libsanitizer merge from upstream r208536

[Paolo Carlini]

Hi,

On 05/23/2014 10:50 AM, Yury Gribov wrote:
> Paolo,
>
> I've checked all available systems and wasn't able to repro this.
Given your exchanges with Jakub I thought that at this point it was 
clear that the issue is real.
> Every time vDSO was already filtered with
>
>   if (!info->dlpi_name || info->dlpi_name[0] == 0)
>     return 0;
>
> in FindFirstDSOCallback.
>
> Could you provide additional details of your setup? Or perhaps print 
> dlpi_name of offending library?
How do I print dlpi_name? And which detail do you want? It's a very, 
very, standard Linux machine, running a 3.11.10 kernel and a 2.18 glibc, 
two days ago everything was fine, 4_9-branch is fine.

Paolo.