BUG: unable to handle kernel paging request at ffff8800fffffffc
PGD c316067 P4D c316067 PUD 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 16064 Comm: syz-executor2 Not tainted 4.18.0-rc4+ #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_memmove_origins+0x13e/0x1d0 mm/kmsan/kmsan.c:456
Code: ff ff 48 83 7d d0 04 72 1d be 04 00 00 00 ba 01 00 00 00 31 c9 48 8b 7d b0 e8 ce e9 ff ff 48 85 c0 74 03 44 8b 28 48 8b 45 a0 <46> 8b 3c 20 45 85 ff 74 1f 45 85 ed 74 1a 41 39 df 74 15 be 01 00 
IPVS: ftp: loaded support on port[0] = 21
RSP: 0018:ffff880101faf120 EFLAGS: 00010086
RAX: ffff880100000000 RBX: 0000000000000000 RCX: 0000000100018078
RDX: 0000000000000400 RSI: ffff88021fff2000 RDI: 0000000000000400
RBP: ffff880101faf188 R08: ffffffff7fffffff R09: ffffffffffffffff
R10: ffffffffffffffff R11: ffffffffffffffff R12: fffffffffffffffc
R13: 0000000000000000 R14: 0000000000000002 R15: 00000000e98000bf
FS:  00007fb424827700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8800fffffffc CR3: 0000000101c84000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000020000040 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __msan_memmove+0xe7/0x150 mm/kmsan/kmsan_instr.c:381
 nf_ct_frag6_reasm net/ipv6/netfilter/nf_conntrack_reasm.c:432 [inline]
 nf_ct_frag6_gather+0x436a/0x5870 net/ipv6/netfilter/nf_conntrack_reasm.c:586
 ipv6_defrag+0x501/0x5c0 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:71
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0x15d/0x3e0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:242 [inline]
 NF_HOOK include/linux/netfilter.h:285 [inline]
 ipv6_rcv+0x1df5/0x2250 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]
 netif_receive_skb_internal+0x475/0x660 net/core/dev.c:4767
 netif_receive_skb+0x246/0x270 net/core/dev.c:4791
 tun_rx_batched drivers/net/tun.c:1571 [inline]
 tun_get_user+0x80f6/0x89c0 drivers/net/tun.c:1981
 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:2009
 do_iter_readv_writev+0x81a/0xac0 include/linux/fs.h:1787
 do_iter_write+0x30d/0xd50 fs/read_write.c:959
 vfs_writev fs/read_write.c:1004 [inline]
 do_writev+0x3d8/0x860 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0xe1/0x120 fs/read_write.c:1109
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455971
Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 54 bb fb ff c3 48 83 ec 08 e8 da 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 23 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 
RSP: 002b:00007fb424826ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000046 RCX: 0000000000455971
RDX: 0000000000000001 RSI: 00007fb424826bf0 RDI: 00000000000000fc
RBP: 0000000020000700 R08: 00000000000000fc R09: 0000000000000000
R10: 0000000000000046 R11: 0000000000000293 R12: 00000000ffffffff
R13: 00000000004c20a6 R14: 00000000004d3ae0 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: ffff8800fffffffc
---[ end trace 67bb9b9649d43a3a ]---
RIP: 0010:kmsan_memmove_origins+0x13e/0x1d0 mm/kmsan/kmsan.c:456
Code: ff ff 48 83 7d d0 04 72 1d be 04 00 00 00 ba 01 00 00 00 31 c9 48 8b 7d b0 e8 ce e9 ff ff 48 85 c0 74 03 44 8b 28 48 8b 45 a0 <46> 8b 3c 20 45 85 ff 74 1f 45 85 ed 74 1a 41 39 df 74 15 be 01 00 
RSP: 0018:ffff880101faf120 EFLAGS: 00010086
RAX: ffff880100000000 RBX: 0000000000000000 RCX: 0000000100018078
RDX: 0000000000000400 RSI: ffff88021fff2000 RDI: 0000000000000400
RBP: ffff880101faf188 R08: ffffffff7fffffff R09: ffffffffffffffff
R10: ffffffffffffffff R11: ffffffffffffffff R12: fffffffffffffffc
R13: 0000000000000000 R14: 0000000000000002 R15: 00000000e98000bf
FS:  00007fb424827700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8800fffffffc CR3: 0000000101c84000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000020000040 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600