----- 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@0x00000000e0000000,DDRCS1_0.BIN(a)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. > There is NO WARRANTY, to the extent permitted by law. Type "show copying" > 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@0x00000000e0000000,DDRCS1_0.BIN(a)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@0x0000000080000000,DDRCS0_0.BIN(a)0x00000000e0000000 Dave