[ros-users] Ros on Arm Hanging

Daniel Stonier d.stonier at gmail.com
Mon Jul 12 10:04:33 UTC 2010


On 12 July 2010 17:24, René Wagner <rene.wagner at dfki.de> wrote:

> On Fri, 2010-07-09 at 10:45 +0900, Daniel Stonier wrote:
> > - Patched (using the memcpy's rather than the reinterprets in the
> > SERIALIZER macro).
> > - In signal+warn mode (echo 5 > /proc/cpu/alignment)
> >   - (float64&int32) client gives a bus error and kernel outputs an
> > alignment trap message, but servers are fine
> > - In default mode (echo 0 > /proc/cpu/alignment)
> >   - (float64&int32) client and server function without hanging like
> before
> >
> > So...its working, but is this the right fix?
>
> You probably want to check where the unaligned memory access is
> happening. Can you run your float_client from within gdb? This should
> allow you to get a backtrace once the kernel has sent the signal (bus
> error) from the alignment trap.
>
> Cheers,
>
> Rene
>
> Getting some more meaningful backtraces now - catch bus errors for both the
float64's and the int32's in some cases, some with, some without that
memcopy patch above. I'll put together some results when I get back to work
in the morning.




> -
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