I noticed this running mixed mpi/openmp on a system that required an executable
without dynamics libraries. Don't know if the Fortran IO is supposed to be
thread safe (i.e. serialized thread safe), but this seems to work without
-static. It also appears to work with 4.3.1 but not 4.4 (trunk)
> cat test.f90
!$OMP PARALLEL
!$OMP CRITICAL
write(6,*) "Hello world"
!$OMP END CRITICAL
!$OMP END PARALLEL
write(6,*) "Done!"
END
> gfortran -static -fopenmp test.f90
> ./a.out
Segmentation fault
> gdb ./a.out
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This GDB was configured as "x86_64-suse-linux"...Using host libthread_db
library "/lib64/libthread_db.so.1".
(gdb) run
Starting program: /data/vondele/omptest/a.out
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0 0x0000000000000000 in ?? ()
#1 0x000000000040642f in get_external_unit (n=6, do_create=1)
at /data/vondele/gcc_trunk/gcc/libgfortran/../gcc/gthr-posix.h:704
#2 0x0000000000404c01 in data_transfer_init (dtp=0x7fff047208c0, read_flag=0)
at /data/vondele/gcc_trunk/gcc/libgfortran/io/transfer.c:1828
#3 0x00000000004003d6 in MAIN__.omp_fn.0 ()
#4 0x000000000040032c in MAIN__ ()
#5 0x000000000040042c in main (argc=1, argv=0x7fff04720fa8)
at /data/vondele/gcc_trunk/gcc/libgfortran/fmain.c:21
(gdb)
--
Summary: [4.4 Regression] -static and -fopenmp and io causes
segfault
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: libfortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jv244 at cam dot ac dot uk
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39176
