BUG: unable to handle kernel paging request at ffff8800fffffffc
PGD c316067 P4D c316067 PUD 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 27034 Comm: syz-executor4 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 
RSP: 0018:ffff88021fc0f500 EFLAGS: 00010082
RAX: ffff880100000000 RBX: 0000000000000000 RCX: 0000000100160038
RDX: 0000000000000400 RSI: ffff88021fff2000 RDI: 0000000000000400
RBP: ffff88021fc0f568 R08: ffffffff7fffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffffc
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  00007fd586f0f700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8800fffffffc CR3: 00000001070b4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __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+0x2a1/0x340 net/ipv6/ip6_input.c:327
 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
 </IRQ>
 do_softirq kernel/softirq.c:332 [inline]
 __local_bh_enable_ip+0x134/0x170 kernel/softirq.c:185
 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
 pppol2tp_sendmsg+0x7c7/0xc90 net/l2tp/l2tp_ppp.c:342
 sock_sendmsg_nosec net/socket.c:641 [inline]
 sock_sendmsg net/socket.c:651 [inline]
 sock_write_iter+0x408/0x4d0 net/socket.c:920
 call_write_iter include/linux/fs.h:1793 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x87e/0xb90 fs/read_write.c:487
 vfs_write+0x467/0x8c0 fs/read_write.c:549
 ksys_write fs/read_write.c:598 [inline]
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x1cf/0x400 fs/read_write.c:607
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
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:00007fd586f0ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd586f0f6d4 RCX: 0000000000455ab9
RDX: 000000000000ffe3 RSI: 0000000020000300 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c01e3 R14: 00000000004d4470 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: ffff8800fffffffc
---[ end trace d6263d9de6e7f01e ]---
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:ffff88021fc0f500 EFLAGS: 00010082
RAX: ffff880100000000 RBX: 0000000000000000 RCX: 0000000100160038
RDX: 0000000000000400 RSI: ffff88021fff2000 RDI: 0000000000000400
RBP: ffff88021fc0f568 R08: ffffffff7fffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffffc
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
FS:  00007fd586f0f700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8800fffffffc CR3: 00000001070b4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400