[RHEL5.8]kpartx does not create device maps from partition tables for some mpath devices

Issue

kpartx does not create device maps from partition tables for some mpath devices.

But further analysis of the underlying device shows the following information from the device.

      Device Boot      Start         End      Blocks   Id  System
/dev/loop0p1               1       39162   314568733+   5  Extended

Note :Device has a Extended partition on it. Not a Primary partition.

Some more information about the issue :

mpath1 (36001438005df06a600009000047e0000) dm-16 HP,HSV450
[size=300G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=200][active]
 \_ 2:0:6:9  sdck       69:128 [active][ready]
 \_ 2:0:7:9  sdcw       70:64  [active][ready]
 \_ 1:0:4:9  sdm        8:192  [active][ready]
 \_ 1:0:5:9  sdy        65:128 [active][ready]
\_ round-robin 0 [prio=40][enabled]
 \_ 1:0:6:9  sdak       66:64  [active][ready]
 \_ 1:0:7:9  sdaw       67:0   [active][ready]
 \_ 2:0:4:9  sdbm       68:0   [active][ready]
 \_ 2:0:5:9  sdby       68:192 [active][ready]

parted -s /dev/sdm print
Error: Invalid partition table on /dev/sdm -- wrong signature 0.

parted -s /dev/sdy print 
Error: Invalid partition table on /dev/sdy -- wrong signature 0.

parted -s /dev/sdck print 
Error: Invalid partition table on /dev/sdck -- wrong signature 0.

parted -s /dev/sdcw print 
Error: Invalid partition table on /dev/sdcw -- wrong signature 0.

But dd captured from the underlying device showed the following information.

     Device    Boot      Start         End      Blocks   Id  System
/dev/loop0p1               1       39162   314568733+   5  Extended