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

[vinayak menon]

On Wed, Jan 10, 2018 at 8:40 PM, Dave Anderson <anderson at redhat.com> wrote:
>
>
> ----- 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.
>> 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.
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>> and "show warranty" for details.
>> 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
>
Just going by the numbering of the dumps, also see if the address of
dumps got reversed. i.e. DDRCS0_0.BIN is @ 0x80000000 and DDRCS1_0.BIN
@0xe0000000
And also check if kaslr is enabled and if yes make sure proper offset
is passed via --kaslr.

Thanks,
Vinayak