QA:Testcase multipath kpartx crash

Description

This testcase checks whether kpartx will crash when called with invalid options. It is reported in fixed bug that when kpartx was passes something other than a file or a block device or a badly formed pathname, it could read off the end of the device string, and crash. The test steps include:1)install device-mapper device-mapper-multipath 2)restart multipathd service 3)kpartx -l / 4)check dmesg if there is segmentation fault

How to test

1. Ensure the device-mapper-multipath package is installed

   Execute: dnf -y install device-mapper device-mapper-multipath
   Execute: rpm -qa 

2. Execute the following command to generate the configuration file:

   Execute: mpathconf --enable

3. Restart multipathd service

   Execute: service multipathd restart

4. kpartx called with invalid options /

   Execute:kpartx -l /

5. sleep 1 second

   Execute:sleep 1

6. check dmesg if there is segmentation fault

   Execute:dmesg

Expected Results

1. no Segmentation fault, kpartx no longer crashes when called with invalid options.