IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2112 [inline]
BUG: KMSAN: uninit-value in ipv6_gso_pull_exthdrs net/ipv6/ip6_offload.c:47 [inline]
BUG: KMSAN: uninit-value in ipv6_gso_segment+0xa72/0x1d90 net/ipv6/ip6_offload.c:87
CPU: 0 PID: 6922 Comm: syz-executor0 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
 pskb_may_pull include/linux/skbuff.h:2112 [inline]
 ipv6_gso_pull_exthdrs net/ipv6/ip6_offload.c:47 [inline]
 ipv6_gso_segment+0xa72/0x1d90 net/ipv6/ip6_offload.c:87
 skb_mac_gso_segment+0x420/0x7b0 net/core/dev.c:2793
 nsh_gso_segment+0x658/0x1340 net/nsh/nsh.c:111
 skb_mac_gso_segment+0x420/0x7b0 net/core/dev.c:2793
 __skb_gso_segment+0x757/0xa40 net/core/dev.c:2866
 skb_gso_segment include/linux/netdevice.h:4038 [inline]
 validate_xmit_skb+0xc30/0x1320 net/core/dev.c:3119
 __dev_queue_xmit+0x2370/0x3540 net/core/dev.c:3576
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617
 packet_snd net/packet/af_packet.c:2953 [inline]
 packet_sendmsg+0x818b/0x8cc0 net/packet/af_packet.c:2978
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg net/socket.c:639 [inline]
 __sys_sendto+0x6c4/0x7e0 net/socket.c:1789
 __do_sys_sendto net/socket.c:1801 [inline]
 __se_sys_sendto net/socket.c:1797 [inline]
 __x64_sys_sendto+0x1a1/0x210 net/socket.c:1797
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ba9
RSP: 002b:00007fee39922c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fee399236d4 RCX: 0000000000455ba9
RDX: 0000000000000012 RSI: 0000000020000000 RDI: 0000000000000014
RBP: 000000000072bf48 R08: 00000000200000c0 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c1202 R14: 00000000004d1428 R15: 0000000000000001

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_alloc_meta_for_pages+0x146/0x700 mm/kmsan/kmsan.c:702
 kmsan_alloc_page+0x75/0xd0 mm/kmsan/kmsan_hooks.c:250
 __alloc_pages_nodemask+0xf7b/0x5cc0 mm/page_alloc.c:4404
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 alloc_slab_page mm/slub.c:1467 [inline]
 allocate_slab mm/slub.c:1612 [inline]
 new_slab+0x349/0x1b50 mm/slub.c:1683
 new_slab_objects mm/slub.c:2464 [inline]
 ___slab_alloc+0x1516/0x1f50 mm/slub.c:2616
 __slab_alloc mm/slub.c:2656 [inline]
 slab_alloc_node mm/slub.c:2719 [inline]
 __kmalloc_node+0x941/0x1200 mm/slub.c:3859
 kmalloc_node include/linux/slab.h:554 [inline]
 kvmalloc_node+0x197/0x2f0 mm/util.c:421
 kvmalloc include/linux/mm.h:550 [inline]
 seq_buf_alloc fs/seq_file.c:32 [inline]
 seq_read+0x510/0x2270 fs/seq_file.c:211
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0x884/0xd80 fs/read_write.c:924
 vfs_readv+0x1ec/0x260 fs/read_write.c:986
 kernel_readv fs/splice.c:361 [inline]
 default_file_splice_read+0xc31/0x1160 fs/splice.c:416
 do_splice_to fs/splice.c:880 [inline]
 splice_direct_to_actor+0x4cb/0x1040 fs/splice.c:952
 do_splice_direct+0x335/0x540 fs/splice.c:1061
 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440
 __do_sys_sendfile64 fs/read_write.c:1495 [inline]
 __se_sys_sendfile64 fs/read_write.c:1487 [inline]
 __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================