[Numpy-discussion] debian floating point exceptions/numpy/f2py -- sse

Andrew Straw strawman at astraw.com
Fri Jul 14 11:28:57 CDT 2006


GNU libc version 2.3.2 has a bug[1] "feclearexcept() error on CPUs with
SSE" (fixed in 2.3.3) which has been submitted to Debian[2] but not
fixed in sarge.

See http://www.its.caltech.edu/~astraw/coding.html#id3 for more
information and .debs which fix the problem.

[1] http://sources.redhat.com/bugzilla/show_bug.cgi?id=10
[2] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=279294

If only somebody could show how this was a security issue, we could get
Debian to finally release a fix in sarge for this (frequently asked)
question.

Andrew Jaffe wrote:
> Hi All,
>
> I have just switched from RHEL to debian, and all of a sudden I started 
> getting floating point exception errors in various contexts.
>
> Apparently, this has to do with some faulty error stuff in glibc, 
> specifically related to the sse. I would prefer to fix the actual 
> problem, but I can't seem to be able to get the recommended 'apt-get 
> source glibc' incantation to work (I'm not root, but I can sudo.)
>
> I was able to fix some of these issues by simply downgrading ATLAS to 
> not use sse instructions anymore.
>
> But f2py still links with sse and sse2 by default. I can't quite 
> understand the configuration well enough to work out how to turn it off. 
> Can someone give me any guidance?
>
> Thanks,
>
> Andrew
>
>
>
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