MATLAB 2025a segfaults on Ubuntu when handling Fortran MEX files with internal subroutines

This is very likely a bug of MATLAB R2025a on Ubuntu. I would like to know whether anyone else can reproduce it (on Ubuntu). Thanks. In brief, if the Fortran MEX file contains an internal subroutine used as an actual argument to another subroutine, then MATLAB R2025a encounters a segfault under Ubuntu 22.04 and 24.04. Previous versions of MATLAB work without a problem (I have tested R2024a and R2024b). Windows and macOS have not been tested.To reproduce the issue, execute the following in the MATLAB command window:mex('-v', '-g', 'optimize.F90'); optimize();where optimize.F90 is the following Fortran MEX file (see also https://github.com/zequipe/test_matlab/blob/master/segfault_2025a/optimize.F90). In particular, it uses an internal subroutine as an input for a subroutine, which is allowed in Fortran 2008+. This MEX file used to work withtout any problem until I updated to MATLAB R2025a. The crash log is also attached at the end of this post (see also https://github.com/zequipe/test_matlab/tree/master/segfault_2025a#readme). For more details, see https://github.com/zequipe/test_matlab/tree/master/segfault_2025aAny comments or criticism will be appreciated. Thanks. !----------------------------------------------------------------------!! optimize.F90: a Fortran MEX file demonstrating a bug of MATLAB R2025a.! To test, do the following in the MATLAB command window:!! mex-g optimize.F90; optimize(); !! In MATLAB R2025a under Ubuntu 24.04 with gfortran 13.3.0, this causes! a segmentation fault. In earlier versions of MATLAB, it works fine.!----------------------------------------------------------------------!#include "fintrf.h"!----------------------------------------------------------------------!! solver_mod: a module defining an optimization solvermodule solver_modimplicit noneprivatepublic:: solverabstract interface! OBJ: an abstract interface for an objective functionsubroutine OBJ(x, y)real, intent(in):: xreal, intent(out):: yend subroutine OBJend interfacecontains! solver: a doing-nothing solver for demonstration. Its interface CANNOT! be changed, e.g., to accept a hyper-parameter for `objective`.subroutine solver(objective)procedure(OBJ):: objectivereal f! The following line causes a segmentation fault in MATLAB R2025a when! `solver(objective)` is called from `mexFunction`.call objective(0.0, f)end subroutine solverend module solver_mod!----------------------------------------------------------------------!!----------------------------------------------------------------------!! mexFunction: the entry point for the MEX function `optimize`, which! calls `solver` from solver_mod to optimize `objective`.subroutine mexFunction(nlhs, plhs, nrhs, prhs)use solver_mod, only: solverimplicit noneinteger nlhs, nrhsmwPointer plhs(*), prhs(*)! `hyper_parameter`: a hyper-parameter for the objective function. In! real applications, this parameter is not a constant, but a variable! depending on the input arguments of `mexFunction`.real hyper_parameter, fhyper_parameter = 42! The following line works fine.call objective(0.0, f)! The following line causes a segmentation fault in MATLAB R2025a.call solver(objective)contains!--------------------------------------------------------------!! objective: a simple objective function for demonstration.! F2008 allows to pass internal procedures as actual arguments.! See Note 12.18 on page 290 of WD 1539-1 J3/10-007r1 (F2008! Working Document). We implement `objective` internally so that! `hyper_parameter` is visible to it. Do NOT pass this parameter! by a module variable, which is thread-unsafe.subroutine objective(x, y)real, intent(in):: xreal, intent(out):: yy = (x+hyper_parameter)**2end subroutine objective!--------------------------------------------------------------!end subroutine mexFunction!----------------------------------------------------------------------!The output of mex('-v', '-g', 'optimize.F90'); optimize(); Verbose mode is on.No MEX options file identified; looking for an implicit selection.... Looking for compiler 'gfortran' ...... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').... Looking for folder '/usr/bin' ...Yes.... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').... Executing command 'gfortran -print-file-name=libgfortran.so' ...Yes ('/usr/lib/gcc/x86_64-linux-gnu/10/libgfortran.so').... Looking for folder '/usr/lib/x86_64-linux-gnu' ...Yes.... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').... Executing command 'gfortran -dumpversion | awk -F '.' '$1>=6' ' ...Yes ('10').Found installed compiler 'gfortran'.... Looking for compiler 'gfortran6-' ...... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').... Looking for folder '/usr/bin' ...Yes.... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').... Executing command 'gfortran -print-file-name=libgfortran.so' ...Yes ('/usr/lib/gcc/x86_64-linux-gnu/10/libgfortran.so').... Looking for folder '/usr/lib/x86_64-linux-gnu' ...Yes.... Executing command 'which gfortran' ...Yes ('/usr/bin/gfortran').... Executing command 'gfortran -print-file-name=libgfortranbegin.a' ...Yes ('libgfortranbegin.a').... Looking for folder 'libgfortranbegin.a' ...No.Did not find installed compiler 'gfortran6-'.Options file details-------------------------------------------------------------------Compiler location: /usr/binOptions file: /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/mexopts/gfortran6.xmlCMDLINE2 : /usr/bin/gfortran -pthread -shared -g -Wl,--version-script,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/lib/glnxa64/fortran_exportsmexfileversion.map /tmp/mex_1037477951999_9281/optimize.o /tmp/mex_1037477951999_9281/fortran_mexapi_version.o -Wl,-rpath-link,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64 -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig" -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64" "/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig/libstdc++.so.6" -lmx -lmex -lmat -lm -L"/usr/lib/x86_64-linux-gnu" -lgfortran -z noexecstack -o optimize.mexa64FC : /usr/bin/gfortranDEFINES : -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD FFLAGS : -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -fallow-argument-mismatch -fdefault-integer-8INCLUDE : -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/include" -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/simulink/include"FOPTIMFLAGS : -O2FDEBUGFLAGS : -gLDF : /usr/bin/gfortranLDFLAGS : -pthreadLDTYPE : -sharedLINKEXPORT : -Wl,--version-script,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/lib/glnxa64/fexport.mapLINKEXPORTVER : -Wl,--version-script,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/lib/glnxa64/fortran_exportsmexfileversion.mapMWCPPLIB : "/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig/libstdc++.so.6"LINKLIBS : -Wl,-rpath-link,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64 -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig" -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64" "/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig/libstdc++.so.6" -lmx -lmex -lmat -lm -L"/usr/lib/x86_64-linux-gnu" -lgfortranLDOPTIMFLAGS : -OLDDEBUGFLAGS : -gMW_GLIBC_SHIM : $MW_GLIBC_SHIMLDEXECSTACK : -z noexecstackOBJEXT : .oLDEXT : .mexa64SETENV : FC="/usr/bin/gfortran" FFLAGS="-fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -fallow-argument-mismatch -fdefault-integer-8 -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD " FOPTIMFLAGS="-O2" FDEBUGFLAGS="-g" LD="/usr/bin/gfortran" LDFLAGS="-pthread -shared -Wl,-rpath-link,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64 -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig" -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64" "/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig/libstdc++.so.6" -lmx -lmex -lmat -lm -L"/usr/lib/x86_64-linux-gnu" -lgfortran -Wl,--version-script,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/lib/glnxa64/fexport.map" LDDEBUGFLAGS="-g"GFORTRAN_INSTALLDIR : /usr/binGFORTRAN_EXECUTABLE : /usr/bin/gfortranGFORTRAN_LIBDIR : /usr/lib/x86_64-linux-gnuGFORTRAN_VERSION : 10MATLABROOT : /opt/hostedtoolcache/MATLAB/2025.1.999/x64ARCH : glnxa64SRC : "/home/runner/work/test_matlab/test_matlab/segfault_2025a/optimize.F90";"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/version/fortran_mexapi_version.F"OBJ : /tmp/mex_1037477951999_9281/optimize.o;/tmp/mex_1037477951999_9281/fortran_mexapi_version.oOBJS : /tmp/mex_1037477951999_9281/optimize.o /tmp/mex_1037477951999_9281/fortran_mexapi_version.o SRCROOT : /home/runner/work/test_matlab/test_matlab/segfault_2025a/optimizeDEF : /tmp/mex_1037477951999_9281/optimize.defEXP : "optimize.exp"LIB : "optimize.lib"EXE : optimize.mexa64ILK : "optimize.ilk"TEMPNAME : optimizeEXEDIR : EXENAME : optimizeMANIFEST : "optimize.mexa64.manifest"OPTIM : -gLINKOPTIM : -gCMDLINE1_0 : /usr/bin/gfortran -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/include" -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/simulink/include" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -fallow-argument-mismatch -fdefault-integer-8 -g "/home/runner/work/test_matlab/test_matlab/segfault_2025a/optimize.F90" -o /tmp/mex_1037477951999_9281/optimize.oCMDLINE1_1 : /usr/bin/gfortran -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/include" -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/simulink/include" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -fallow-argument-mismatch -fdefault-integer-8 -g "/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/version/fortran_mexapi_version.F" -o /tmp/mex_1037477951999_9281/fortran_mexapi_version.o-------------------------------------------------------------------Building with 'gfortran'./usr/bin/gfortran -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/include" -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/simulink/include" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -fallow-argument-mismatch -fdefault-integer-8 -g "/home/runner/work/test_matlab/test_matlab/segfault_2025a/optimize.F90" -o /tmp/mex_1037477951999_9281/optimize.of951: Warning: Nonexistent include directory /opt/hostedtoolcache/MATLAB/2025.1.999/x64/simulink/include [-Wmissing-include-dirs]/usr/bin/gfortran -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/include" -I"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/simulink/include" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -fallow-argument-mismatch -fdefault-integer-8 -g "/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/version/fortran_mexapi_version.F" -o /tmp/mex_1037477951999_9281/fortran_mexapi_version.of951: Warning: Nonexistent include directory /opt/hostedtoolcache/MATLAB/2025.1.999/x64/simulink/include [-Wmissing-include-dirs]{ "bundle.symbolic_name" : "be8e5504-e0f7-492e-b08a-03d11430c8f2", "mw" : { "mex" : { "apiVersion" : 0, "release" : "R2025a", "threadpoolSafe" : 0 } } }/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/usResourceCompiler3 --manifest-add /tmp/mex_1037477951999_9281//mw_mex_tempmex_manifest.json --bundle-name mexVersioning --out-file /tmp/mex_1037477951999_9281//mw_mex_tempmex_bundle.zip/usr/bin/gfortran -pthread -shared -g -Wl,--version-script,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/extern/lib/glnxa64/fortran_exportsmexfileversion.map /tmp/mex_1037477951999_9281/optimize.o /tmp/mex_1037477951999_9281/fortran_mexapi_version.o -Wl,-rpath-link,/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64 -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig" -L"/opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64" "/opt/hostedtoolcache/MATLAB/2025.1.999/x64/sys/os/glnxa64/orig/libstdc++.so.6" -lmx -lmex -lmat -lm -L"/usr/lib/x86_64-linux-gnu" -lgfortran -z noexecstack -o optimize.mexa64 -Wl,--format=binary -Wl,/tmp/mex_1037477951999_9281//mw_mex_tempmex_bundle.zip -Wl,--format=default MEX completed successfully.-------------------------------------------------------------------------------- Segmentation violation detected at 2025-07-11 16:58:56 +0000--------------------------------------------------------------------------------Configuration: Crash Decoding : Disabled - No sandbox or build area path Crash Mode : continue (default) Default Encoding : UTF-8 Deployed : false GNU C Library : 2.39 stable Graphics Driver : Uninitialized software Graphics card 1 : 0x1414 ( 0x1414 ) 0x5353 Version 0.0.0.0 (0-0-0) MATLAB Architecture : glnxa64 MATLAB Entitlement ID : 11373431 MATLAB Root : /opt/hostedtoolcache/MATLAB/2025.1.999/x64 MATLAB Version : 25.1.0.2943329 (R2025a) OpenGL : software Operating System : Ubuntu 24.04.2 LTS Process ID : 9281 Processor ID : x86 Family 25 Model 1 Stepping 1, AuthenticAMD Session Key : 40xq29adxbsbdw85fpki4ykis Window System : No active displayFault Count: 1Abnormal termination:Segmentation violationCurrent Thread: 'MCR 0 interpret' id 140534882498240Register State (from fault): RAX = 00007fd0d3bf873c RBX = 00007fd0d3bf8910 RCX = 00007fd0ca49f11c RDX = 00007fd0d3bf8774 RSP = 00007fd0d3bf8718 RBP = 00007fd0d3bf8740 RSI = 00007fd0d3bf873c RDI = 00007fd0ca4a0000 R8 = 00007fd0d3bf8a00 R9 = 0000000000000000 R10 = 00007fd0d3bf8770 R11 = 0000000000000246 R12 = 00007fd0d3bf8900 R13 = 0000000000000000 R14 = 00007fd0d3bf8a00 R15 = 00007fd0d3bf8970 RIP = 00007fd0d3bf8774 EFL = 0000000000010202 CS = 0033 FS = 0000 GS = 0000Stack Trace (from fault):[ 0] 0x00007fd0d3bf8774 +00000000[ 1] 0x00007fd0ca49f1d2 /home/runner/work/test_matlab/test_matlab/segfault_2025a/optimize.mexa64+00004562 mexfunction_+00000132[ 2] 0x00007fd12df672d2 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmex.so+00975570[ 3] 0x00007fd12df67358 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmex.so+00975704[ 4] 0x00007fd12df67015 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmex.so+00974869[ 5] 0x00007fd12df681a4 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmex.so+00979364[ 6] 0x00007fd12df524fa /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmex.so+00890106[ 7] 0x00007fd12e77a4fe /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_dispatcher.so+01549566 _ZN8Mfh_file20dispatch_file_commonEMS_FviPP11mxArray_tagiS2_EiS2_iS2_+00000142[ 8] 0x00007fd12e77bc9a /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_dispatcher.so+01555610[ 9] 0x00007fd12e77c04e /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_dispatcher.so+01556558 _ZN8Mfh_file8dispatchEiPSt10unique_ptrI11mxArray_tagN6matrix6detail17mxDestroy_deleterEEiPPS1_+00000030[ 10] 0x00007fd12d8757a7 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+02578343[ 11] 0x00007fd120762fd0 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+11939792[ 12] 0x00007fd1207566da /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+11888346[ 13] 0x00007fd1206d9fd1 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+11378641[ 14] 0x00007fd1203c86cb /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08160971[ 15] 0x00007fd1203ca41c /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08168476[ 16] 0x00007fd1203c71ff /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08155647[ 17] 0x00007fd1203d8c55 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08227925[ 18] 0x00007fd1203d94a9 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08230057[ 19] 0x00007fd1203c6ff4 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08155124[ 20] 0x00007fd1203c70ff /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08155391[ 21] 0x00007fd12053583b /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+09656379[ 22] 0x00007fd12053a7e4 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+09676772[ 23] 0x00007fd12da0b9b4 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+04241844[ 24] 0x00007fd12d863683 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+02504323[ 25] 0x00007fd12d865c05 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+02513925[ 26] 0x00007fd12e77a4fe /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_dispatcher.so+01549566 _ZN8Mfh_file20dispatch_file_commonEMS_FviPP11mxArray_tagiS2_EiS2_iS2_+00000142[ 27] 0x00007fd12e77bc9a /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_dispatcher.so+01555610[ 28] 0x00007fd12e77c04e /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_dispatcher.so+01556558 _ZN8Mfh_file8dispatchEiPSt10unique_ptrI11mxArray_tagN6matrix6detail17mxDestroy_deleterEEiPPS1_+00000030[ 29] 0x00007fd12d8757a7 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+02578343[ 30] 0x00007fd120762fd0 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+11939792[ 31] 0x00007fd1207566da /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+11888346[ 32] 0x00007fd1206d9fd1 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+11378641[ 33] 0x00007fd1203c86cb /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08160971[ 34] 0x00007fd1203ca41c /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08168476[ 35] 0x00007fd1203c71ff /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08155647[ 36] 0x00007fd1203d8c55 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08227925[ 37] 0x00007fd1203d94a9 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08230057[ 38] 0x00007fd1203c6ff4 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08155124[ 39] 0x00007fd1203c70ff /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+08155391[ 40] 0x00007fd12053583b /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+09656379[ 41] 0x00007fd12053a7e4 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_lxe.so+09676772[ 42] 0x00007fd12da0b9b4 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+04241844[ 43] 0x00007fd12d8df311 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+03011345[ 44] 0x00007fd12d8df50d /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+03011853[ 45] 0x00007fd12d9ac31d /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+03851037[ 46] 0x00007fd12d9ac54e /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwlxemainservices.so+03851598[ 47] 0x00007fd12e356f0f /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwm_interpreter.so+01404687 _Z51inEvalCmdWithLocalReturnInDesiredWSAndPublishEventsRKNSt7__cxx1112basic_stringIDsSt11char_traitsIDsESaIDsEEEPibbP15inWorkSpace_tagN9MathWorks3lxe10EvalSourceE+00000063[ 48] 0x00007fd12eadeecc /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00974540 _ZNK3iqm18InternalEvalPlugin24inEvalCmdWithLocalReturnERKNSt7__cxx1112basic_stringIDsSt11char_traitsIDsESaIDsEEEP15inWorkSpace_tag+00000108[ 49] 0x00007fd12eadff35 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00978741 _ZN3iqm18InternalEvalPlugin7executeEP15inWorkSpace_tag+00000469[ 50] 0x00007fd12eac7716 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00878358[ 51] 0x00007fd12ea8c228 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00635432[ 52] 0x00007fd12ea8c571 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00636273[ 53] 0x00007fd13bf4954e /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmlutil.so+09737550 _ZNK14cmddistributor16IIPRunNowMessage7deliverERKN10foundation7msg_svc8exchange7RoutingE+00000030[ 54] 0x00007fd13d3629cc /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwms.so+03549644 _ZN10foundation7msg_svc8exchange12MessageQueue7deliverERKN7mwboost10shared_ptrIKNS1_8EnvelopeEEE+00000252[ 55] 0x00007fd13d36467f /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwms.so+03556991[ 56] 0x00007fd13d349f6d /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwms.so+03448685[ 57] 0x00007fd13d34ee74 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwms.so+03468916[ 58] 0x00007fd13d34911f /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwms.so+03445023[ 59] 0x00007fd13be86452 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmlutil.so+08938578[ 60] 0x00007fd13be8d3d1 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmlutil.so+08967121[ 61] 0x00007fd13ed2531e /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwrcf_framework.so+00312094 _ZN7mwboost6detail17shared_state_base13wait_internalERNS_11unique_lockINS_5mutexEEEb+00000222[ 62] 0x00007fd12e93c612 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmcr.so+00706066 _ZN7mwboost6futureIvE3getEv+00000098[ 63] 0x00007fd12e92ac0b /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmcr.so+00633867[ 64] 0x00007fd13e347897 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmvm.so+03438743 _ZN14cmddistributor15PackagedTaskIIP10invokeFuncIN7mwboost8functionIFvvEEEEENS2_10shared_ptrINS2_6futureIDTclfp_EEEEEERKT_+00000071[ 65] 0x00007fd13e347bc8 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmvm.so+03439560 _ZNSt17_Function_handlerIFN7mwboost3anyEvEZN14cmddistributor15PackagedTaskIIP10createFuncINS0_8functionIFvvEEEEESt8functionIS2_ET_EUlvE_E9_M_invokeERKSt9_Any_data+00000024[ 66] 0x00007fd12eae9e3b /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+01019451 _ZN3iqm18PackagedTaskPlugin7executeEP15inWorkSpace_tag+00000091[ 67] 0x00007fd12eac7716 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00878358[ 68] 0x00007fd12ea934f9 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00664825[ 69] 0x00007fd12e4ac0e9 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwbridge.so+00499945[ 70] 0x00007fd12e4ac5c3 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwbridge.so+00501187[ 71] 0x00007fd12e4c84ea /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwbridge.so+00615658 _Z22mnGetCommandLineBufferbRbN7mwboost8optionalIKP15inWorkSpace_tagEEbRKNS0_9function2IN6mlutil14cmddistributor17inExecutionStatusERKNSt7__cxx1112basic_stringIDsSt11char_traitsIDsESaIDsEEES4_EE+00000218[ 72] 0x00007fd12e4c8881 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwbridge.so+00616577 _Z8mnParserv+00000513[ 73] 0x00007fd12e964350 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmcr.so+00869200[ 74] 0x00007fd13e347897 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmvm.so+03438743 _ZN14cmddistributor15PackagedTaskIIP10invokeFuncIN7mwboost8functionIFvvEEEEENS2_10shared_ptrINS2_6futureIDTclfp_EEEEEERKT_+00000071[ 75] 0x00007fd13e347bc8 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmvm.so+03439560 _ZNSt17_Function_handlerIFN7mwboost3anyEvEZN14cmddistributor15PackagedTaskIIP10createFuncINS0_8functionIFvvEEEEESt8functionIS2_ET_EUlvE_E9_M_invokeERKSt9_Any_data+00000024[ 76] 0x00007fd12eae9e3b /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+01019451 _ZN3iqm18PackagedTaskPlugin7executeEP15inWorkSpace_tag+00000091[ 77] 0x00007fd12eac7716 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00878358[ 78] 0x00007fd12ea918b2 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00657586[ 79] 0x00007fd12ea9267d /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00661117[ 80] 0x00007fd12ea92994 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwiqm.so+00661908[ 81] 0x00007fd12e94bd07 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmcr.so+00769287[ 82] 0x00007fd12e94c3ce /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmcr.so+00771022[ 83] 0x00007fd12e94c69d /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwmcr.so+00771741[ 84] 0x00007fd13ea0db17 /opt/hostedtoolcache/MATLAB/2025.1.999/x64/bin/glnxa64/libmwboost_thread.so.1.81.0+00043799[ 85] 0x00007fd13f09caa4 /lib/x86_64-linux-gnu/libc.so.6+00641700[ 86] 0x00007fd13f129c3c /lib/x86_64-linux-gnu/libc.so.6+01219644This error was detected while a MEX-file was running. If the MEX-fileis not an official MathWorks function, please examine its source codefor errors. Please consult the External Interfaces Guide for informationon debugging MEX-files.MATLAB is exiting because of fatal errorexit status 255

[Steven Lord]

Can you attach the crash log file you receive to your original post, or include it as a comment?

[Zaikun Zhang]

Thank you, Steven. I have updated the question to include the log. See also https://github.com/zequipe/test_matlab/blob/master/segfault_2025a/README.md

Answer 1

[Zaikun Zhang]

This issue is due to increased security measures on Linux machines. Starting in R2025a, the execstack flag of the MATLAB executable will not be enabled, since having the execstack flag enabled poses a security risk. Because of this change, any MEX function, or one of it's dependencies, that requires an executable stack will cause MATLAB to crash. Similarly, any external language (C, C++, Java, Python, Fortran), or one of it's dependencies, that requires an executable stack will also cause MATLAB to crash. To resolve these crashes, see the workaround steps in Why does my Fortran MEX file with internal subroutines crash on Linux with MATLAB R2025a. The workaround steps in this article are not specific to this Fortran issue and can be applied generally if the crash is caused by the execstack flag of the MATLAB executable not being enabled.