================================================================== BUG: KMSAN: uninit-value in __read_once_size include/linux/compiler.h:197 [inline] BUG: KMSAN: uninit-value in hlist_empty include/linux/list.h:641 [inline] BUG: KMSAN: uninit-value in sk_head include/net/sock.h:552 [inline] BUG: KMSAN: uninit-value in raw6_local_deliver+0x137/0x1fe0 net/ipv6/raw.c:239 CPU: 1 PID: 31123 Comm: syz-executor2 Not tainted 4.17.0+ #22 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+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:990 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:640 __read_once_size include/linux/compiler.h:197 [inline] hlist_empty include/linux/list.h:641 [inline] sk_head include/net/sock.h:552 [inline] raw6_local_deliver+0x137/0x1fe0 net/ipv6/raw.c:239 ip6_input_finish+0x561/0x2260 net/ipv6/ip6_input.c:246 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_input net/ipv6/ip6_input.c:327 [inline] ip6_mc_input+0xa65/0x10a0 net/ipv6/ip6_input.c:404 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x498/0x6e0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0x1d6b/0x2360 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x47f3/0x4aa0 net/core/dev.c:4592 __netif_receive_skb net/core/dev.c:4657 [inline] process_backlog+0x62d/0xe20 net/core/dev.c:5337 napi_poll net/core/dev.c:5735 [inline] net_rx_action+0x766/0x1a80 net/core/dev.c:5801 __do_softirq+0x592/0x979 kernel/softirq.c:285 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1054 do_softirq+0xb6/0xf0 kernel/softirq.c:329 netif_rx_ni net/core/dev.c:4219 [inline] dev_loopback_xmit+0x8d4/0x930 net/core/dev.c:3347 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_finish_output2+0x1e19/0x2100 net/ipv6/ip6_output.c:84 ip6_fragment+0x32bb/0x5160 net/ipv6/ip6_output.c:743 ip6_finish_output+0xa14/0xbb0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip6_output+0x597/0x6c0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:176 ip6_send_skb+0xfa/0x380 net/ipv6/ip6_output.c:1703 udp_v6_send_skb+0x12a3/0x18e0 net/ipv6/udp.c:1063 udpv6_sendmsg+0x3e35/0x3f40 net/ipv6/udp.c:1335 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg net/socket.c:639 [inline] ___sys_sendmsg+0xec8/0x1320 net/socket.c:2117 __sys_sendmsg net/socket.c:2155 [inline] __do_sys_sendmsg net/socket.c:2164 [inline] __se_sys_sendmsg net/socket.c:2162 [inline] __x64_sys_sendmsg+0x331/0x460 net/socket.c:2162 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455e29 RSP: 002b:00007f0cc413fc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0cc41406d4 RCX: 0000000000455e29 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c1165 R14: 00000000004d15d0 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+0x12b/0x210 mm/kmsan/kmsan.c:581 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:425 kmsan_memmove_origins+0x9/0x10 mm/kmsan/kmsan.c:480 __msan_memmove+0xda/0x130 mm/kmsan/kmsan_instr.c:381 ip6_frag_reasm net/ipv6/reassembly.c:418 [inline] ip6_frag_queue net/ipv6/reassembly.c:314 [inline] ipv6_frag_rcv+0x4ee9/0x6810 net/ipv6/reassembly.c:527 ip6_input_finish+0x1353/0x2260 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_input net/ipv6/ip6_input.c:327 [inline] ip6_mc_input+0xa65/0x10a0 net/ipv6/ip6_input.c:404 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x498/0x6e0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0x1d6b/0x2360 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x47f3/0x4aa0 net/core/dev.c:4592 __netif_receive_skb net/core/dev.c:4657 [inline] process_backlog+0x62d/0xe20 net/core/dev.c:5337 napi_poll net/core/dev.c:5735 [inline] net_rx_action+0x766/0x1a80 net/core/dev.c:5801 __do_softirq+0x592/0x979 kernel/softirq.c:285 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+0x94/0x100 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:2753 [inline] __kmalloc_node_track_caller+0xb35/0x11b0 mm/slub.c:4395 __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:5254 sock_alloc_send_pskb+0xb56/0x11a0 net/core/sock.c:2088 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2105 __ip6_append_data+0x34cc/0x4fb0 net/ipv6/ip6_output.c:1427 ip6_make_skb+0x87a/0x1100 net/ipv6/ip6_output.c:1783 udpv6_sendmsg+0x3d5e/0x3f40 net/ipv6/udp.c:1329 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg net/socket.c:639 [inline] ___sys_sendmsg+0xec8/0x1320 net/socket.c:2117 __sys_sendmsg net/socket.c:2155 [inline] __do_sys_sendmsg net/socket.c:2164 [inline] __se_sys_sendmsg net/socket.c:2162 [inline] __x64_sys_sendmsg+0x331/0x460 net/socket.c:2162 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================