mpathpersist segfaults in RHEL 7

Issue

• The fencing agent fence_mpath fails:

Jan 28 21:02:52 node42 kernel: [1052740.475509] mpathpersist[23509]: segfault at b01bd20b8 ip 00007fea73f3c4dc sp 00007ffe506a0a48 error 4 in libc-2.17.so[7fea73ebc000+1b8000]
Jan 28 21:02:52 node42 kernel: sd 7:0:0:8: reservation conflict
Jan 28 21:02:52 node42 kernel: sd 8:0:0:8: reservation conflict
[....]
Jan 28 21:02:52 node42 stonith-ng[2369]: warning: fence_mpath[23372] stderr: [ ERROR:root:Failed to verify 10 device(s) ]
Jan 28 21:02:52 node42 stonith-ng[2369]: warning: fence_mpath[23372] stderr: [ 2019-01-28 21:02:52,836 ERROR: Failed to verify 10 device(s) ]

• mpathpersist segfaults with messages in the logs like:

 Oct  1 18:45:27 node42 kernel: mpathpersist[8013]: segfault at b3f1c0fc8 ip 00007f69e6b4fbcc sp 00007ffcab525088 error 4 in libc-2.17.so[7f69e6aca000+1c3000]
Oct  1 18:45:29 node42 kernel: mpathpersist[12070]: segfault at b63632460 ip 00007f5cbfa83ec3 sp 00007ffce3b61eb0 error 4 in libudev.so.1.6.2[7f5cbfa7f000+15000]