Your message dated Mon, 06 May 2013 10:49:28 +0000
with message-id <[email protected]>
and subject line Bug#693269: fixed in lapack 3.4.2+dfsg-1
has caused the Debian Bug report #693269,
regarding liblapack-dev: Some routines produce incorrect results in
multithreaded environment
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
693269: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=693269
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: liblapack-dev
Version: 3.3.1-1
Severity: normal
Tags: upstream
Dear Maintainer,
When writing code that uses Lapack as well as threads (pthreads or OpenMP),
certain routines, like the nonsymmetric eigensolver, produce incorrect results
due to statically allocated arrays. The Lapack source uses large local arrays
which are deemed by gfortran (by default) to be too large to allocate on the
stack, leading to statically allocated variables which are corrupted when
multiple threads write to them. Adding the "-frecursive" flag to the
compilation flags would force gfortran to always allocate the arrays on the
stack. The problem along with code to reproduce it has been listed in this
forum post:
http://icl.cs.utk.edu/lapack-forum/viewtopic.php?f=2&t=1930
The most ideal solution to the problem would be to modify the code to not use
huge local arrays, but the API makes it impossible for several routines.
Therefore, the use of compilation flags is a more immediate, but less elegant,
fix.
While I do not expect the addition of the flag to cause any side effects, there
are a number of potential concerns. FIrst, more stack space will be used by the
library. However, it will only be about a factor of 2 greater than the current
situation, since the default variable size limit is 32KB, and the largest
arrays in Lapack are around 64KB, and process stack size limits are in the
range of several MB. Second, if this bug is fixed in Debian and its
derivatives, porting scientific code that is affected by this bug to other
systems may lead to confusion if the bug still exists with other
platforms/compilers.
-- System Information:
Debian Release: wheezy/sid
APT prefers precise-updates
APT policy: (500, 'precise-updates'), (500, 'precise-security'), (500,
'precise')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-23-generic (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages liblapack-dev depends on:
ii libatlas-base-dev [libblas-3gf.so] 3.8.4-3build1
ii libblas-dev [libblas-3gf.so] 1.2.20110419-2ubuntu1
ii liblapack3gf 3.3.1-1
ii libopenblas-dev [libblas-3gf.so] 0.1alpha2.2-3
liblapack-dev recommends no packages.
liblapack-dev suggests no packages.
-- no debconf information
--- End Message ---
--- Begin Message ---
Source: lapack
Source-Version: 3.4.2+dfsg-1
We believe that the bug you reported is fixed in the latest version of
lapack, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Sylvestre Ledru <[email protected]> (supplier of updated lapack package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Format: 1.8
Date: Mon, 06 May 2013 11:39:13 +0200
Source: lapack
Binary: liblapack3 liblapack3gf liblapacke liblapacke-dev liblapack-dev
liblapack-pic liblapack-test liblapack-doc liblapack-doc-man
Architecture: source all amd64
Version: 3.4.2+dfsg-1
Distribution: unstable
Urgency: low
Maintainer: Debian Science Team
<[email protected]>
Changed-By: Sylvestre Ledru <[email protected]>
Description:
liblapack-dev - Library of linear algebra routines 3 - static version
liblapack-doc - Library of linear algebra routines 3 - documentation
liblapack-doc-man - Library of linear algebra routines 3 - documentation
(manual page
liblapack-pic - Library of linear algebra routines 3 - static PIC version
liblapack-test - Library of linear algebra routines 3 - testing programs
liblapack3 - Library of linear algebra routines 3 - shared version
liblapack3gf - Transitional package for liblapack3
liblapacke - Library of linear algebra routines 3 - C lib shared version
liblapacke-dev - Library of linear algebra routines 3 - Headers
Closes: 693269
Changes:
lapack (3.4.2+dfsg-1) unstable; urgency=low
.
[ Sébastien Villemot ]
* parallel_build.patch: improve patch by marking some Makefiles as not
parallelizable; should fix FTBFS on kfreebsd-*
.
[ Sylvestre Ledru ]
* Upload to unstable
* Some routines produced incorrect results in multithreaded environment
Thanks to Michael Banck for the fix (Closes: #693269)
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