===================================================== BUG: KMSAN: uninit-value in ip_rcv_core+0xf4c/0x1480 net/ipv4/ip_input.c:476 CPU: 0 PID: 8430 Comm: syz-executor626 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 ip_rcv_core+0xf4c/0x1480 net/ipv4/ip_input.c:476 ip_rcv+0xc7/0x820 net/ipv4/ip_input.c:535 __netif_receive_skb_one_core net/core/dev.c:5323 [inline] __netif_receive_skb+0x1ec/0x640 net/core/dev.c:5437 process_backlog+0x517/0xbd0 net/core/dev.c:6328 napi_poll+0x428/0x15c0 net/core/dev.c:6806 net_rx_action+0x34c/0xd30 net/core/dev.c:6889 __do_softirq+0x1b9/0x715 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77 do_softirq kernel/softirq.c:246 [inline] __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:196 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:737 [inline] __dev_queue_xmit+0x3b3e/0x45c0 net/core/dev.c:4178 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4184 packet_snd net/packet/af_packet.c:3006 [inline] packet_sendmsg+0x8778/0x9a60 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmsg+0x714/0x830 net/socket.c:2432 __do_sys_sendmsg net/socket.c:2441 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2439 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2439 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x443e39 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcd646cf88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443e39 RDX: 0000000000000000 RSI: 0000000020000b00 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000f0b5ff R09: 0000000000f0b5ff R10: 00007ffcd646ca00 R11: 0000000000000246 R12: 00007ffcd646cfc0 R13: 00007ffcd646cfb0 R14: 00007ffcd646cfa0 R15: 0000000000000003 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147 iptunnel_xmit+0xbd6/0xf20 net/ipv4/ip_tunnel_core.c:76 udp_tunnel_xmit_skb+0x526/0x640 net/ipv4/udp_tunnel_core.c:190 geneve_xmit_skb drivers/net/geneve.c:959 [inline] geneve_xmit+0x209e/0x3c20 drivers/net/geneve.c:1059 __netdev_start_xmit include/linux/netdevice.h:4778 [inline] netdev_start_xmit include/linux/netdevice.h:4792 [inline] xmit_one+0x2b6/0x760 net/core/dev.c:3574 dev_hard_start_xmit net/core/dev.c:3590 [inline] __dev_queue_xmit+0x3426/0x45c0 net/core/dev.c:4151 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4184 packet_snd net/packet/af_packet.c:3006 [inline] packet_sendmsg+0x8778/0x9a60 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmsg+0x714/0x830 net/socket.c:2432 __do_sys_sendmsg net/socket.c:2441 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2439 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2439 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2907 [inline] __kmalloc_node_track_caller+0xa37/0x1430 mm/slub.c:4527 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2f8/0xb30 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1099 [inline] alloc_skb_with_frags+0x1f3/0xc10 net/core/skbuff.c:5894 sock_alloc_send_pskb+0xdc1/0xf90 net/core/sock.c:2348 packet_alloc_skb net/packet/af_packet.c:2854 [inline] packet_snd net/packet/af_packet.c:2949 [inline] packet_sendmsg+0x6aab/0x9a60 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmsg+0x714/0x830 net/socket.c:2432 __do_sys_sendmsg net/socket.c:2441 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2439 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2439 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================