If this is the problem, the attached patch may help -- it turns the
reinterpret_casts in the serialization of primitives into memcpys, which
shouldn't require alignment.

Josh

On Thu, Jul 8, 2010 at 8:44 AM, René Wagner <rene.wagner@dfki.de> wrote:

> On Thu, 2010-07-08 at 19:43 +0900, Daniel Stonier wrote:
> > Got into it with a debugger, and found it hanging at
> > roslib/include/ros/serialization.h at
> >
> >
> > ROS_CREATE_SIMPLE_SERIALIZER(double);
>
> Depending on how the serializer is used, this may result in an
> unaligned write. You can check whether an alignment error is involved
> as follows:
>
> echo 5 > /proc/cpu/alignment
>
> and re-run the executable that's causing trouble. The program should
> receive a signal (so you can see where exactly things go wrong in gdb)
> and the kernel should report an "Alignment trap: ..." on the console or
> in dmesg/syslog.
>
> Cheers,
>
> Rene
>
> --
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