================================================================== BUG: KMSAN: uninit-value in __read_once_size include/linux/compiler.h:200 [inline] BUG: KMSAN: uninit-value in ip_idents_reserve net/ipv4/route.c:484 [inline] BUG: KMSAN: uninit-value in __ip_select_ident+0x476/0x7c0 net/ipv4/route.c:512 CPU: 0 PID: 7537 Comm: syz-executor.1 Not tainted 5.1.0-rc7+ #5 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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x130/0x2a0 mm/kmsan/kmsan.c:619 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:310 __read_once_size include/linux/compiler.h:200 [inline] ip_idents_reserve net/ipv4/route.c:484 [inline] __ip_select_ident+0x476/0x7c0 net/ipv4/route.c:512 iptunnel_xmit+0x84e/0xdd0 net/ipv4/ip_tunnel_core.c:89 ip_tunnel_xmit+0x2ed5/0x3290 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:449 [inline] ipgre_xmit+0xffc/0x1130 net/ipv4/ip_gre.c:633 __netdev_start_xmit include/linux/netdevice.h:4414 [inline] netdev_start_xmit include/linux/netdevice.h:4423 [inline] xmit_one net/core/dev.c:3292 [inline] dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911 packet_snd net/packet/af_packet.c:2932 [inline] packet_sendmsg+0x8195/0x90c0 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260 __sys_sendmsg net/socket.c:2298 [inline] __do_sys_sendmsg net/socket.c:2307 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2305 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x458da9 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffb00b33c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffb00b346d4 R13: 00000000004c6630 R14: 00000000004daf58 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x133/0x230 mm/kmsan/kmsan.c:426 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:200 iptunnel_xmit+0xad9/0xdd0 net/ipv4/ip_tunnel_core.c:86 ip_tunnel_xmit+0x2ed5/0x3290 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:449 [inline] ipgre_xmit+0xffc/0x1130 net/ipv4/ip_gre.c:633 __netdev_start_xmit include/linux/netdevice.h:4414 [inline] netdev_start_xmit include/linux/netdevice.h:4423 [inline] xmit_one net/core/dev.c:3292 [inline] dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911 packet_snd net/packet/af_packet.c:2932 [inline] packet_sendmsg+0x8195/0x90c0 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260 __sys_sendmsg net/socket.c:2298 [inline] __do_sys_sendmsg net/socket.c:2307 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2305 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x133/0x230 mm/kmsan/kmsan.c:426 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:200 ip_tunnel_init_flow include/net/ip_tunnels.h:248 [inline] ip_tunnel_xmit+0x9e8/0x3290 net/ipv4/ip_tunnel.c:748 __gre_xmit net/ipv4/ip_gre.c:449 [inline] ipgre_xmit+0xffc/0x1130 net/ipv4/ip_gre.c:633 __netdev_start_xmit include/linux/netdevice.h:4414 [inline] netdev_start_xmit include/linux/netdevice.h:4423 [inline] xmit_one net/core/dev.c:3292 [inline] dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911 packet_snd net/packet/af_packet.c:2932 [inline] packet_sendmsg+0x8195/0x90c0 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260 __sys_sendmsg net/socket.c:2298 [inline] __do_sys_sendmsg net/socket.c:2307 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2305 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x133/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0x969/0xd40 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:139 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478 __skb_cow include/linux/skbuff.h:3029 [inline] skb_cow_head include/linux/skbuff.h:3063 [inline] ipgre_xmit+0x6df/0x1130 net/ipv4/ip_gre.c:612 __netdev_start_xmit include/linux/netdevice.h:4414 [inline] netdev_start_xmit include/linux/netdevice.h:4423 [inline] xmit_one net/core/dev.c:3292 [inline] dev_hard_start_xmit+0x594/0xb20 net/core/dev.c:3308 __dev_queue_xmit+0x2e01/0x3b60 net/core/dev.c:3878 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3911 packet_snd net/packet/af_packet.c:2932 [inline] packet_sendmsg+0x8195/0x90c0 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260 __sys_sendmsg net/socket.c:2298 [inline] __do_sys_sendmsg net/socket.c:2307 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2305 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305 do_syscall_64+0xbc/0xf0 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:205 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159 kmsan_kmalloc+0xa4/0x130 mm/kmsan/kmsan_hooks.c:174 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:183 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slub.c:2771 [inline] __kmalloc_node_track_caller+0xcba/0xf30 mm/slub.c:4399 __kmalloc_reserve net/core/skbuff.c:140 [inline] __alloc_skb+0x306/0xa10 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1059 [inline] alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5295 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2220 packet_alloc_skb net/packet/af_packet.c:2782 [inline] packet_snd net/packet/af_packet.c:2875 [inline] packet_sendmsg+0x6404/0x90c0 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xcc6/0x1200 net/socket.c:2260 __sys_sendmsg net/socket.c:2298 [inline] __do_sys_sendmsg net/socket.c:2307 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2305 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2305 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================