updated on June 18 2016

maintained by Julien Langou, U. Colorado Denver and Julie Langou, U. Tennessee

RED means BUG WAS CONFIRMED but IT IS STILL HERE

MARRON means BUG WAS NOT CONFIRMED

GREEN means BUG WAS CORRECTED :

  • CONFIRMED

  • Present in LAPACK 3.6.0

  • Bug reported by Ren-Cang Li in 2016 to Julien

  • See email to LAPACK team

  • Assigned to Osni.

  • Osni: We have a new subroutine to replace the subroutine causing us trouble.  We will be sitting together (OM and Prof. Parlett) tomorrow to discuss how this will behave.

  • I expect the new version of the subroutine will fix bug 113

  • 02/10/16 Osni: The bug has been traced to the factorization(s) performed by dlarrf.

  • The current implementation of dlarrf can lead to NaNs or element growth (this is expected) but the tests to deal with these cases are not working properly.

  • Beresford and I have experimented changing a few things in dlarrf, which fixes this bug and also bug 126, but we know that a more robust strategy needs to be devised. 

  • 2/11/16: We were able to trace the issue down here to the factorizations. We have some tests to cope with extreme growth in elements and NaNs,

  • but these tests are not robust. So we end up with linearly dependent eigenvectors when eigenvalues are close to each other.

  • 5/9/16: (Osni) We had a meeting in Berkeley (Prof. Parlett, Jim, Osni, I Dhillon) Some safeguards were removed over the years thinking we did not need them;

  • perhaps they must come back (this was the focus of our discussion). For some matrices, the vectors that are returned are not orthogonal the way we would

  • like them to be---the level of orthogonality is not ideal for nearly multiple eigenvalues. Prof Parlett and I will sit together to determine the best strategy for future LAPACK release.

bug 158 problem with DC SVD least squares

  • CONFIRMED

  • Present in LAPACK 3.6.0

  • Bug reported by Ren-Cang Li in 2016 to Julien

  • See email to LAPACK team

  • Assigned to Osni.

bug 130 :: Ambiguous lapacke interfaces to Cosine/Sine decomposition - 2 Trans parameters

  • CONFIRMED on Jun 24th 2015

  • Present in LAPACK 3.5.0

  • Bug reported by Miroslav Ilias on Jun 27th

  • Link: http://icl.cs.utk.edu/lapack-forum/viewtopic.php?f=2&t=1820

  • Assigned to Osni

  • 02/10/16 Osni: The bug is actually not related to splitting but rather a misbehaviour of dlarrf; see bug 113.

  • SEE BUG 113 for all updates (will be closed along with 113)

bug116 :: ZGGEV fails but Matlab works

bug0061 :: zgehrd.f is overflowing

  • CONFIRMED

  • bug report by Victor Liu on Tuesday August 03rd, 2010

  • zgehrd.f is overflowing the maximum size in bytes of the largest array that

  • can be put on the stack with gfortran (⇒ leads ,e.g., to non-reproducible and uncorrect execution

  • of zgeev in multithreaded context

  • lapackers involved in the bug fix process: Julie and Julien Langou and Mathieu Faverge

  • bug fix by Victor Liu on Wednesday August 04th, 2010

  • Assigned to Julien (UC Denver) on Feb 11th 2015

  • see forum topic 1930

  • two outstanding issues: (1) how do we go to fix this?, (2) more LAPACK subroutines might be concerned.