llvm dev - Mar 2017 - sancov reporting all locations as <invalid>:0

I'm working on a fuzzer using libFuzzer and I wanted to take a look at
how my coverage was doing, as per the instructions here:

  http://llvm.org/docs/LibFuzzer.html#how-good-is-my-fuzzer

First of all, I suspect the instructions there are out of date, but
passing -dump_coverage=1 to the binary rather than setting ASAN_OPTIONS
generated a .sancov file for me.

However, when I inspect this with the sancov tool, all of the line
numbers it reports are "<invalid>:0". I can list the covered and
uncovered functions successfully, but without locations it's really hard
to do anything with that information.

I've built with -gline-tables-only, as is the default when building llvm
with sanitizers enabled.

Have you seen this before? Am I doing something obviously wrong?

+aizatsky

On Tue, Mar 7, 2017 at 12:34 PM, Justin Bogner <mail at justinbogner.com>
wrote:
> I'm working on a fuzzer using libFuzzer and I wanted to take a look at
> how my coverage was doing, as per the instructions here:
>
>   http://llvm.org/docs/LibFuzzer.html#how-good-is-my-fuzzer
>
> First of all, I suspect the instructions there are out of date, but
> passing -dump_coverage=1 to the binary rather than setting ASAN_OPTIONS
> generated a .sancov file for me.
>
> However, when I inspect this with the sancov tool, all of the line
> numbers it reports are "<invalid>:0". I can list the
covered and
> uncovered functions successfully, but without locations it's really
hard
> to do anything with that information.
>
> I've built with -gline-tables-only, as is the default when building
llvm
> with sanitizers enabled.
>
> Have you seen this before? Am I doing something obviously wrong?
>
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Justin,

I haven't seen this before. I suspect it is because of line-tables-only.
Can you try it with full debug info?

On Tue, Mar 7, 2017 at 12:36 PM Kostya Serebryany <kcc at google.com>
wrote:
> +aizatsky
>
> On Tue, Mar 7, 2017 at 12:34 PM, Justin Bogner <mail at
justinbogner.com>
> wrote:
>
> I'm working on a fuzzer using libFuzzer and I wanted to take a look at
> how my coverage was doing, as per the instructions here:
>
>   http://llvm.org/docs/LibFuzzer.html#how-good-is-my-fuzzer
>
> First of all, I suspect the instructions there are out of date, but
> passing -dump_coverage=1 to the binary rather than setting ASAN_OPTIONS
> generated a .sancov file for me.
>
> However, when I inspect this with the sancov tool, all of the line
> numbers it reports are "<invalid>:0". I can list the
covered and
> uncovered functions successfully, but without locations it's really
hard
> to do anything with that information.
>
> I've built with -gline-tables-only, as is the default when building
llvm
> with sanitizers enabled.
>
> Have you seen this before? Am I doing something obviously wrong?
>
>
> --
Mike
Sent from phone
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