topic Re: ztrsm crashes on some inputs with the debug flags in Intel® oneAPI Math Kernel Library

ztrsm crashes on some inputs with the debug flags

ansobolev — Mon, 16 Mar 2026 11:27:17 GMT

Hi,

I've experienced an issue when ztrsm crashes on some inputs with `-fpe0` flag enabled, while dtrsm does not. The inputs to both subroutines are the same up to the zero complex part. Without `-fpe0` flag the outputs of ztrsm and dtrsm are the same, as they should be.

This happens with 2025.3.2, 2025.3.0 and 2024.2.1, which are the versions I have access to. Can you please check? The MWE with the inputs is attached below. The two Fortran files that are in the archive can be compiled with

```

ifx -qmkl -O0 -fpe0 -o run_ztrsm_cplx run_ztrsm_cplx.f90

ifx -qmkl -O0 -fpe0 -o run_ztrsm_real run_ztrsm_real.f90

```

Thanks in advance!

Re: ztrsm crashes on some inputs with the debug flags

Fengrui — Mon, 16 Mar 2026 18:42:50 GMT

Hi, thanks for reporting this issue in the forum!

I can reproduce this issue with the AVX2 code path while the AVX512 code path seems fine with the 2025.3 release. It is a regression since the 2024.2 release. We are actively working on this issue. Will update here once we get it fixed.

Thanks!

Fengrui

Re: ztrsm crashes on some inputs with the debug flags

Fengrui — Wed, 18 Mar 2026 16:48:13 GMT

This issue has been fixed. The fix will be included in the upcoming 2026.0 release.

Thanks again for reporting this issue!