[Crash-utility] Fail to parse dump of linux4.4 on arm64

[Dave Anderson]

----- Original Message -----
> 
> when I use the crash tool to analysis the ram dump of linux4.4 on arm64,it
> failed，is someone can help me？the error information as follow。
> ----------------------------------------------------------------------------
> Port_COM151$ crash64 vmlinux
> DDRCS0_0.BIN at 0x00000000e0000000,DDRCS1_0.BIN at 0x0000000080000000
> crash64 7.1.9
> 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.
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> 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
> >
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> This GDB was configured as "--host=x86_64-unknown-linux-gnu
> --target=aarch64-elf-linux"...
> 
> crash64: read error: kernel virtual address: ffffff8ed5cccef0 type: "possible"
> WARNING: cannot read cpu_possible_map
> crash64: read error: kernel virtual address: ffffff8ed5cccee8 type: "present"
> WARNING: cannot read cpu_present_map
> crash64: read error: kernel virtual address: ffffff8ed5ccced8 type: "online"
> WARNING: cannot read cpu_online_map
> crash64: read error: kernel virtual address: ffffff8ed5cccef8 type: "active"
> WARNING: cannot read cpu_active_map
> crash64: read error: kernel virtual address: ffffff8ed5cccee8 type: "cpu_present_map"
> crash64: read error: kernel virtual address: ffffff8ed5ccced8 type: "cpu_online_map"
> crash64: read error: kernel virtual address: ffffff8ed5ccced8 type: "cpu_online_map"
> crash64: read error: kernel virtual address: ffffff8ed5ccced8 type: "cpu_online_map"
> Segmentation fault (core dumped)

As I mentioned in my first response, my best guess is that the phys_offset 
value being used by the crash utility is incorrect.  A couple suggestions:

(1) What is the output of: 

    crash -d8 vmlinux DDRCS0_0.BIN at 0x00000000e0000000,DDRCS1_0.BIN at 0x0000000080000000

(2) Does it make a difference if the order of the two files are switched, so that the
    lower phyiscal memory block is entered first?  i.e:

    crash vmlinux DDRCS1_0.BIN at 0x0000000080000000,DDRCS0_0.BIN at 0x00000000e0000000

Dave