===================================================== BUG: KMSAN: uninit-value in memcmp lib/string.c:778 [inline] BUG: KMSAN: uninit-value in bcmp+0x14e/0x290 lib/string.c:810 memcmp lib/string.c:778 [inline] bcmp+0x14e/0x290 lib/string.c:810 ip6frag_obj_cmpfn+0x93/0x110 include/net/ipv6_frag.h:60 __rhashtable_lookup include/linux/rhashtable.h:601 [inline] rhashtable_lookup include/linux/rhashtable.h:638 [inline] inet_frag_find+0x591/0x2a60 net/ipv4/inet_fragment.c:362 fq_find net/ipv6/reassembly.c:99 [inline] ipv6_frag_rcv+0x180a/0x4370 net/ipv6/reassembly.c:374 ip6_protocol_deliver_rcu+0xe7c/0x2ab0 net/ipv6/ip6_input.c:422 ip6_input_finish net/ipv6/ip6_input.c:463 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip6_input+0x130/0x390 net/ipv6/ip6_input.c:472 ip6_mc_input+0xcab/0xef0 net/ipv6/ip6_input.c:566 dst_input include/net/dst.h:460 [inline] ip6_rcv_finish+0x670/0x850 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:307 [inline] ipv6_rcv+0x1d1/0x460 net/ipv6/ip6_input.c:297 __netif_receive_skb_one_core net/core/dev.c:5465 [inline] __netif_receive_skb+0x1ec/0x630 net/core/dev.c:5579 process_backlog+0x54b/0xc10 net/core/dev.c:6455 __napi_poll+0x14c/0xc00 net/core/dev.c:7023 napi_poll net/core/dev.c:7090 [inline] net_rx_action+0x7e2/0x1820 net/core/dev.c:7177 __do_softirq+0x1ee/0x7c5 kernel/softirq.c:558 do_softirq+0x16d/0x220 kernel/softirq.c:459 netif_rx_ni+0xb6/0x410 net/core/dev.c:4973 dev_loopback_xmit+0x7cb/0x8d0 net/core/dev.c:3927 NF_HOOK include/linux/netfilter.h:307 [inline] ip6_finish_output2+0x69b/0x2c50 net/ipv6/ip6_output.c:92 ip6_fragment+0x2c5e/0x4210 net/ipv6/ip6_output.c:907 __ip6_finish_output+0xca4/0x10a0 net/ipv6/ip6_output.c:189 ip6_finish_output+0x15c/0x4d0 net/ipv6/ip6_output.c:201 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x4ac/0x7f0 net/ipv6/ip6_output.c:224 dst_output include/net/dst.h:450 [inline] ip6_local_out+0x180/0x1f0 net/ipv6/output_core.c:161 ip6_send_skb+0xf8/0x3f0 net/ipv6/ip6_output.c:1912 udp_v6_send_skb+0x1441/0x2200 net/ipv6/udp.c:1249 udpv6_sendmsg+0x4c5a/0x4f40 net/ipv6/udp.c:1547 inet6_sendmsg+0x15b/0x1d0 net/ipv6/af_inet6.c:644 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmmsg+0x845/0xf60 net/socket.c:2542 __compat_sys_sendmmsg net/compat.c:361 [inline] __do_compat_sys_sendmmsg net/compat.c:368 [inline] __se_compat_sys_sendmmsg net/compat.c:365 [inline] __ia32_compat_sys_sendmmsg+0x127/0x180 net/compat.c:365 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline] __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Local variable key.i created at: fq_find net/ipv6/reassembly.c:86 [inline] ipv6_frag_rcv+0x1648/0x4370 net/ipv6/reassembly.c:374 ip6_protocol_deliver_rcu+0xe7c/0x2ab0 net/ipv6/ip6_input.c:422 CPU: 0 PID: 14123 Comm: syz-executor.5 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================