ip (3760) used greatest stack depth: 54672 bytes left
ip (3809) used greatest stack depth: 54312 bytes left
Not allocated shadow for addr ffff8801dcac8000 (page ffffea000b2c0b00)
Attempted to access 486 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: 1 PID: 3584 Comm: syz-fuzzer Not tainted 4.16.0+ #81
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:ffff8801a8d6e638 EFLAGS: 00010086
RAX: 000000000000001d RBX: 0000000000000760 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffff8801a8d6e650 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801dcac8000
R13: 00000000000001e6 R14: 0000000000000001 R15: 00000000000001e6
FS:  000000c420088ae8(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff7821be80 CR3: 00000001d56bc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0x276/0x2840 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+0x174a/0x2b60 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+0x1198/0x1380 net/ipv4/ip_output.c:229
 ip_finish_output+0xcb0/0xff0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_output+0x502/0x5c0 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+0x1fae/0x21c0 net/ipv4/ip_output.c:504
 tcp_transmit_skb+0x38be/0x51f0 net/ipv4/tcp_output.c:1176
 tcp_write_xmit+0x4311/0xb920 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+0x5445/0x6d20 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+0x719/0x910 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: 0033:0x47fc44
RSP: 002b:000000c42b5db340 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fc44
RDX: 00000000000000a7 RSI: 000000c4294db000 RDI: 0000000000000003
RBP: 000000c42b5db390 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000040 R14: 0000000000000005 R15: 000000c4201ba4e0
Code: 75 29 48 c7 c7 71 2a a1 87 31 c0 e8 0d 11 86 ff 80 3c 25 a8 a4 2d 88 00 75 11 48 c7 c7 a1 2a a1 87 31 c0 4c 89 fe e8 f2 10 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: ffff8801a8d6e638
---[ end trace e57424dd430a58ff ]---