[Crash-utility] crash doesnt give complete backtrace

Hi All, I get a kernel panic on my system and I see a long backtrace on the console before the system freezes. I have kdump setup and analyse the generated vmcore using crash. But the backtrace from crash is too short and it doesnt give any relevant information. I wanted backtrace that appeared on the console before freezing. Any ideas on this? Regards, Adhiraj.