Hardware debugging presentation

Find the fault

•Type ‘f’ into the crash debugger to get the Fault information

…If the category is KERN 4 then you are in business.

…KERN 4 simply says that a panic happened in a system thread

…The actual panic, such as KERN-EXEC3, is hidden

•Type ‘i’ into the crash debugger to get information about the real panic reason

…Sometimes even this doesn’t work - a non-system critical thread which crashes can cause the process to exit if it is process critical e.g. the main thread

…If another thread in the process is marked as system critical this will take down the platform.

•A fool proof method of finding the real panic is to look at the output from the KPanic debug tracing

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