Red Hat Bugzilla – Bug 1266505
Lapack bug in dsyevr function
Last modified: 2017-12-06 05:37:11 EST
Created attachment 1077084 [details]
Description of problem:
There seems to be a bug in dsyevr function in lapack that ships with RHEL6 but does not appear in 3.5.0 lapack (and therefore also in atlas so atlas would need a rebuild as well) - it's described at http://icl.cs.utk.edu/lapack-forum/viewtopic.php?f=2&t=4767 but I'll copy all of that here.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Compile attached program (gfortran test.f90 -llapack)
2. Run it, it will wait for input - give it:
4.0233725957917259288124166e-07 1.1475559753759016807209544e-22 3.1797364433177036979501603e-68
1.1475559753759016807209544e-22 4.0233725957917259288124166e-07 -7.5079600860804907344589960e-56
3.1797364433177036979501603e-68 -7.5079600860804907344589960e-56 4.3213250161962713132013381e-05
In the output you will see
dsyevr: info = 1
which, I am told, should not be there and indeed it is not with newer lapack, openblas or Intel's MKL.
No dsyevr: info = 1
Red Hat Enterprise Linux 6 is in the Production 3 Phase. During the Production 3 Phase, Critical impact Security Advisories (RHSAs) and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available.
The official life cycle policy can be reviewed here:
This issue does not meet the inclusion criteria for the Production 3 Phase and will be marked as CLOSED/WONTFIX. If this remains a critical requirement, please contact Red Hat Customer Support to request a re-evaluation of the issue, citing a clear business justification. Note that a strong business justification will be required for re-evaluation. Red Hat Customer Support can be contacted via the Red Hat Customer Portal at the following URL: