Bug#495007: libc6: getaddrinfo_a causes SetFault in amd64 version

[Jon Meredith <jmeredith@thehive.com>]

Hi Aurelien,

The linuxthreads was a red herring - it's with NPTL.  I don't think  
that the Debian package patches the section of code with problems, I  
think it's in the upstream source.   The code sample we gave  
definitely crashes on a vanilla lenny install so we thought you'd be  
interested in the patch (and it seemed like the fix would trickle  
through faster if we reported it to you).

Many thanks, Jon.


On Aug 13, 2008, at 7:10 PM, Aurelien Jarno wrote:

> On Wed, Aug 13, 2008 at 08:23:31PM -0400, Matthew Von-Maszewski wrote:
> > Aurelien,
> >
> > I doubt "linuxthreads" is anything but an old directory being reused.
> > The file gai_misc.h appears in two places.  The one I mention below  
> > in
> > the debian and another in the ./resolve directory.  The debian tree
> > version appears to be someone's attempt at optimizing memory usage on
> > the secondary thread.  The debian version overrides the libc/resolve
> > version. The secondary thread is created by a conventional pthreads
> > call (again unrelated to "linuxthreads").
>
> I don't understand why you are speaking about a debian version, debian
> does not patch this file, so there is nothing about optimizing memory
> usage.
>
> > The reduced stack size is now being pounded by what appears to be a
> > ton of relatively new getaddrinfo code.  __res_vinit() has a large
> > buffer it takes out of the stack.  It makes sense that the stack is
> > now to small.
> >
> > I ask that you give the bug serious consideration as written.  I
>
> I haven't found yet a time to get a closer look, but your analysis  
> seems
> to be wrong given that:
> - we are not using the linuxthreads anymore
> - we do not change gai_misc.h
>
> I'll have a closer look tomorrow.
>
> --
>  .''`.  Aurelien Jarno	            | GPG: 1024D/F1BCDB73
> : :' :  Debian developer           | Electrical Engineer
> `. `'   aurel32@debian.org         | aurelien@aurel32.net
>   `-    people.debian.org/~aurel32 | www.aurel32.net