https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61187
Bug ID: 61187
Summary: valgrind errors if stdin is closed
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
Reporter: jb at gcc dot gnu.org
In some cases STDIN_FILENO (0 in POSIX) can be closed. This happens e.g. for
rank != 0 MPI processes with MPICH2. This results in valgrind complaining about
uninitialized variables.
Test program:
! Compile and run with
! gfortran -g otest.f90
! mpirun -np 2 valgrind --track-origins=yes a.out
program otest
implicit none
print *, "hello"
end program
Running via mpirun from mvapich2 1.8 and gcc 4.9.0 and strace shows:
fstat(0, fstat(0, 0x7ffff4ee09d0) = -1 EBADF (Bad file
descriptor)
In unix.c(fd_to_stream) we don't check the return value of fstat before
accessing statbuf.
See https://gcc.gnu.org/ml/fortran/2014-04/msg00081.html for original bug
report.
