IPVS: ftp: loaded support on port[0] = 21
------------[ cut here ]------------
kernel BUG at drivers/vhost/vhost.c:1652!
invalid opcode: 0000 [#1] SMP PTI
Dumping ftrace buffer:
------------[ cut here ]------------
   (ftrace buffer empty)
kernel BUG at drivers/vhost/vhost.c:1652!
Modules linked in:
CPU: 0 PID: 4494 Comm: syz-executor641 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:set_bit_to_user drivers/vhost/vhost.c:1650 [inline]
RIP: 0010:log_write+0x5fa/0x660 drivers/vhost/vhost.c:1676
RSP: 0018:ffff8801c237fa90 EFLAGS: 00010297
RAX: 0000000000000000 RBX: ffff8801d8738918 RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: 000fdfdffff00001 RDI: 000000009ba0009d
RBP: ffff8801c237fb30 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8aea98f700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020bf6000 CR3: 00000001a22d8000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vhost_update_used_flags+0x680/0x8d0 drivers/vhost/vhost.c:1723
 vhost_vq_init_access+0x173/0xa20 drivers/vhost/vhost.c:1763
 vhost_vsock_start drivers/vhost/vsock.c:446 [inline]
 vhost_vsock_dev_ioctl+0x1051/0x1450 drivers/vhost/vsock.c:678
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xaf0/0x2440 fs/ioctl.c:686
 SYSC_ioctl+0x1d2/0x260 fs/ioctl.c:701
 SyS_ioctl+0x54/0x80 fs/ioctl.c:692
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x44a039
RSP: 002b:00007f8aea98ece8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 000000000044a039
RDX: 0000000020f82ffc RSI: 000000004004af61 RDI: 000000000000001a
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd37afe2bf R14: 00007f8aea98f9c0 R15: 0000000000000009
Code: eb 1b 8b 7d c0 e8 f7 00 35 fa 45 85 f6 0f 89 fe fb ff ff eb 0f 4d 89 f7 e9 ed fd ff ff e8 5f 7f dd f9 eb 25 e8 58 7f dd f9 eb 3e <0f> 0b 0f 1f 40 00 eb fe 8b 7d d0 e8 c6 00 35 fa 4d 85 ff 0f 85 
RIP: set_bit_to_user drivers/vhost/vhost.c:1650 [inline] RSP: ffff8801c237fa90
RIP: log_write+0x5fa/0x660 drivers/vhost/vhost.c:1676 RSP: ffff8801c237fa90
invalid opcode: 0000 [#2] SMP PTI
---[ end trace 09540ff68128c8ce ]---
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4496 Comm: syz-executor641 Tainted: G      D          4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011