Not allocated shadow for addr ffff8801d413c000 (page ffffea000af87680)
Attempted to access 4096 bytes
------------[ cut here ]------------
kernel BUG at mm/kmsan/kmsan.c:1326!
invalid opcode: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4513 Comm: sshd Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 mm/kmsan/kmsan.c:1325
RSP: 0018:ffff8801c12ee648 EFLAGS: 00010082
RAX: 000000000000001e RBX: 0000000000000740 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffff8801c12ee660 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d413c000
R13: 0000000000001eb6 R14: 0000000000000001 R15: 0000000000001000
FS:  00007efeacffe7c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002001d000 CR3: 0000000199fca000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 kmsan_internal_memset_shadow mm/kmsan/kmsan.c:171 [inline]
 kmsan_internal_unpoison_shadow+0x5c/0xe0 mm/kmsan/kmsan.c:208
 kmsan_unpoison_shadow+0x66/0xb0 mm/kmsan/kmsan.c:222
 virtqueue_get_buf_ctx+0x742/0xa20 drivers/virtio/virtio_ring.c:760
 virtqueue_get_buf+0x72/0x90 drivers/virtio/virtio_ring.c:767
 free_old_xmit_skbs drivers/net/virtio_net.c:1230 [inline]
 start_xmit+0x293/0x29a0 drivers/net/virtio_net.c:1388
 __netdev_start_xmit include/linux/netdevice.h:4066 [inline]
 netdev_start_xmit include/linux/netdevice.h:4075 [inline]
 xmit_one net/core/dev.c:3026 [inline]
 dev_hard_start_xmit+0x5f1/0xc70 net/core/dev.c:3042
 sch_direct_xmit+0x540/0x8f0 net/sched/sch_generic.c:327
 qdisc_restart net/sched/sch_generic.c:399 [inline]
 __qdisc_run+0x1785/0x3730 net/sched/sch_generic.c:410
 __dev_xmit_skb net/core/dev.c:3217 [inline]
 __dev_queue_xmit+0x1d50/0x3520 net/core/dev.c:3525
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3590
 neigh_hh_output include/net/neighbour.h:472 [inline]
 neigh_output include/net/neighbour.h:480 [inline]
 ip_finish_output2+0x12a1/0x1470 net/ipv4/ip_output.c:229
 ip_finish_output+0xcb2/0xff0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 ip_queue_xmit+0x1a1e/0x1d10 net/ipv4/ip_output.c:504
 tcp_transmit_skb+0x3d81/0x53d0 net/ipv4/tcp_output.c:1176
 tcp_write_xmit+0x3911/0xb920 net/ipv4/tcp_output.c:2394
 __tcp_push_pending_frames+0x124/0x3f0 net/ipv4/tcp_output.c:2567
 tcp_push+0x8b6/0x9c0 net/ipv4/tcp.c:726
 tcp_sendmsg_locked+0x5450/0x6cf0 net/ipv4/tcp.c:1426
 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1463
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 sock_write_iter+0x3b9/0x470 net/socket.c:909
 call_write_iter include/linux/fs.h:1782 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x7fb/0x9f0 fs/read_write.c:482
 vfs_write+0x463/0x8d0 fs/read_write.c:544
 SYSC_write+0x172/0x360 fs/read_write.c:589
 SyS_write+0x55/0x80 fs/read_write.c:581
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x7efeab399370
RSP: 002b:00007fffb0a477c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000004028 RCX: 00007efeab399370
RDX: 0000000000004028 RSI: 000055f8e394e220 RDI: 0000000000000003
RBP: 000055f8e394e220 R08: 0000000000000001 R09: 20676e6974756365
R10: 0a6d6172676f7270 R11: 0000000000000246 R12: 00007fffb0a4782c
R13: 000055f8e1df0fb4 R14: 0000000000000028 R15: 000055f8e1df2ca0
Code: 75 29 48 c7 c7 fd 92 7d 8a 31 c0 e8 4d 68 86 ff 80 3c 25 e8 03 2c 8b 00 75 11 48 c7 c7 2d 93 7d 8a 31 c0 4c 89 fe e8 32 68 86 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 
RIP: kmsan_get_shadow_address+0x1ce/0x1f0 mm/kmsan/kmsan.c:1325 RSP: ffff8801c12ee648
---[ end trace 6457cbe5844e1350 ]---