Thank you for the bug report. Could you please create an issue on here: https://github.com/open-mpi/ompi/issues ?
I will take a look, but its easier to keep track if there is an issue associated with the request. Best regards Edgar From: 'Cooper Burns' via Open MPI users <[email protected]> Sent: Wednesday, December 10, 2025 2:37 PM To: Open MPI Users <[email protected]> Subject: [OMPI users] Long file paths causing segfault Hello all - I am running into an issue with OpenMPI 5.0.6, 5.0.9 (latest) that looks like a bug in the MPI_File_open API. If I try to open a file where the provided filename is very long (on my system it looks like anything above 262ish characters has the issue) the MPI_File_open call just segfaults immediately. A small reproducer code is here: #include <mpi.h> #include <stdio.h> #include <string> int main (int argc, char** argv) { MPI_Init(&argc, &argv); MPI_File shortfile; MPI_File longfile; std::string long_filename = "longfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilenamelongfilename"; std::string short_filename = "testfile.txt"; printf("OPENING SHORT FILE\n"); int fopen_short_error = MPI_File_open(MPI_COMM_WORLD, short_filename.c_str(), MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &shortfile); printf("SHORT FILE OPENED\n"); MPI_File_close(&shortfile); printf("OPENING LONG FILE\n"); int fopen_long_error = MPI_File_open(MPI_COMM_WORLD, long_filename.c_str(), MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &longfile); printf("LONG FILE OPENED\n"); MPI_File_close(&longfile); MPI_Finalize(); } The output of this program is: OPENING SHORT FILE SHORT FILE OPENED OPENING LONG FILE [localhost:155795] *** Process received signal *** [localhost:155795] Signal: Segmentation fault (11) [localhost:155795] Signal code: (128) [localhost:155795] Failing at address: (nil) Segmentation fault (core dumped) Has anyone seen this error before? As far as I can tell this is not an issue with OpenMPI versions 4.x.x, and it is not a problem on MPICH, IntelMPI, or HPCX (which is based on OpenMPI 4.x.x). I have not tried any other MPI implementations. Thanks, Cooper -- Cooper Burns Team Lead - HPC Convergent Science, 6400 Enterprise Lane, Madison, WI 53719<https://maps.google.com/?q=6400+Enterprise+Lane,+Madison,+WI+53719&entry=gmail&source=g> Phone: (608) 230-1551<tel:(608)%2301551> Web<https://convergecfd.com/> | Linkedin<https://www.linkedin.com/company/convergent-science-inc> | Facebook<https://www.facebook.com/ConvergentScience/> | YouTube<https://www.youtube.com/convergecfd> -- Join us at the 2025 CONVERGE CFD Conference–Global! [https://ci3.googleusercontent.com/mail-sig/AIorK4wt8Cgn16BAx9UdmPXUjj-CnJwTO4E9IIK4HXR8rJtbMbW2tKWDGQg2tc_aJ8lAK98LrHGnb1fXUySj] CONFERENCE INFORMATION + REGISTRATION<https://events.ringcentral.com/events/cfd25/registration> To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]<mailto:[email protected]>. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
