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Bug#458133: Details, please

On Mon, Dec 31, 2007 at 01:00:10PM -0600, Steve M. Robbins wrote:
> > 00:05 < pusling> lamont: what is "bus error" on hppa ?
> > 00:06 < lamont> pusling: unaligned load/store
> > 00:06 < lamont> pusling: more specically, valid address, permission fault
> > 00:06 < pusling> lamont: is unaligned load/store enough to make builds fail ?
> > 00:06 < lamont> pusling: was - I turned that off rather recently
> So it sounds to me like there are two issues:
>   1.  There is a bug, somewhere, that is generating an unaligned access


>   2.  HPPA can be configured to handle, somehow, unaligned accesses.

the default mode is for unaligned accesses to be trapped, logged and emulated.
lamont sets it to coredump for ease of getting a backtrace on the

> Your contention is that HPPA buildd machines should be reconfigured to
> handle unaligned access.  That's fair enough, though in the past it
> has been claimed that this imposes a large performance penalty [1].

indeed it does. unaligned accesses are definitely a bug, unfortunately
lacking manpower to fix all of them.

> Irrespective of how the buildd machines are configured, however, there
> is a bug.  I think it should be tracked.


> [1] http://lists.debian.org/debian-devel/2007/11/msg00871.html
> -Steve

cheers, kyle

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