Public bug reported: On Ubuntu 20.04 (Focal Fossa), the following code:
https://pastebin.com/A0bTqAAJ gets stuck on the LAPACKE_dgesdd call using liblapacke-dev (3.9.0-1build1). It seems to get stuck for every matrix size N>=40. I've unsuccessfully tried out the following variations: * Different compilers (gcc-9, gcc-10, clang-10) * Linking to different BLAS implementations (libopenblas-dev, libblas-dev) * With and without Different optimization settings (-ffast-math, -march=native, -O3) The CPU is an AMD Ryzen9 3900X (in case that's relevant). What I've then tried is to build LAPACK(E) 3.9.0 from source directly using cmake and the "make.inc.example" file included in the LAPACK source code. And that compiled version works just fine! Maybe there is bad optimization done by the compiler used for the Ubuntu package? My C/C++ (let alone Fortran) knowledge is quite limited, which means I am going to need some help if I am to provide further debug information. ** Affects: lapack (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1875181 Title: dgesdd gets stuck for size 40+ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lapack/+bug/1875181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
