How to support crash tool for linux-5.15 or later versions

[KangHoupeng]

Now I want to support crash dump tool for linux-5.15， however， it can't read analyze the vmlinux and vmcore.
And I found the crash-utility's commit 9f168fb fix it for Linux 5.1 kernels.
So I wonder if the linux-5.15 is different for low version kernel and we need deal with it in the same way.

kernel info:
/ # uname -a
Linux sun_xx_iw_x_p1 5.15.41+ #12 SMP PREEMPT Mon Sep 19 16:42:54 CST 2022 aarch64 GNU/Linux

Message as follow:
crashs 8.0.1++
Copyright (C) 2002-2022 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, 2020-2022 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
Copyright (C) 2015, 2021 VMware, 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.

NOTE: setting vabits_actual to: 39

NOTE: setting kimage_voffset to: 0xffffffbfc8000000

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sp: 0xffffffc0087cf580
WARNING: could not find MAGIC_START!
crashs: dbg/vmlinux and /var/tmp/ramdump_elf_Lmb5Zc do not match!

Usage:

crash [OPTION]... NAMELIST MEMORY-IMAGE[@address] (dumpfile form)
crash [OPTION]... [NAMELIST] (live system form)

Enter "crashs -h" for details.

[KangHoupeng]

Yeah, I have solved it.
When I assign the kalsr as 0x80000，It can work well.
./crashs tmp/vmlinux tmp/de_dram_data_202292093322@0x40000000 --machdep vabits_actual=39 --machdep kimage_voffset=0xffffffbfc8000000 --kaslr 0x80000

5.4:
[ 221.697165] SMP: stopping secondary CPUs
[ 221.701677] Kernel Offset: disabled
[ 221.705609] CPU features: 0x00010002,20002004
[ 221.710492] Memory Limit: none

5.15:
[ 91.749294] SMP: stopping secondary CPUs
[ 91.753755] Kernel Offset: 0x80000 from 0xffffffc008000000
[ 91.759894] PHYS_OFFSET: 0x40000000
[ 91.763797] CPU features: 0x0,00004801,00000842
[ 91.768869] Memory Limit: none

crashs 8.0.1++
Copyright (C) 2002-2022 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, 2020-2022 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
Copyright (C) 2015, 2021 VMware, 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.

NOTE: setting vabits_actual to: 39

NOTE: setting kimage_voffset to: 0xffffffbfc8000000

GNU gdb (GDB) 10.2
Copyright (C) 2021 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-pc-linux-gnu --target=aarch64-elf-linux".
Type "show configuration" for configuration details.
Find the GDB manual and other documentation resources online at:
http://www.gnu.org/software/gdb/documentation/.

For help, type "help".
Type "apropos word" to search for commands related to "word"...

sp: 0xffffffc00884f580
sp: 0xffffffc00884f580
WARNING: cpu 0: cannot find NT_PRSTATUS note
WARNING: cpu 1: cannot find NT_PRSTATUS note
WARNING: cpu 2: cannot find NT_PRSTATUS note
WARNING: cpu 3: cannot find NT_PRSTATUS note
KERNEL: tmp/vmlinux
DUMPFILES: /var/tmp/ramdump_elf_QYaCg1 [temporary ELF header]
tmp/de_dram_data_202292093322
CPUS: 4 [OFFLINE: 3]
DATE: Wed Feb 15 04:02:37 CST 2012
UPTIME: 00:01:31
LOAD AVERAGE: 0.78, 0.26, 0.10
TASKS: 85
NODENAME: sun_xx_iw_x_p1
RELEASE: 5.15.41
VERSION: #13 SMP PREEMPT Tue Sep 20 09:15:52 CST 2022
MACHINE: aarch64 (unknown Mhz)
MEMORY: 3 GB
PANIC: "Kernel panic - not syncing: sysrq triggered crash"
PID: 407
COMMAND: "ash"
TASK: ffffff8002caf080 [THREAD_INFO: ffffff8002caf080]
CPU: 0
STATE: TASK_RUNNING (PANIC)

sp: 0xffffffc00884f580
crashs> help

•          files          mod            sbitmapq       union
  

alias foreach mount search vm
ascii fuser net set vtop
bpf gdb p sig waitq
bt help ps struct whatis
btop ipcs pte swap wr
dev irq ptob sym q
dis kmem ptov sys
eval list rd task
exit log repeat timer
extend mach runq tree

crashs version: 8.0.1++ gdb version: 10.2
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crashs>