When the system hangs, the
"Caps lock" and "Scroll lock" lights on the keyboard
turn on. After reboot, I can not find any trace from
the syslog. Can anyone give me some hints about how to
debug this kind of situation and which part of the
code I should pay more attention to ? Thanks.

Hook up a serial console, likely you'll see a kernel oops trace appear on that console. Analyse it with ksymoops on 2.4 kernels; 2.6 is easier to develop with since "kksymoops" is built in.





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