Problem in running example

Running and Runtime Errors
1

Versions

FLUKA:4-5.1
Flair:
Operating system: macOS
Compiler:

Description

Hello,

I am a beginner user of FLUKA. I have installed FLUKA and tried to run one of the example input files from the FLUKA examples library. but the simulation gets stuck at cycle 1 and does not progress even with a very low number of primary histories (START 100). I have waited for more than an hour with no change in the output. so I am kind asking for advice to solve it.

Screenshot 2026-01-11 at 10.44.15 AM
Screenshot 2026-01-11 at 10.44.15 AM1454×570 168 KB

Input files

gcrexampleAllParticle.inp (3.9 KB)

Please upload all relevant files. (FLUKA input file, Flair project file, user routines, and data files)

2

Dear Tahany,

Please upload the .out, .log, and .err files to see the error message you are getting. They may be located in a fluka_xxxxx directory.

Cheers,
David

3

Dear David,

Thank you for your kind reply!

in the .log file I got this massage

“Program received signal SIGILL: Illegal instruction. Backtrace for this error: Program received signal SIGBUS: Access to an undefined portion of a memory object. “

After checking my setup, I realized that I was using gfortran 15, which wasn’t compatible with the FLUKA version I am running. I switched to gfortran 13, and the issue was resolved successfully.

Thank you very much for your time and consideration.

Kind regards,
Tahany

5

Hi @tabdelha ,

There shouldn’t be any issues with GFortran 15.

Could you please provide the output of these commands, so we can investigate this issue further?

uname -a
sw_vers -productVersion
pkgutil --pkg-info=com.apple.pkg.CLTools_Executables
gfortran -v
echo $PATH
port echo requested
port select --summary

Thank you

6

Hello Luigi,

Here are the outputs of the commands you requested. please check and let me know if you need further details:

uname -a

Darwin Tahanys-MacBook-Pro.local 23.5.0 Darwin Kernel Version 23.5.0: Wed May 1 20:19:05 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T8112 arm64

sw_vers -productVersion

14.5

pkgutil --pkg-info=com.apple.pkg.CLTools_Executables

package-id: com.apple.pkg.CLTools_Executables

version: 15.3.0.0.1.1708646388

volume: /

location: /

install-time: 1710605945

gfortran -v

Using built-in specs.

COLLECT_GCC=gfortran

COLLECT_LTO_WRAPPER=/opt/homebrew/Cellar/gcc/15.2.0/bin/../libexec/gcc/aarch64-apple-darwin23/15/lto-wrapper

Target: aarch64-apple-darwin23

Configured with: ../configure --prefix=/opt/homebrew/opt/gcc --libdir=/opt/homebrew/opt/gcc/lib/gcc/current --disable-nls --enable-checking=release --with-gcc-major-version-only --enable-languages=c,c++,objc,obj-c++,fortran,m2 --program-suffix=-15 --with-gmp=/opt/homebrew/opt/gmp --with-mpfr=/opt/homebrew/opt/mpfr --with-mpc=/opt/homebrew/opt/libmpc --with-isl=/opt/homebrew/opt/isl --with-zstd=/opt/homebrew/opt/zstd --with-pkgversion=‘Homebrew GCC 15.2.0’ --with-bugurl=GitHub · Where software is built --with-system-zlib --build=aarch64-apple-darwin23 --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk

Thread model: posix

Supported LTO compression algorithms: zlib zstd

gcc version 15.2.0 (Homebrew GCC 15.2.0)

port echo requested

gcc12 @12.4.0_2+stdlib_flag

gcc13 @13.4.0_1+stdlib_flag

gcc_select @0.1_10

py311-numpy @2.3.4_0+accelerate+gfortran

py311-Pillow @9.5.0_1

py311-tkinter @3.11.14_0

python311 @3.11.14_0+lto+optimizations

port select --summary

Name Selected Options

==== ======== =======

gcc mp-gcc13 mp-gcc12 mp-gcc13 none

python python311 python311 none

python3 none python311 none

Best wishes,

Tahany

7

Dear @tabdelha,

You’re using a mixed environment with MacPorts and Homebrew which can cause issues with the FLUKA/Flair problem as discussed in several forum threads.

I believe the original issue with gfortran15 was related to this. Generally, it’s better to have a single package manager or clearly separate environments as outlined here:

Best, Luigi