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kernel BUG at drivers/vhost/vhost.c:1652!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 14495 Comm: syz-executor5 Not tainted 4.16.0+ #380
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:set_bit_to_user drivers/vhost/vhost.c:1652 [inline]
RIP: 0010:log_write+0x3db/0x4a0 drivers/vhost/vhost.c:1676
RSP: 0018:ffff8801a97ef7c8 EFLAGS: 00010202
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffffff8552a06b
RDX: 0000000000000090 RSI: ffffc900046cc000 RDI: ffff8801cd749a58
RBP: ffff8801a97ef908 R08: ffffffff8858b2c0 R09: 1ffff100352fdf0d
R10: 0000000000000001 R11: 0000000000000002 R12: 0001ffffffffffff
R13: ffffed00352fdf0c R14: ffff8801a97ef8e0 R15: ffff8801a97ef860
FS:  00007f78df512700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd3816fc88 CR3: 00000001bb483000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vhost_update_used_flags+0x379/0x480 drivers/vhost/vhost.c:1723
 vhost_vq_init_access+0xca/0x540 drivers/vhost/vhost.c:1763
 vhost_net_set_backend drivers/vhost/net.c:1165 [inline]
 vhost_net_ioctl+0xe74/0x18a0 drivers/vhost/net.c:1321
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 ksys_ioctl+0x94/0xb0 fs/ioctl.c:701
 SYSC_ioctl fs/ioctl.c:708 [inline]
 SyS_ioctl+0x24/0x30 fs/ioctl.c:706
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4552d9
RSP: 002b:00007f78df511c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f78df5126d4 RCX: 00000000004552d9
RDX: 0000000020d7c000 RSI: 000000004008af30 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000341 R14: 00000000006f7eb8 R15: 0000000000000000
Code: 5e 41 5f 5d c3 31 c0 eb a6 e8 c2 03 1f fc 4c 89 e7 e8 8a 27 3f fc 4c 89 f8 48 c1 e8 03 c6 04 18 f8 e9 3a ff ff ff e8 a5 03 1f fc <0f> 0b e8 9e 03 1f fc 4d 8d 65 ff e9 7b fe ff ff e8 90 03 1f fc 
RIP: set_bit_to_user drivers/vhost/vhost.c:1652 [inline] RSP: ffff8801a97ef7c8
RIP: log_write+0x3db/0x4a0 drivers/vhost/vhost.c:1676 RSP: ffff8801a97ef7c8
---[ end trace fede427e7b242a5b ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..