On Fri, Mar 14, 2014 at 12:41:41PM -0700, Linus Torvalds wrote:
> On Fri, Mar 14, 2014 at 12:32 PM, Linus Torvalds
> <[email protected]> wrote:
> >
> > Hmm. Do you have CONFIG_KALLSYMS enabled?
>
> Just to clarify. KALLSYMS is required to figure out the symbol
> addresses on a kaslr system. There's no way to look them up in a
> System.map file or the object file, since the addresses aren't going
> to match.
>
> Your symptoms really sound like you might not have KALLSYMS enabled.
>
> I wonder if we have a "select KALLSYMS" as part of RANDOMIZE_BASE,
> since you need it for debug messages too (random hex numbers aren't
> too useful ;)
Ok, I've figured out the cause. kaslr is a red herring.
This works :
# su - root
$ tools/perf/perf top
This doesn't:
# sudo tools/perf/perf top
Neither does:
# su - root
$ sudo tools/perf/perf top
So somehow sudo+perf broke. fun.
The 3.13 binary works regardless of how I call it.
Dave
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