================================================================== BUG: KMSAN: uninit-value in ip_rcv_core+0xabd/0x1160 net/ipv4/ip_input.c:464 CPU: 0 PID: 6096 Comm: syz-executor1 Not tainted 4.19.0-rc3+ #45 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+0x14b/0x190 lib/dump_stack.c:113 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645 ip_rcv_core+0xabd/0x1160 net/ipv4/ip_input.c:464 ip_rcv+0xbb/0x6d0 net/ipv4/ip_input.c:521 __netif_receive_skb_one_core net/core/dev.c:4891 [inline] __netif_receive_skb net/core/dev.c:5001 [inline] process_backlog+0x752/0x10b0 net/core/dev.c:5807 napi_poll net/core/dev.c:6227 [inline] net_rx_action+0x723/0x19d0 net/core/dev.c:6293 __do_softirq+0x562/0x948 kernel/softirq.c:292 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1055 do_softirq kernel/softirq.c:336 [inline] __local_bh_enable_ip+0x119/0x150 kernel/softirq.c:189 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] __dev_queue_xmit+0x35a8/0x3ab0 net/core/dev.c:3829 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3835 packet_snd net/packet/af_packet.c:2925 [inline] packet_sendmsg+0x80ff/0x8c60 net/packet/af_packet.c:2950 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe70/0x1290 net/socket.c:2114 __sys_sendmsg net/socket.c:2152 [inline] __do_sys_sendmsg net/socket.c:2161 [inline] __se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x4572d9 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f519249dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f519249e6d4 RCX: 00000000004572d9 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4eb0 R14: 00000000004c93c4 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_save_stack mm/kmsan/kmsan.c:271 [inline] kmsan_internal_chain_origin+0x128/0x210 mm/kmsan/kmsan.c:573 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:482 iptunnel_xmit+0xa3c/0xd50 net/ipv4/ip_tunnel_core.c:85 ip_tunnel_xmit+0x33e1/0x3750 net/ipv4/ip_tunnel.c:778 __gre_xmit net/ipv4/ip_gre.c:449 [inline] ipgre_xmit+0xdcf/0xeb0 net/ipv4/ip_gre.c:703 __netdev_start_xmit include/linux/netdevice.h:4287 [inline] netdev_start_xmit include/linux/netdevice.h:4296 [inline] xmit_one net/core/dev.c:3216 [inline] dev_hard_start_xmit+0x5df/0xc20 net/core/dev.c:3232 __dev_queue_xmit+0x2f35/0x3ab0 net/core/dev.c:3802 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3835 packet_snd net/packet/af_packet.c:2925 [inline] packet_sendmsg+0x80ff/0x8c60 net/packet/af_packet.c:2950 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe70/0x1290 net/socket.c:2114 __sys_sendmsg net/socket.c:2152 [inline] __do_sys_sendmsg net/socket.c:2161 [inline] __se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181 kmsan_kmalloc+0x98/0x100 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:2718 [inline] __kmalloc_node_track_caller+0x9e7/0x1160 mm/slub.c:4351 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2f5/0x9e0 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:996 [inline] alloc_skb_with_frags+0x1d0/0xac0 net/core/skbuff.c:5276 sock_alloc_send_pskb+0xb47/0x1170 net/core/sock.c:2082 packet_alloc_skb net/packet/af_packet.c:2779 [inline] packet_snd net/packet/af_packet.c:2870 [inline] packet_sendmsg+0x6599/0x8c60 net/packet/af_packet.c:2950 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe70/0x1290 net/socket.c:2114 __sys_sendmsg net/socket.c:2152 [inline] __do_sys_sendmsg net/socket.c:2161 [inline] __se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================