Debugging system freezes
Sometimes your Debian box hangs, and for a strange reason, there is no debugging information printed on your screen. What options do you have?
System logs
The first place to look for debug information is /var/log. kern.log, daemon.log, messages and dmesg often contain precious information about what went wrong. This will help you identify which hardware or even software component is causing trouble to the kernel.
Console output
Kernel oopses are usually printed in /var/log/dmesg but if the problem stalls hard drive I/O, you won't find much in the log files. And if you are running X, you won't be able to see what is printed to the console. But there are ways to get output.
The first one is to use CONFIG_MAGIC_SYSRQ which enables the magic ALT+PRINTSCREEN kernel command line interface.
Serial console
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