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SubjectRe: Capturing crash with 4.6.0 and above kernel does not work
Date


On 8/25/16, 10:39 PM, "Baoquan He" <bhe@redhat.com> wrote:

>On 08/25/16 at 05:45pm, Himanshu Madhani wrote:
>>
>
>crashkernel has been reserved successfully.
>Aug 25 10:36:44 dut4062 kernel: Reserving 512MB of memory at 368MB for crashkernel (System RAM: 130847MB)
>
>So what's the result of executing "grep Crash /porc/iomem" on your
>system?

root@dut4062:~# grep Crash /proc/iomem
17000000-36ffffff : Crash kernel

Which does indicate that 512MB is set aside for crash dump


>
>>
>> On 8/25/16, 1:10 AM, "Michal Hocko" <mhocko@kernel.org> wrote:
>>
>> >[Let's add kdump people]
>> >
>> >On Wed 24-08-16 16:38:56, Himanshu Madhani wrote:
>> >> Hello list,
>> >>
>> >> I am wondering if anybody has issue capturing crash dump with the 4.6.0 and above kenrel.
>> >>
>> >> I have a system, when booted in 4.5.7 kernel is able to capture crash dump.
>> >> However, when I boot this system in 4.6.4 and 4.7.2 kernel, crash dump is not
>> >> able to capture any crash.
>> >>
>> >> I am still facing same issue with 4.8.0-rc2+ kernel and from the error at the command prompt,
>> >> it seems like kexec is ignoring “crashkenrel” parameter.
>> >>
>> >> I added below information in https://bugzilla.kernel.org/show_bug.cgi?id=119291.
>> >>
>> >> # uname -r
>> >> 4.8.0-rc2+
>> >>
>> >> # cat /proc/cmdline
>> >> ro root=/dev/mapper/vg_dut4110-lv_root rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=512M rd_LVM_LV=vg_dut4110/lv_swap rd_LVM_LV=vg_dut4110/lv_root rd_NO_DM rhgb quiet
>> >>
>> >> # service kdump status
>> >> Kdump is not operational
>> >>
>> >> # service kdump start
>> >> Memory for crashkernel is not reserved
>> >> Please reserve memory by passing "crashkernel=X@Y" parameter to the kernel
>> >> Starting kdump: [FAILED]
>> >
>> >It smells like the crash kernel reservation has failed. Could you
>> >provide the full kernel log?
>>
>> Attached is kernel log from fresh kernel compile of 4.6.5 (linux-stable) tree
>>
>> root@dut4062:~# cat /proc/cmdline
>> ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=512M rd_LVM_LV=VolGroup/lv_root KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb console=ttyS0 console=ttyS0,115200n8
>>
>> root@dut4062:~# service kdump status
>>
>> Kdump is not operational
>>
>> root@dut4062:~# service kdump start
>> Memory for crashkernel is not reserved
>> Please reserve memory by passing "crashkernel=X@Y" parameter to the kernel
>> Starting kdump: [FAILED]
>> root@dut4062:~#
>>
>> Messages in log fil
>>
>> Aug 25 10:42:16 dut4062 kdump: kexec: failed to load kdump kernel
>> Aug 25 10:42:16 dut4062 kdump: failed to start up
>>
>>
>> root@dut4062:~# kexec --ver
>> kexec-tools 2.0.0 released 19th July 2008
>> root@dut4062:~#
>>
>> root@dut4062:~# crash --version
>>
>> 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 "x86_64-unknown-linux-gnu".
>>
>> Let me know if any other details are needed. I have multiple servers which exhibit same issues.
>>
>>
>>
>>
>>
>>
>> >
>> >> message file confirms that kexec was not able to start the service
>> >>
>> >> Aug 15 10:41:17 dut4110 kdump: kexec: failed to load kdump kernel
>> >> Aug 15 10:41:17 dut4110 kdump: failed to start up
>> >>
>> >> Note, that same option is able to load kdump service for 4.5.7 kernel.
>> >>
>> >> I can provide any details needed to help resolve this issue.
>> >>
>> >> Thanks,
>> >> - Himanshu
>> >>
>> >
>> >--
>> >Michal Hocko
>> >SUSE Labs
>
>
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