Description of problem:
Try dump guest memory with various formats by qmp command, there are three formats can't loading in crash which is lzo snappy and zlib.
This could be a bug of crash, but I'm not very sure about it.

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

Host:
3.10.0-462.el7.ppc64le
qemu-kvm-rhev-2.6.0-11.el7.ppc64le
crash-7.1.5-1.el7.ppc64le

Guest:
3.10.0-462.el7.ppc64le

How reproducible:
100%

Steps to Reproduce:
1.Boot guest and dump guest memory:

{"execute": "dump-guest-memory", "arguments": { "paging": false, "protocol": "file:/home/dump.zlib", "format": "kdump-zlib"}}
{"timestamp": {"seconds": 1467956988, "microseconds": 623110}, "event": "STOP"}
{"timestamp": {"seconds": 1467957018, "microseconds": 754681}, "event": "DUMP_COMPLETED", "data": {"result": {"total": 2164260864, "status": "completed", "completed": 2164260864}}}
{"timestamp": {"seconds": 1467957018, "microseconds": 755788}, "event": "RESUME"}
{"return": {}}

{"execute": "dump-guest-memory", "arguments": { "paging": false, "protocol": "file:/home/dump.lzo", "format": "kdump-lzo"}}
{"timestamp": {"seconds": 1467957147, "microseconds": 884762}, "event": "STOP"}
{"timestamp": {"seconds": 1467957153, "microseconds": 122147}, "event": "DUMP_COMPLETED", "data": {"result": {"total": 2164260864, "status": "completed", "completed": 2164260864}}}
{"timestamp": {"seconds": 1467957153, "microseconds": 122578}, "event": "RESUME"}
{"return": {}}

{"execute": "dump-guest-memory", "arguments": { "paging": false, "protocol": "file:/home/dump.snappy", "format": "kdump-snappy"}}
{"timestamp": {"seconds": 1467957311, "microseconds": 795600}, "event": "STOP"}
{"timestamp": {"seconds": 1467957315, "microseconds": 278356}, "event": "DUMP_COMPLETED", "data": {"result": {"total": 2164260864, "status": "completed", "completed": 2164260864}}}
{"timestamp": {"seconds": 1467957315, "microseconds": 278762}, "event": "RESUME"}
{"return": {}}


2. Analyze dump file by crash.
# crash /usr/lib/debug/lib/modules/`uname -r`/vmlinux dump.zlib 

crash 7.1.5-1.el7
Copyright (C) 2002-2016  Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
Copyright (C) 1999-2006  Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011  NEC Corporation
Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions.  Enter "help copying" to see the conditions.
This program has absolutely no warranty.  Enter "help warranty" for details.
 
GNU gdb (GDB) 7.6                              
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "powerpc64le-unknown-linux-gnu"...

please wait... (gathering module symbol data)   
WARNING: cannot access vmalloc'd module memory


crash: cannot determine idle task addresses from init_tasks[] or runqueues[]

crash: cannot resolve "init_task_union"


lzo and snappy got the same problem, only elf format can be load.

3.

Actual results:
Can not load dump file.

Expected results:
Can be load.

Additional info:
x86 can't hit this problem.