Re: [Crash-utility] dmesg content from crash without debug symbols
----- Original Message -----
Hello,
Is it possible to extract the content of the kernel buffer (result of
the 'log' command) from a kernel dump without access to the kernel debug
symbols ?
The intent is to be able to retrieve a minimal set of information from
the dump on a system that doesn't have to possibility to install the
namelist with debug symbols.
TIA,
Kind regards,
...Louis
--
Louis Bouchard
Backline Support Analyst
Canonical Ltd
Ubuntu support: http://landscape.canonical.com
Do you guys (Ubuntu) have makedumpfile as part of your kdump facility?
It does just that, using the debug/offset information contained in
the vmcoreinfo data:
$ man makedumpfile
...
--dump-dmesg
This option overrides the normal behavior of makedumpfile.
Instead of compressing and filtering a VMCORE to make it
smaller, it simply extracts the dmesg log from a VMCORE and
writes it to the specified LOGFILE. If a VMCORE does not contain
VMCOREINFO for dmesg, it is necessary to specfiy [-x VMLINUX] or
[-i VMCOREINFO].
Example:
# makedumpfile --dump-dmesg /proc/vmcore dmesgfile
# makedumpfile --dump-dmesg -x vmlinux /proc/vmcore dmesgfile
...
Dave