Cracking failed on Radeon Pro WX5100

[dfns]

Hi,
I'm running VM (Ubuntu LTS 16.04.2 with kernel 4.4.0-77-generic) with GPU-Passthrough of Radeon Pro WX5100 with latest drivers from AMD (amdgpu-pro-17.10-414273). 
If I start a hashcat-examples none of them can be cracked. 

To test this issue, I generated some MD5-hashes to test: 
echo -n "test" | md5sum -> 098f6bcd4621d373cade4e832627b4f6 -> test.md5
But it will not cracked, neither in wordlist mode nor in brute-force mode:
hashcat64 -m 0 -a 0 test.md5 example.dict
hashcat64 -m 0 -a 3 test.md5 ?l?l?l?l

Here my output of device info:
hashcat -I
------------------------
hashcat (v3.5.0) starting...

OpenCL Info:

Platform ID #1
  Vendor  : Advanced Micro Devices, Inc.
  Name    : AMD Accelerated Parallel Processing
  Version : OpenCL 2.0 AMD-APP (2348.3)

  Device ID #1
    Type           : GPU
    Vendor ID      : 1
    Vendor         : Advanced Micro Devices, Inc.
    Name           : Ellesmere
    Version        : OpenCL 1.2 AMD-APP (2348.3)
    Processor(s)   : 28
    Clock          : 1086
    Memory         : 4048/8164 MB allocatable
    OpenCL Version : OpenCL C 1.2 
    Driver Version : 2348.3

  Device ID #2
    Type           : CPU
    Vendor ID      : 128
    Vendor         : GenuineIntel
    Name           : Common KVM processor
    Version        : OpenCL 1.2 AMD-APP (2348.3)
    Processor(s)   : 4
    Clock          : 3192
    Memory         : 3947/3947 MB allocatable
    OpenCL Version : OpenCL C 1.2 
    Driver Version : 2348.3 (sse2)

Did I miss something or is there a bug?