================================================================== BUG: KMSAN: uninit-value in ip_tunnel_xmit+0x63a/0x3b10 net/ipv4/ip_tunnel.c:645 CPU: 1 PID: 6733 Comm: syz-executor7 Not tainted 4.18.0-rc4+ #27 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x185/0x1e0 lib/dump_stack.c:113 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:982 __msan_warning+0x7d/0xe0 mm/kmsan/kmsan_instr.c:645 ip_tunnel_xmit+0x63a/0x3b10 net/ipv4/ip_tunnel.c:645 __gre_xmit net/ipv4/ip_gre.c:449 [inline] ipgre_xmit+0xe16/0xef0 net/ipv4/ip_gre.c:701 __netdev_start_xmit include/linux/netdevice.h:4148 [inline] netdev_start_xmit include/linux/netdevice.h:4157 [inline] xmit_one net/core/dev.c:3034 [inline] dev_hard_start_xmit+0x60f/0xcc0 net/core/dev.c:3050 __dev_queue_xmit+0x3060/0x3c70 net/core/dev.c:3569 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3602 packet_snd net/packet/af_packet.c:2919 [inline] packet_sendmsg+0x8469/0x9010 net/packet/af_packet.c:2944 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg net/socket.c:651 [inline] ___sys_sendmsg+0xed9/0x1350 net/socket.c:2125 __sys_sendmsg net/socket.c:2163 [inline] __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x3b0/0x520 net/socket.c:2170 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb96d2a0c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb96d2a16d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000020001540 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c1066 R14: 00000000004d16c8 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:181 kmsan_kmalloc+0xa1/0x120 mm/kmsan/kmsan_hooks.c:91 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2720 [inline] __kmalloc_node_track_caller+0xb48/0x11d0 mm/slub.c:4353 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:988 [inline] alloc_skb_with_frags+0x1e6/0xb80 net/core/skbuff.c:5271 sock_alloc_send_pskb+0xb59/0x11e0 net/core/sock.c:2095 packet_alloc_skb net/packet/af_packet.c:2776 [inline] packet_snd net/packet/af_packet.c:2867 [inline] packet_sendmsg+0x68cb/0x9010 net/packet/af_packet.c:2944 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg net/socket.c:651 [inline] ___sys_sendmsg+0xed9/0x1350 net/socket.c:2125 __sys_sendmsg net/socket.c:2163 [inline] __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x3b0/0x520 net/socket.c:2170 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================