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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: 19693 Comm: syz-executor2 Not tainted 4.16.0+ #2
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+0x42a/0x4d0 drivers/vhost/vhost.c:1676
RSP: 0018:ffff8801bd88f920 EFLAGS: 00010212
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90007f18000
RDX: 00000000000003af RSI: ffffffff8591c3fa RDI: 0000000000000005
RBP: ffff8801bd88fa58 R08: ffff88018a49c2c0 R09: ffffed00302a865d
R10: ffff8801bd88fad8 R11: ffff8801815432ef R12: 0001ffffffffffff
R13: ffffed0037b11f36 R14: 0000000000000000 R15: ffff8801bd88fa30
FS:  00007f1aa2135700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000207cb000 CR3: 00000001af7f3000 CR4: 00000000001426e0
DR0: 00000000f926040e DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vhost_update_used_flags+0x3af/0x4a0 drivers/vhost/vhost.c:1723
 vhost_vq_init_access+0x117/0x590 drivers/vhost/vhost.c:1763
 vhost_vsock_start drivers/vhost/vsock.c:446 [inline]
 vhost_vsock_dev_ioctl+0x751/0x920 drivers/vhost/vsock.c:678
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x1650 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 SYSC_ioctl fs/ioctl.c:708 [inline]
 SyS_ioctl+0x24/0x30 fs/ioctl.c:706
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4552d9
RSP: 002b:00007f1aa2134c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1aa21356d4 RCX: 00000000004552d9
RDX: 0000000020f82ffc RSI: 000000004004af61 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000351 R14: 00000000006f8038 R15: 0000000000000000
Code: e8 4c d5 e4 fb 4c 89 ef e8 64 8d 06 fc 48 8d 85 58 ff ff ff 48 c1 e8 03 c6 04 18 f8 e9 46 ff ff ff 45 31 f6 eb 91 e8 26 d5 e4 fb <0f> 0b e8 1f d5 e4 fb 48 c7 c6 a0 9f 24 88 4c 89 ef e8 a0 2e 11 
RIP: set_bit_to_user drivers/vhost/vhost.c:1652 [inline] RSP: ffff8801bd88f920
RIP: log_write+0x42a/0x4d0 drivers/vhost/vhost.c:1676 RSP: ffff8801bd88f920
---[ end trace 6357b79c68ed0aed ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..