[Pkg-scicomp-devel] Bug#569436: Bug#569436: lapack: zgesvd seems to give incorrect results

[Kumar Appaiah]

On Sat, Feb 13, 2010 at 04:12:49PM +0100, Sylvestre Ledru wrote:
> > Thanks for checking. Did you use amd64? Did you notice that the FTBFS
> > is on amd64?
> No, I just tried with i386. I did not see any reference that it was a amd64-only bug.

If you checked the reason why this bug was filed, Lucas says:

"During a rebuild of all packages in sid, your package failed to build
on amd64."

> > > Sylvestre
> > > PS: I changed the severity to "normal".
> > > FYI, grave means:
> > > "makes the package in question unusable or mostly so, or causes data
> > > loss, or introduces a security hole allowing access to the accounts of
> > > users who use the package."
> > 
> > Thanks for being pedantic without providing any alternate suggestions,
> You should relax. I didn't mean to be pedantic. I was just direct.
> And I am not providing suggestions, it is because I don't have any for
> now.

Thanks.

> > but without SVD, I'd say most of the math related packages are
> > unusable, since they give absurdly wrong results. But I won't play a
> > severity ping-pong although at least my work and my package(s) are
> > affected.
> > 
> > And, I just created a fresh amd64 chroot, and Octave gives me this:
> You confirm that you only get this bug while you are in a chroot ?

Yes. My working environment is not sid, so I cannot make any comments
on it.

> [...]
> 
> > Some help as to how to debug this package would be appreciated, since,
> > even according to your "definition" above, several packages are
> > unusable for me, and the bug is "grave" for me. I would really
> > appreciate some further pointers in finding where the issue is.
> You should contact upstream mailing list here.

Frankly, I think you could forward this bug to them on my behalf. But
then, let me try doing so myself; at least I consider the bug serious
enough to tackle now, since anyone who installs a fresh new sid
installation on amd64 is likely to be bitten with incorrect SVD
results unless he/she installs Atlas.

Kumar
-- 
If you shed tears when you miss the sun, you also miss the stars.
- Rabindranath Tagore (Stray Birds, 1916)
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