Pratyush,
Just for debug purpose.
Please add the following line to *your* arch_crash_save_vmcoreinfo():
> vmcoreinfo_append_str("NUMBER(kimage_voffset)=%llx\n", kimage_voffset);
I will add this to my next kdump patch.
Thanks,
-Takahiro AKASHI
On Thu, May 26, 2016 at 10:58:24AM +0530, Pratyush Anand wrote:
> On 24/05/2016:01:59:06 PM, Dave Anderson wrote:
> >
> >
> > ----- Original Message -----
> > > Yet some issues, but ...
> > >
> >
> > Hi Takahiro,
> >
> > Here are my general comments on my testing of the v2 patch, followed
> > by a few comments in the patch itself.
> >
> > First, the combination of the new memory map layout and KASLR is somewhat
> > confusing. I am testing your patch on a 4.6.0-0.rc7.git2.1.fc25 kernel
> > that has this configuration:
> >
> > config-arm64:# CONFIG_RANDOMIZE_BASE is not set
> >
> > So KASLR doesn't really enter into the picture. But when bringing
> > up the crash session, it shows the "kaslr kernel" WARNING:
> >
> > # ./crash
> >
> > crash 7.1.5++
> > 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.
> >
> > WARNING: kimage_voffset not identified for kaslr kernel
> > 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 "aarch64-unknown-linux-gnu"...
> >
> > KERNEL: /usr/lib/debug/lib/modules/4.6.0-0.rc7.git2.1.fc25.aarch64/vmlinux
> > DUMPFILE: /dev/crash
> > CPUS: 8
> > DATE: Tue May 24 10:08:08 2016
> > UPTIME: 11 days, 18:32:41
> > LOAD AVERAGE: 0.17, 0.09, 0.12
> > TASKS: 197
> > NODENAME: apm-mustang-ev3-36.khw.lab.eng.bos.redhat.com
> > RELEASE: 4.6.0-0.rc7.git2.1.fc25.aarch64
> > VERSION: #1 SMP Thu May 12 13:28:43 UTC 2016
> > MACHINE: aarch64 (unknown Mhz)
> > MEMORY: 16 GB
> > PID: 7556
> > COMMAND: "crash"
> > TASK: fffffe00beb45400 [THREAD_INFO: fffffe00beb98000]
> > CPU: 7
> > STATE: TASK_RUNNING (ACTIVE)
> >
> > crash>
>
> Do not know whats missing, I am yet not able to reach "crash>" prompt. I have
> crash utility having this patch on top of "commit
> 8ceb1ac628bf6a0a7f0bbfff030ec93081bca4cd" [1]. I have kernel code v4.6+kexec-v15 [2].
>
> In my .config:
> # CONFIG_KASAN is not set
> # CONFIG_RANDOMIZE_BASE is not set
>
> This is what I get:
>
> [root@dhcppc15 crash]# ./crash /lib/modules/4.6.0+/build/vmlinux /var/crash/127.0.0.1-2016-05-26-09\:40\:05/vmcore
>
> crash 7.1.5++
> 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 "aarch64-unknown-linux-gnu"...
>
> crash: read error: kernel virtual address: fffffc0008b80fd8 type: "possible"
> WARNING: cannot read cpu_possible_map
> crash: read error: kernel virtual address: fffffc0008b80dd8 type: "present"
> WARNING: cannot read cpu_present_map
> crash: read error: kernel virtual address: fffffc0008b80bd8 type: "online"
> WARNING: cannot read cpu_online_map
> crash: read error: kernel virtual address: fffffc0008b811d8 type: "active"
> WARNING: cannot read cpu_active_map
> crash: read error: kernel virtual address: fffffc00091f6c78 type: "shadow_timekeeper xtime_sec"
> crash: read error: kernel virtual address: fffffc0008b9223c type: "init_uts_ns"
> crash: /lib/modules/4.6.0+/build/vmlinux and /var/crash/127.0.0.1-2016-05-26-09:40:05/vmcore do not match!
>
> Usage:
>
> crash [OPTION]... NAMELIST MEMORY-IMAGE[@ADDRESS] (dumpfile form)
> crash [OPTION]... [NAMELIST] (live system form)
>
> Enter "crash -h" for details.
>
>
> ~Pratyush
>
> [1] https://github.com/pratyushanand/crash/commits/master
> [2] https://github.com/pratyushanand/linux/commits/upstream_arm64_devel_test
>
--
Thanks,
-Takahiro AKASHI
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