DGESV gives different results on subsequent runs

Hi,

I got a 181x181 system matrix AA and a 181x1 right hand side bb. In my test program (please see attachment) I solve this equation

system twice and I get two slightly different results. Are there any explanations for this ?

The test was carried out on Windows 10 and I used VS 2017 Version 19.13.26131.1  x86.

To compile and link please use:

cl /Fodgesv_test.obj /c dgesv_test.cpp /EHsc /IC:\<path to MKL headers>

link /nologo /OUT:dgesv_test.exe /LIBPATH:C:\<path to MKL libraries> mkl_intel_c.lib mkl_sequential.lib mkl_core.lib dgesv_test.obj

Then simply run dgesv_test.exe.

Any help is appreciated.

Regards