I experienced the same problem with the routine LAPACKE_dsyevd with a 6x6 matrix. I tried to check the eigenvalues with GNU/Octave and .. it got stuck as well! The code was working a few days ago with Ubuntu 19.10 before the upgrade to 20.04.
The backtrace is: #0 0x00007ffff599f70b in sched_yield () at ../sysdeps/unix/syscall-template.S:78 #1 0x00007ffff614cfa5 in exec_blas_async_wait () from /usr/lib/x86_64-linux-gnu/libopenblas.so.0 #2 0x00007ffff614d07c in exec_blas () from /usr/lib/x86_64-linux-gnu/libopenblas.so.0 #3 0x00007ffff5f693cc in dsymv_thread_U () from /usr/lib/x86_64-linux-gnu/libopenblas.so.0 #4 0x00007ffff5f251ae in dsymv_ () from /usr/lib/x86_64-linux-gnu/libopenblas.so.0 #5 0x00007ffff7ad09f5 in dsytd2_ () from /usr/lib/x86_64-linux-gnu/libopenblas.so.0 #6 0x00007ffff7ad536d in dsytrd_ () from /usr/lib/x86_64-linux-gnu/libopenblas.so.0 #7 0x00007ffff7ac66cc in dsyevd_ () from /usr/lib/x86_64-linux-gnu/libopenblas.so.0 #8 0x00007ffff5cd76e0 in LAPACKE_dsyevd_work () from /usr/lib/x86_64-linux-gnu/liblapacke.so.3 #9 0x00007ffff5cd70b7 in LAPACKE_dsyevd () from /usr/lib/x86_64-linux-gnu/liblapacke.so.3 -- 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
