[llvm-dev] Possible UB in reading coverage mapping with compressed function names

[Xinliang David Li via llvm-dev]

I will try to take a look at it some time this week.

David

On Mon, Apr 18, 2016 at 8:12 PM, Igor Kudrin <ikudrin.dev at gmail.com> wrote:

> Hi David, Vedant,
>
> It looks like we might have UB somewhere connected with reading coverage
> mapping serialized in v2 format (with compressed function names).
>
> I committed my patch, r266436, using the current format for .covmapping
> file, and then buildbots complained about it:
> *
> http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/11935/steps/check-llvm%20ubsan/logs/stdio
> *
> http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap/builds/11460/steps/check-llvm%20ubsan/logs/stdio
>
> I tried to reproduce the issue locally, but didn't succeed. Anyway, I've
> reapplied my patch (r266620) using the old format
> for .covmapping, and buildbots are happy now.
>
> Could you take a look on that? Do you have any idea what might cause the
> problem?
>
> Best regards,
> Igor Kudrin
>
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