https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70058
Bug ID: 70058 Summary: Segmentation fault when open file with existing file and status = "UNKNOWN" Product: gcc Version: 5.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: ranftmaps at hotmail dot com Target Milestone: --- For the Windows 64 bit gfortran version 5.1.0, a segmentation fault will occur if the open statement with status = 'UNKNOWN' is used when the file exists. Earlier versions of gfortran (such as 4.6.2) do not have this issue. Example code is as follows: OPEN(UNIT=5,FILE='exists.txt',STATUS='UNKNOWN') CLOSE(UNIT=5,STATUS='KEEP') STOP 'NORMAL TERMINATION' END gfortran version information is as follows: C:\TDM-GCC-64\bin>gfortran -v Using built-in specs. COLLECT_GCC=gfortran COLLECT_LTO_WRAPPER=C:/TDM-GCC-64/bin/../libexec/gcc/x86_64-w64-mingw32/5.1.0/lto-wrapper.exe Target: x86_64-w64-mingw32 Configured with: ../../../src/gcc-5.1.0/configure --build=x86_64-w64-mingw32 --enable-targets=all --enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ --enable-libgomp --enable-lto --enable-graphite --enable-cxx-flags=-DWINPTHREAD_STATIC --disable-build-with-cxx --disable-build-poststage1-with-cxx --enable-libstdcxx-debug --enable-threads=posix --enable-version-specific-runtime-libs --enable-fully-dynamic-string --enable-libstdcxx-threads --enable-libstdcxx-time --with-gnu-ld --disable-werror --disable-nls --disable-win32-registry --prefix=/mingw64tdm --with-local-prefix=/mingw64tdm --with-pkgversion=tdm64-1 --with-bugurl=http://tdm-gcc.tdragon.net/bugs Thread model: posix gcc version 5.1.0 (tdm64-1)