Following unexplained machine freezing, I am attempting to generate a kernel core dump (vmcore) using the kdump facility.
My system is an AMD x86_64.
1) I installed the kexec-tools package
2) I added the crashkernel=128M@16M kernel parameter in the /etc/grub.conf
3) considering my boot partition is labeled /boot, I set the following /etc/kdump.conf:
I rebooted the kernel, checked that 128MB less memory has "gone" (free -m), and issued echo c > /proc/sysrq-triiger to force a kernel panic.
What I see is the kernel trying rebooting: I can just see the first line of a normal boot sequence (related to intird), but it will not continue booting. Instead it resets the computer and a normal boot sequence is initiated (that is through the BIOS). As the display scrolls quickly it is hard to see any error message that could occur.
Of course I don't get any vmcore in the /boot directory after that.
What is also strange is that I have a initrd-22.214.171.124-49.fc8kdump.img file in that directory that does not belong to any package: what's it's use, where is it coming from is a mistery to me.
Please any help will be appreciated.
Bibliography: Fedora: http://fedoraproject.org/wiki/StackTraces
Red Hat: http://people.redhat.com/anderson/.crash_whitepaper/