================================================================== 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:557 [inline] BUG: KMSAN: uninit-value in raw6_local_deliver+0x147/0x2040 net/ipv6/raw.c:239 CPU: 1 PID: 13310 Comm: syz-executor5 Not tainted 4.18.0-rc4+ #23 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+0x185/0x1e0 lib/dump_stack.c:113 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:990 __msan_warning_32+0x7d/0xe0 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:557 [inline] raw6_local_deliver+0x147/0x2040 net/ipv6/raw.c:239 ip6_input_finish+0x571/0x22b0 net/ipv6/ip6_input.c:246 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_input net/ipv6/ip6_input.c:327 [inline] ip6_mc_input+0xac3/0x1180 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:287 [inline] ipv6_rcv+0x1ea9/0x2250 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x4a7a/0x4fc0 net/core/dev.c:4628 __netif_receive_skb net/core/dev.c:4693 [inline] process_backlog+0x664/0xe60 net/core/dev.c:5373 napi_poll net/core/dev.c:5771 [inline] net_rx_action+0x799/0x1ae0 net/core/dev.c:5837 __do_softirq+0x55f/0x934 kernel/softirq.c:288 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1054 do_softirq+0xc3/0x110 kernel/softirq.c:332 netif_rx_ni net/core/dev.c:4255 [inline] dev_loopback_xmit+0x91a/0x990 net/core/dev.c:3332 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_finish_output2+0x1f63/0x2280 net/ipv6/ip6_output.c:84 ip6_fragment+0x333c/0x5240 net/ipv6/ip6_output.c:718 ip6_finish_output+0xa14/0xbb0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip6_output+0x5c5/0x710 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:1696 udp_v6_send_skb+0xfa1/0x1e20 net/ipv6/udp.c:1082 udpv6_sendmsg+0x45a2/0x4870 net/ipv6/udp.c:1382 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg net/socket.c:651 [inline] __sys_sendto+0x798/0x8e0 net/socket.c:1797 __do_sys_sendto net/socket.c:1809 [inline] __se_sys_sendto net/socket.c:1805 [inline] __x64_sys_sendto+0x1a1/0x210 net/socket.c:1805 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455e29 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6d7d5d9c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f6d7d5da6d4 RCX: 0000000000455e29 RDX: 0000000000001000 RSI: 0000000020000200 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000020000040 R09: 000000000000001c R10: 0000000000040000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c14fe R14: 00000000004d1a20 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+0x13c/0x240 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+0xe7/0x150 mm/kmsan/kmsan_instr.c:381 ip6_frag_reasm net/ipv6/reassembly.c:412 [inline] ip6_frag_queue net/ipv6/reassembly.c:308 [inline] ipv6_frag_rcv+0x5229/0x6a50 net/ipv6/reassembly.c:522 ip6_input_finish+0x1353/0x22b0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_input net/ipv6/ip6_input.c:327 [inline] ip6_mc_input+0xac3/0x1180 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:287 [inline] ipv6_rcv+0x1ea9/0x2250 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x4a7a/0x4fc0 net/core/dev.c:4628 __netif_receive_skb net/core/dev.c:4693 [inline] process_backlog+0x664/0xe60 net/core/dev.c:5373 napi_poll net/core/dev.c:5771 [inline] net_rx_action+0x799/0x1ae0 net/core/dev.c:5837 __do_softirq+0x55f/0x934 kernel/softirq.c:288 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:181 kmsan_kmalloc+0xa1/0x120 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:2720 [inline] __kmalloc_node_track_caller+0xb48/0x11d0 mm/slub.c:4353 __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:5271 sock_alloc_send_pskb+0xb59/0x11e0 net/core/sock.c:2095 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2112 __ip6_append_data+0x3ac7/0x5320 net/ipv6/ip6_output.c:1420 ip6_make_skb+0x6b6/0xd20 net/ipv6/ip6_output.c:1776 udpv6_sendmsg+0x428f/0x4870 net/ipv6/udp.c:1376 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg net/socket.c:651 [inline] __sys_sendto+0x798/0x8e0 net/socket.c:1797 __do_sys_sendto net/socket.c:1809 [inline] __se_sys_sendto net/socket.c:1805 [inline] __x64_sys_sendto+0x1a1/0x210 net/socket.c:1805 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================