IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KMSAN: uninit-value in ip6_parse_tlv+0x87f/0xc70 net/ipv6/exthdrs.c:159
CPU: 1 PID: 10186 Comm: syz-executor422 Not tainted 5.0.0-rc1+ #9
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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 ip6_parse_tlv+0x87f/0xc70 net/ipv6/exthdrs.c:159
 ipv6_destopt_rcv+0x5c1/0xdd0 net/ipv6/exthdrs.c:311
 ip6_protocol_deliver_rcu+0xb5a/0x23a0 net/ipv6/ip6_input.c:394
 ip6_input_finish net/ipv6/ip6_input.c:434 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip6_input+0x2b6/0x350 net/ipv6/ip6_input.c:443
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x4e7/0x6d0 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ipv6_rcv+0x34b/0x3f0 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core net/core/dev.c:4973 [inline]
 __netif_receive_skb net/core/dev.c:5083 [inline]
 netif_receive_skb_internal+0x5cd/0x9a0 net/core/dev.c:5186
 napi_frags_finish net/core/dev.c:5753 [inline]
 napi_gro_frags+0x1737/0x2950 net/core/dev.c:5827
 tun_get_user+0x55be/0x7190 drivers/net/tun.c:1972
 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:2017
 do_iter_readv_writev+0x985/0xba0 include/linux/fs.h:1856
 do_iter_write+0x304/0xdc0 fs/read_write.c:956
 vfs_writev fs/read_write.c:1001 [inline]
 do_writev+0x397/0x840 fs/read_write.c:1036
 __do_sys_writev fs/read_write.c:1109 [inline]
 __se_sys_writev+0x9b/0xb0 fs/read_write.c:1106
 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1106
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x441360
Code: 05 48 3d 01 f0 ff ff 0f 83 3d 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d b1 8c 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 14 0f fc ff c3 48 83 ec 08 e8 7a 2b 00 00
RSP: 002b:00007ffdef679c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007ffdef679cb0 RCX: 0000000000441360
RDX: 0000000000000001 RSI: 00007ffdef679cd0 RDI: 00000000000000f0
RBP: 00007ffdef679ca0 R08: 0000000000000100 R09: 00000000bb1414ac
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007ffdef679ca8 R14: 0000000000000000 R15: 0000000000000000

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+0x134/0x230 mm/kmsan/kmsan.c:426
 kmsan_memcpy_memmove_metadata+0xcf2/0xf10 mm/kmsan/kmsan.c:304
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324
 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139
 pskb_expand_head+0x34c/0x18f0 net/core/skbuff.c:1474
 skb_unclone include/linux/skbuff.h:1512 [inline]
 nf_ct_frag6_reasm net/ipv6/netfilter/nf_conntrack_reasm.c:369 [inline]
 nf_ct_frag6_gather+0x3936/0x5860 net/ipv6/netfilter/nf_conntrack_reasm.c:600
 ipv6_defrag+0x542/0x650 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:69
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0x176/0x3d0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 ipv6_rcv+0x26b/0x3f0 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core net/core/dev.c:4973 [inline]
 __netif_receive_skb net/core/dev.c:5083 [inline]
 netif_receive_skb_internal+0x5cd/0x9a0 net/core/dev.c:5186
 napi_frags_finish net/core/dev.c:5753 [inline]
 napi_gro_frags+0x1737/0x2950 net/core/dev.c:5827
 tun_get_user+0x55be/0x7190 drivers/net/tun.c:1972
 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:2017
 do_iter_readv_writev+0x985/0xba0 include/linux/fs.h:1856
 do_iter_write+0x304/0xdc0 fs/read_write.c:956
 vfs_writev fs/read_write.c:1001 [inline]
 do_writev+0x397/0x840 fs/read_write.c:1036
 __do_sys_writev fs/read_write.c:1109 [inline]
 __se_sys_writev+0x9b/0xb0 fs/read_write.c:1106
 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1106
 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+0x7a/0x130 mm/kmsan/kmsan.c:205
 kmsan_internal_alloc_meta_for_pages+0x113/0x580 mm/kmsan/kmsan_hooks.c:98
 kmsan_alloc_page+0x7e/0x100 mm/kmsan/kmsan_hooks.c:396
 __alloc_pages_nodemask+0x137b/0x5e30 mm/page_alloc.c:4572
 __alloc_pages include/linux/gfp.h:475 [inline]
 __alloc_pages_node include/linux/gfp.h:488 [inline]
 alloc_pages_node include/linux/gfp.h:502 [inline]
 __page_frag_cache_refill mm/page_alloc.c:4647 [inline]
 page_frag_alloc+0x3c1/0x980 mm/page_alloc.c:4677
 __napi_alloc_skb+0x194/0x980 net/core/skbuff.c:481
 napi_alloc_skb include/linux/skbuff.h:2729 [inline]
 page_to_skb+0x156/0x10d0 drivers/net/virtio_net.c:380
 receive_mergeable drivers/net/virtio_net.c:906 [inline]
 receive_buf+0x1525/0x81f0 drivers/net/virtio_net.c:1015
 virtnet_receive drivers/net/virtio_net.c:1304 [inline]
 virtnet_poll+0xddf/0x1c60 drivers/net/virtio_net.c:1391
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x78b/0x1a60 net/core/dev.c:6412
 __do_softirq+0x53f/0x93a kernel/softirq.c:293
==================================================================