp_v4_xmit+0x707/0x1240 net/sctp/protocol.c:1060 sctp_packet_transmit+0x42b2/0x4600 net/sctp/output.c:653 sctp_packet_singleton+0x2e3/0x440 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x708/0x6e20 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+0x9028/0x9b30 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a63/0x2240 net/sctp/socket.c:1840 sctp_sendmsg+0x38b2/0x5270 net/sctp/socket.c:2030 inet_sendmsg+0x25e/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:2698 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2752 __sys_sendmsg+0x1aa/0x300 net/socket.c:2784 __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+0x1e4a/0x4360 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+0x180/0x460 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:4576 [inline] slab_alloc_node mm/slub.c:4898 [inline] __do_kmalloc_node mm/slub.c:5294 [inline] __kmalloc_node_track_caller_noprof+0x4f6/0x1750 mm/slub.c:5407 kmalloc_reserve net/core/skbuff.c:635 [inline] __alloc_skb+0x90d/0x1190 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] sctp_packet_transmit+0x44b/0x4600 net/sctp/output.c:598 sctp_packet_singleton+0x2e3/0x440 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x708/0x6e20 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+0x9028/0x9b30 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0xd4/0x100 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x1a63/0x2240 net/sctp/socket.c:1840 sctp_sendmsg+0x38b2/0x5270 net/sctp/socket.c:2030 inet_sendmsg+0x25e/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:2698 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2752 __sys_sendmsg+0x1aa/0x300 net/socket.c:2784 __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+0x1e4a/0x4360 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+0x180/0x460 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: 14387 Comm: syz.3.2375 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 =====================================================