Re: 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
correct.
> 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
buildds.
> 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.
>
agreed.
> [1] http://lists.debian.org/debian-devel/2007/11/msg00871.html
>
> -Steve
cheers, kyle
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