kernel-packages team mailing list archive

[Chris J Arges <1415562@xxxxxxxxxxxxxxxxxx>]

On 02/04/2015 01:29 PM, bugproxy wrote:
> ------- Comment From hbathini@xxxxxxxxxx 2015-02-04 19:20 EDT-------
> Louis & Chris, thanks for your help.
> The packages work as intended in both kdump & fadump modes.
> Couple of observations though:
> 
> 1. When doing load/unload twice in succession, echo throws an error
> 
> root@lop831:~# kdump-config load
> * fadump registered successfully
> root@lop831:~# kdump-config load
> /usr/sbin/kdump-config: line 301: echo: write error: Invalid argument
> * fadump registered successfully
> root@lop831:~#
> --
> 
> root@lop831:~# kdump-config unload
> * fadump un-registered successfully
> root@lop831:~# kdump-config unload
> /usr/sbin/kdump-config: line 323: echo: write error: Invalid argument
> * fadump un-registered successfully
> root@lop831:~#
> 

The code is where we set values into the sysfs directory:
echo 1 > $sys_fadump_registered

Where:
sys_fadump_registered=/sys/kernel/fadump_registered


Hari, can you confirm if kdump-config load/unload are actually changing
these values correctly? Perhaps the code needs to be adjusted.

> 2. While using network dump (SSH), would be nice if we can warn the user to run
> 'kdump-config propagate' before 'kdump-config load', if /root/.ssh/kdump_id_rsa is missing.
> This applies to both kdump & fadump modes
> 
> Thanks
> Hari
> 

Louis,
This might be a good general bug/issue to look into.

Thanks,
--chris

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https://bugs.launchpad.net/bugs/1415562

Title:
  [Ubuntu 15.04] Support firmware assisted dump on ppc64le

Status in linux package in Ubuntu:
  Fix Committed
Status in makedumpfile package in Ubuntu:
  In Progress

Bug description:
  Starting from POWER6, the firmware now has a capability to preserve
  the partition memory dump during system crash and boot into a fresh
  copy of the kernel with fully-reset system. This feature adds the
  necessary support to exploit the dump capture capability provided by
  Power firmware.  With this feature support, the production kernel will
  register for firmware-assisted dump using RTAS (Runtime Abstraction
  Service) calls and builds required ELF header which then gets exported
  through '/proc/vmcore' in the second kernel after crash.  This feature
  improves Power serviceability by making it more robust compared to
  current kdump mechanism on Linux.

  Ubuntu 15.04 kernel already includes the necessary code for fadump.
  The only kernel change needed is to enable CONFIG_FA_DUMP in the
  kernel configuration. In addition, an update is needed for a script in
  kdump-tools package.

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