Local variable description: ----res@__ip_dev_find Variable was created at: __ip_dev_find+0x9a/0x700 net/ipv4/devinet.c:150 ip_route_output_key_hash_rcu+0x4ac/0x3bb0 net/ipv4/route.c:2382 ================================================================== BUG: KMSAN: uninit-value in __skb_header_pointer include/linux/skbuff.h:3385 [inline] BUG: KMSAN: uninit-value in skb_header_pointer include/linux/skbuff.h:3398 [inline] BUG: KMSAN: uninit-value in ipv4_get_l4proto net/netfilter/nf_conntrack_core.c:297 [inline] BUG: KMSAN: uninit-value in get_l4proto+0x2d1/0x6f0 net/netfilter/nf_conntrack_core.c:353 CPU: 1 PID: 1912 Comm: syz-executor4 Not tainted 4.20.0-rc2+ #88 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+0x32d/0x480 lib/dump_stack.c:113 kmsan_report+0x19f/0x300 mm/kmsan/kmsan.c:911 __msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:415 __skb_header_pointer include/linux/skbuff.h:3385 [inline] skb_header_pointer include/linux/skbuff.h:3398 [inline] ipv4_get_l4proto net/netfilter/nf_conntrack_core.c:297 [inline] get_l4proto+0x2d1/0x6f0 net/netfilter/nf_conntrack_core.c:353 nf_conntrack_in+0x50e/0x1edd net/netfilter/nf_conntrack_core.c:1546 ipv4_conntrack_in+0x68/0x80 net/netfilter/nf_conntrack_proto.c:425 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x15c/0x3d0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0x256/0x740 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core net/core/dev.c:4941 [inline] __netif_receive_skb net/core/dev.c:5051 [inline] process_backlog+0x82b/0x11e0 net/core/dev.c:5855 napi_poll net/core/dev.c:6275 [inline] net_rx_action+0x98f/0x1d50 net/core/dev.c:6341 __do_softirq+0x721/0xc7f kernel/softirq.c:292 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1031 do_softirq kernel/softirq.c:337 [inline] __local_bh_enable_ip+0x228/0x260 kernel/softirq.c:189 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline] ip_finish_output2+0x1430/0x1560 net/ipv4/ip_output.c:231 ip_do_fragment+0x3686/0x3f10 net/ipv4/ip_output.c:678 ip_fragment+0x247/0x400 net/ipv4/ip_output.c:561 ip_finish_output+0x1056/0x10f0 net/ipv4/ip_output.c:315 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x55c/0x630 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:124 [inline] ip_send_skb+0x178/0x370 net/ipv4/ip_output.c:1441 udp_send_skb+0x1439/0x1920 net/ipv4/udp.c:829 udp_push_pending_frames net/ipv4/udp.c:857 [inline] udp_sendmsg+0x1496/0x4350 net/ipv4/udp.c:1148 udpv6_sendmsg+0x123e/0x4960 net/ipv6/udp.c:1203 inet_sendmsg+0x4e9/0x800 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] __sys_sendto+0x940/0xb80 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:1796 __x64_sys_sendto+0x6e/0x90 net/socket.c:1796 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457569 Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f47345d3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004 RBP: 000000000072bfa0 R08: 0000000020000140 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 00007f47345d46d4 R13: 00000000004c3c1d R14: 00000000004d5e98 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:252 [inline] kmsan_save_stack mm/kmsan/kmsan.c:267 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:569 __msan_chain_origin+0x6d/0xb0 mm/kmsan/kmsan_instr.c:292 ip_frag_reasm net/ipv4/ip_fragment.c:605 [inline] ip_frag_queue net/ipv4/ip_fragment.c:488 [inline] ip_defrag+0x5994/0x6840 net/ipv4/ip_fragment.c:688 nf_ct_ipv4_gather_frags net/ipv4/netfilter/nf_defrag_ipv4.c:34 [inline] ipv4_conntrack_defrag+0x608/0x760 net/ipv4/netfilter/nf_defrag_ipv4.c:89 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x15c/0x3d0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0x256/0x740 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core net/core/dev.c:4941 [inline] __netif_receive_skb net/core/dev.c:5051 [inline] process_backlog+0x82b/0x11e0 net/core/dev.c:5855 napi_poll net/core/dev.c:6275 [inline] net_rx_action+0x98f/0x1d50 net/core/dev.c:6341 __do_softirq+0x721/0xc7f kernel/softirq.c:292 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:252 [inline] kmsan_save_stack mm/kmsan/kmsan.c:267 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:569 __msan_chain_origin+0x6d/0xb0 mm/kmsan/kmsan_instr.c:292 __skb_clone+0x8bc/0xbe0 net/core/skbuff.c:855 skb_clone+0x5af/0x7b0 net/core/skbuff.c:1288 ip_frag_reasm net/ipv4/ip_fragment.c:530 [inline] ip_frag_queue net/ipv4/ip_fragment.c:488 [inline] ip_defrag+0x3511/0x6840 net/ipv4/ip_fragment.c:688 nf_ct_ipv4_gather_frags net/ipv4/netfilter/nf_defrag_ipv4.c:34 [inline] ipv4_conntrack_defrag+0x608/0x760 net/ipv4/netfilter/nf_defrag_ipv4.c:89 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x15c/0x3d0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0x256/0x740 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core net/core/dev.c:4941 [inline] __netif_receive_skb net/core/dev.c:5051 [inline] process_backlog+0x82b/0x11e0 net/core/dev.c:5855 napi_poll net/core/dev.c:6275 [inline] net_rx_action+0x98f/0x1d50 net/core/dev.c:6341 __do_softirq+0x721/0xc7f kernel/softirq.c:292 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:252 [inline] kmsan_save_stack mm/kmsan/kmsan.c:267 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:569 __msan_chain_origin+0x6d/0xb0 mm/kmsan/kmsan_instr.c:292 __pskb_pull include/linux/skbuff.h:2149 [inline] pskb_pull include/linux/skbuff.h:2155 [inline] ip_frag_queue net/ipv4/ip_fragment.c:404 [inline] ip_defrag+0x21a9/0x6840 net/ipv4/ip_fragment.c:688 nf_ct_ipv4_gather_frags net/ipv4/netfilter/nf_defrag_ipv4.c:34 [inline] ipv4_conntrack_defrag+0x608/0x760 net/ipv4/netfilter/nf_defrag_ipv4.c:89 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x15c/0x3d0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0x256/0x740 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core net/core/dev.c:4941 [inline] __netif_receive_skb net/core/dev.c:5051 [inline] process_backlog+0x82b/0x11e0 net/core/dev.c:5855 napi_poll net/core/dev.c:6275 [inline] net_rx_action+0x98f/0x1d50 net/core/dev.c:6341 __do_softirq+0x721/0xc7f kernel/softirq.c:292 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:252 [inline] kmsan_save_stack mm/kmsan/kmsan.c:267 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:569 __msan_chain_origin+0x6d/0xb0 mm/kmsan/kmsan_instr.c:292 __skb_pull include/linux/skbuff.h:2134 [inline] skb_pull_inline include/linux/skbuff.h:2139 [inline] eth_type_trans+0x610/0x9d0 net/ethernet/eth.c:166 ip_tunnel_rcv+0x1105/0x1c10 net/ipv4/ip_tunnel.c:429 erspan_rcv net/ipv4/ip_gre.c:328 [inline] gre_rcv+0x14d2/0x1900 net/ipv4/ip_gre.c:422 gre_rcv+0x2e6/0x3c0 net/ipv4/gre_demux.c:143 ip_local_deliver_finish+0x8d8/0xff0 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x44b/0x510 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish net/ipv4/ip_input.c:415 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0x6b6/0x740 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core net/core/dev.c:4941 [inline] __netif_receive_skb net/core/dev.c:5051 [inline] process_backlog+0x82b/0x11e0 net/core/dev.c:5855 napi_poll net/core/dev.c:6275 [inline] net_rx_action+0x98f/0x1d50 net/core/dev.c:6341 __do_softirq+0x721/0xc7f kernel/softirq.c:292 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:252 [inline] kmsan_save_stack mm/kmsan/kmsan.c:267 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:569 __msan_chain_origin+0x6d/0xb0 mm/kmsan/kmsan_instr.c:292 __skb_pull include/linux/skbuff.h:2134 [inline] skb_pull_rcsum+0x3d1/0x530 net/core/skbuff.c:3424 __iptunnel_pull_header+0x18c/0xcb0 net/ipv4/ip_tunnel_core.c:104 erspan_rcv net/ipv4/ip_gre.c:295 [inline] gre_rcv+0x7c2/0x1900 net/ipv4/ip_gre.c:422 gre_rcv+0x2e6/0x3c0 net/ipv4/gre_demux.c:143 ip_local_deliver_finish+0x8d8/0xff0 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x44b/0x510 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish net/ipv4/ip_input.c:415 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0x6b6/0x740 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core net/core/dev.c:4941 [inline] __netif_receive_skb net/core/dev.c:5051 [inline] process_backlog+0x82b/0x11e0 net/core/dev.c:5855 napi_poll net/core/dev.c:6275 [inline] net_rx_action+0x98f/0x1d50 net/core/dev.c:6341 __do_softirq+0x721/0xc7f kernel/softirq.c:292 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:252 [inline] kmsan_save_stack mm/kmsan/kmsan.c:267 [inline] kmsan_internal_chain_origin+0x136/0x240 mm/kmsan/kmsan.c:569 kmsan_memcpy_origins+0x13d/0x190 mm/kmsan/kmsan.c:393 __msan_memcpy+0x6f/0x80 mm/kmsan/kmsan_instr.c:242 pskb_expand_head+0x436/0x1d20 net/core/skbuff.c:1470 __skb_cow include/linux/skbuff.h:2948 [inline] skb_cow_head include/linux/skbuff.h:2982 [inline] ip_tunnel_xmit+0x35a3/0x3d90 net/ipv4/ip_tunnel.c:780 __gre_xmit net/ipv4/ip_gre.c:451 [inline] erspan_xmit+0x1bce/0x35d0 net/ipv4/ip_gre.c:749 __netdev_start_xmit include/linux/netdevice.h:4356 [inline] netdev_start_xmit include/linux/netdevice.h:4365 [inline] xmit_one net/core/dev.c:3252 [inline] dev_hard_start_xmit+0x6dc/0xde0 net/core/dev.c:3268 sch_direct_xmit+0x59b/0x890 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x1bac/0x3600 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:121 [inline] __dev_xmit_skb net/core/dev.c:3447 [inline] __dev_queue_xmit+0x2131/0x3e00 net/core/dev.c:3806 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3871 neigh_hh_output include/net/neighbour.h:474 [inline] neigh_output include/net/neighbour.h:482 [inline] ip_finish_output2+0x136d/0x1560 net/ipv4/ip_output.c:229 ip_do_fragment+0x3686/0x3f10 net/ipv4/ip_output.c:678 ip_fragment+0x247/0x400 net/ipv4/ip_output.c:561 ip_finish_output+0x1056/0x10f0 net/ipv4/ip_output.c:315 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x55c/0x630 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:124 [inline] ip_send_skb+0x178/0x370 net/ipv4/ip_output.c:1441 udp_send_skb+0x1439/0x1920 net/ipv4/udp.c:829 udp_push_pending_frames net/ipv4/udp.c:857 [inline] udp_sendmsg+0x1496/0x4350 net/ipv4/udp.c:1148 udpv6_sendmsg+0x123e/0x4960 net/ipv6/udp.c:1203 inet_sendmsg+0x4e9/0x800 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] __sys_sendto+0x940/0xb80 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:1796 __x64_sys_sendto+0x6e/0x90 net/socket.c:1796 do_syscall_64+0xcf/0x110 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:252 [inline] kmsan_internal_poison_shadow+0xc8/0x1c0 mm/kmsan/kmsan.c:177 kmsan_kmalloc+0x98/0xf0 mm/kmsan/kmsan_hooks.c:104 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:113 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2765 [inline] __kmalloc_node_track_caller+0xf62/0x14e0 mm/slub.c:4396 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x42b/0xeb0 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:998 [inline] __ip_append_data+0x2e00/0x4460 net/ipv4/ip_output.c:988 ip_append_data+0x30c/0x450 net/ipv4/ip_output.c:1196 udp_sendmsg+0x74e/0x4350 net/ipv4/udp.c:1142 udpv6_sendmsg+0x123e/0x4960 net/ipv6/udp.c:1203 inet_sendmsg+0x4e9/0x800 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] __sys_sendto+0x940/0xb80 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:1796 __x64_sys_sendto+0x6e/0x90 net/socket.c:1796 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================