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Description of problem:


Version-Release number of selected component (if applicable):
device-mapper-multipath-0.4.9-51.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
# multipath -ll
mpathb (353333330000007d1) dm-2 Linux   ,scsi_debug      
size=1.0G features='0' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=1 status=active
| `- 32:0:0:1 sdc 8:32 active ready running
`-+- policy='service-time 0' prio=1 status=enabled

1. > /etc/multipath/wwids
2. multipath -W
successfully reset wwids
3. multipath -w mpathb
wwid '353333330000007d1' not in wwids file
4. cat /etc/multipath/wwids 
# Multipath wwids, Version : 1.0
# NOTE: This file is automatically maintained by multipath and multipathd.
# You should not need to edit this file in normal circumstances.
#
# Valid WWIDs:
/353333330000007d1/

workaround:
run multipath -W again, then multipath -w mpathb will work.

Actual results:
multipath -w fails to remove the wwid

Expected results:


Additional info:

Multipath wasn't seeking back to the start of the file after it truncated it.  I'll have a package with a fix shortly.

This has been fixed now

It's verified by /kernel/storage/multipath/wwids in RHEL7.0 snap2/snap3 testing:
https://tcms.engineering.redhat.com/run/108940/?from_plan=7249