Re: Ftrace, KASLR and gdb

[alexandre.ferrieux@orange.com]

On 13/05/2024 18:25, Steven Rostedt wrote:
> 
> Ah, so you are running gdb on the live kernel.

Yep - sorry I didn't make it clear in the first place :)

>> So, is there currently another method to reach the same effect ?
> 
> Besides kgdb (usually another machine connected to the live kernel),
> this is probably the only way to do what you want.
Ok, thank you for the info.

One reason I'm not using kgdb, beside the obvious pain it is to set up a second 
machine with the appropriate link... is the spirit of ftrace itself: no need for 
breakpoints when you have a nearly-zero-overhead, flexible logger.

And learning from the "live beast" is a 1000x speedup wrt reading the source. 
Learning the Linux Kernel, as open as its source may be, largely remains a 
reverse-engineering operation. With Ftrace, Pahole, and Gdb, one can dig 
*anywhere*. My reasserted kudos for making this possible !

-Alex



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