January 2018
Intermediate to advanced
456 pages
12h 49m
English
A kernel crashing on boot usually provides no output whatsoever on the console. As daunting as that may seem, there are techniques we can use to extract debug information. Early crashes usually happen before the serial console has been initialized, so even if there were log messages, we would not see them. The first thing we will show is how to enable early log messages that do not need the serial driver.
In case that is not enough, we will also show techniques to access the log buffer in memory.
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