Trying kdump on CentOS 6.3.
On VMWare everything is fine and on oops crash kernel is loaded and vmcore created.
On phisical machine I see oops message, but crash kernel is not started.
I used kexec to load kernel, kdump loads. I used "kexec --load" instead of "kexec --load-panic" as kdump does. After that I run "kexec -e" to load into new kernel. On console I see message "Starting new kernel" forever.