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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: 0 PID: 12543 Comm: syz-executor0 Not tainted 4.16.0+ #378
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:ffff880190d57918 EFLAGS: 00010212
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffffff855011eb
RDX: 00000000000003db RSI: ffffc90001e91000 RDI: ffff88018e943a98
RBP: ffff880190d57a58 R08: 0000000020bf6000 R09: ffffed0031d653ce
R10: ffff880190d57ad8 R11: ffffed0031d653cd R12: 0001ffffffffffff
R13: ffffed00321aaf36 R14: ffff880190d57a30 R15: ffff880190d579b0
FS:  00007fa6de7d7700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020bf6000 CR3: 00000001b0639000 CR4: 00000000001406f0
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_vsock_start drivers/vhost/vsock.c:446 [inline]
 vhost_vsock_dev_ioctl+0x6b2/0x890 drivers/vhost/vsock.c:678
 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:00007fa6de7d6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa6de7d76d4 RCX: 00000000004552d9
RDX: 00000000200001c0 RSI: 000000004004af61 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000351 R14: 00000000006f8038 R15: 0000000000000000
Code: 5e 41 5f 5d c3 31 c0 eb a6 e8 e2 63 21 fc 4c 89 e7 e8 ba 90 40 fc 4c 89 f8 48 c1 e8 03 c6 04 18 f8 e9 3a ff ff ff e8 c5 63 21 fc <0f> 0b e8 be 63 21 fc 4d 8d 65 ff e9 7b fe ff ff e8 b0 63 21 fc 
RIP: set_bit_to_user drivers/vhost/vhost.c:1652 [inline] RSP: ffff880190d57918
RIP: log_write+0x3db/0x4a0 drivers/vhost/vhost.c:1676 RSP: ffff880190d57918
---[ end trace 619723b24bf893dc ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..