===================================================== BUG: KMSAN: uninit-value in ip_rcv_core+0xf4c/0x1480 syzkaller/managers/upstream-kmsan-gce/kernel/net/ipv4/ip_input.c:476 CPU: 1 PID: 8488 Comm: syz-executor640 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/upstream-kmsan-gce/kernel/lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 syzkaller/managers/upstream-kmsan-gce/kernel/lib/dump_stack.c:118 kmsan_report+0xfb/0x1e0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan_instr.c:197 ip_rcv_core+0xf4c/0x1480 syzkaller/managers/upstream-kmsan-gce/kernel/net/ipv4/ip_input.c:476 ip_rcv+0xc7/0x820 syzkaller/managers/upstream-kmsan-gce/kernel/net/ipv4/ip_input.c:535 __netif_receive_skb_one_core syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:5315 [inline] __netif_receive_skb+0x1ec/0x640 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:5429 process_backlog+0x517/0xbd0 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:6319 napi_poll+0x40a/0x1020 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:6763 net_rx_action+0x34c/0xd30 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:6833 __do_softirq+0x1a9/0x6fa syzkaller/managers/upstream-kmsan-gce/kernel/kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack syzkaller/managers/upstream-kmsan-gce/kernel/./arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond syzkaller/managers/upstream-kmsan-gce/kernel/./arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x6e/0x90 syzkaller/managers/upstream-kmsan-gce/kernel/arch/x86/kernel/irq_64.c:77 do_softirq syzkaller/managers/upstream-kmsan-gce/kernel/kernel/softirq.c:343 [inline] __local_bh_enable_ip+0x184/0x1d0 syzkaller/managers/upstream-kmsan-gce/kernel/kernel/softirq.c:195 local_bh_enable+0x36/0x40 syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/bottom_half.h:32 rcu_read_unlock_bh syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/rcupdate.h:730 [inline] __dev_queue_xmit+0x3b3e/0x4590 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:4167 dev_queue_xmit+0x4b/0x60 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:4173 packet_snd syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:2992 [inline] packet_sendmsg+0x8778/0x9a60 syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:3017 sock_sendmsg_nosec syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:651 [inline] sock_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:671 [inline] __sys_sendto+0x9dc/0xc80 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:1992 __do_sys_sendto syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2004 [inline] __se_sys_sendto+0x107/0x130 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2000 __x64_sys_sendto+0x6e/0x90 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2000 do_syscall_64+0x9f/0x140 syzkaller/managers/upstream-kmsan-gce/kernel/arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x443839 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:00007ffc7ad08ef8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443839 RDX: 000000000000000e RSI: 0000000020000080 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00000000200002c0 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc7ad08f20 R13: 00000000000f4240 R14: 0000000000023eef R15: 00007ffc7ad08f14 Uninit was stored to memory at: kmsan_save_stack_with_flags syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan.c:121 [inline] kmsan_internal_chain_origin+0xad/0x130 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan.c:289 __msan_chain_origin+0x57/0xa0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan_instr.c:147 iptunnel_xmit+0xbd6/0xf20 syzkaller/managers/upstream-kmsan-gce/kernel/net/ipv4/ip_tunnel_core.c:76 udp_tunnel_xmit_skb+0x526/0x640 syzkaller/managers/upstream-kmsan-gce/kernel/net/ipv4/udp_tunnel_core.c:190 geneve_xmit_skb syzkaller/managers/upstream-kmsan-gce/kernel/drivers/net/geneve.c:959 [inline] geneve_xmit+0x209e/0x3c20 syzkaller/managers/upstream-kmsan-gce/kernel/drivers/net/geneve.c:1059 __netdev_start_xmit syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/netdevice.h:4718 [inline] netdev_start_xmit syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/netdevice.h:4732 [inline] xmit_one+0x2b6/0x760 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:3564 dev_hard_start_xmit syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:3580 [inline] __dev_queue_xmit+0x3426/0x4590 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:4140 dev_queue_xmit+0x4b/0x60 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/dev.c:4173 packet_snd syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:2992 [inline] packet_sendmsg+0x8778/0x9a60 syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:3017 sock_sendmsg_nosec syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:651 [inline] sock_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:671 [inline] __sys_sendto+0x9dc/0xc80 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:1992 __do_sys_sendto syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2004 [inline] __se_sys_sendto+0x107/0x130 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2000 __x64_sys_sendto+0x6e/0x90 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2000 do_syscall_64+0x9f/0x140 syzkaller/managers/upstream-kmsan-gce/kernel/arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: kmsan_save_stack_with_flags syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 syzkaller/managers/upstream-kmsan-gce/kernel/mm/kmsan/kmsan_hooks.c:76 slab_alloc_node syzkaller/managers/upstream-kmsan-gce/kernel/mm/slub.c:2906 [inline] __kmalloc_node_track_caller+0xa48/0x1610 syzkaller/managers/upstream-kmsan-gce/kernel/mm/slub.c:4512 __kmalloc_reserve syzkaller/managers/upstream-kmsan-gce/kernel/net/core/skbuff.c:142 [inline] __alloc_skb+0x318/0xb00 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/skbuff.c:210 alloc_skb syzkaller/managers/upstream-kmsan-gce/kernel/./include/linux/skbuff.h:1094 [inline] alloc_skb_with_frags+0x1f3/0xc10 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/skbuff.c:5832 sock_alloc_send_pskb+0xcc4/0xe80 syzkaller/managers/upstream-kmsan-gce/kernel/net/core/sock.c:2329 packet_alloc_skb syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:2840 [inline] packet_snd syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:2935 [inline] packet_sendmsg+0x6aab/0x9a60 syzkaller/managers/upstream-kmsan-gce/kernel/net/packet/af_packet.c:3017 sock_sendmsg_nosec syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:651 [inline] sock_sendmsg syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:671 [inline] __sys_sendto+0x9dc/0xc80 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:1992 __do_sys_sendto syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2004 [inline] __se_sys_sendto+0x107/0x130 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2000 __x64_sys_sendto+0x6e/0x90 syzkaller/managers/upstream-kmsan-gce/kernel/net/socket.c:2000 do_syscall_64+0x9f/0x140 syzkaller/managers/upstream-kmsan-gce/kernel/arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================