Description of problem:
kernel: multipathd[7473]: segfault at 7f3c29fc587c ip 00007f3c2caeea9f sp 00007f3c2e479660 error 4 in libgcc_s-8-20190507.so.1[7f3c2cadf000+17000]

Version-Release number of selected component (if applicable):
RHEL-8.1.0-20190523.0

How reproducible:
once

Steps to Reproduce:
1.setup multipath
2.Loading scsi_debug module for simulation of mpath
3.Waiting for udev to create /dev/sdX
4./etc/multipath.conf updated
defaults {
#Enable multibus is for mutlbus testing
    path_grouping_policy multibus
    user_friendly_names     yes
}
blacklist {
        device {
                vendor .*
                product .*
        }
}
blacklist_exceptions {
        device {
                vendor Linux
                product scsi_debug
        }
}
5.Restarting multiapth and reload configuration
6.    for X in `seq 1 ${ROUNDS}`;do
        service multipathd stop
        multipath -F
        service multipathd start

      done

Found segfault of multipathd when multipathd shutdown test round 11


Actual results:
FAIL: Found segfault of multipathd
May 24 06:47:57 intel-chiefriver-01 kernel: multipathd[7473]: segfault at 7f3c29fc587c ip 00007f3c2caeea9f sp 00007f3c2e479660 error 4 in libgcc_s-8-20190507.so.1[7f3c2cadf000+17000]

Expected results:
No segfault 

Additional info:
beaker job:https://beaker.engineering.redhat.com/recipes/6909956#task93420453
test log:http://beaker-archive.host.prod.eng.bos.redhat.com/beaker-logs/2019/05/35596/3559642/6909956/93420461/taskout.log
console log:http://beaker-archive.host.prod.eng.bos.redhat.com/beaker-logs/2019/05/35596/3559642/6909956/console.log