[llvm-dev] sancov reporting all locations as <invalid>:0

[Kostya Serebryany via llvm-dev]

+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 First of all, I suspect the instructions there are out of date, but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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