[Bug libgomp/63193] New: omp_set_dynamic memory leak

["thomas.huxhorn at web dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63193

            Bug ID: 63193
           Summary: omp_set_dynamic  memory leak
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thomas.huxhorn at web dot de
                CC: jakub at gcc dot gnu.org

Created attachment 33454
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33454&action=edit
preprocessed file

small memory leak found with valgrind.
60b are still reachable with gcc 4.7.2 and 104b with 4.9.1.


kater@ktux:~$ gcc -v -save-temps -Wall -Wextra -fopenmp omp_set_dynamic_leak.c
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i586-linux-gnu/4.9/lto-wrapper
Target: i586-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.1-12'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-i386/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-i386
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-i386
--with-arch-directory=i386 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-targets=all --enable-multiarch --with-arch-32=i586
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=i586-linux-gnu --host=i586-linux-gnu
--target=i586-linux-gnu
Thread model: posix
gcc version 4.9.1 (Debian 4.9.1-12)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-fopenmp'
'-mtune=generic' '-march=i586' '-pthread'
 /usr/lib/gcc/i586-linux-gnu/4.9/cc1 -E -quiet -v -imultiarch i386-linux-gnu
-D_REENTRANT omp_set_dynamic_leak.c -mtune=generic -march=i586 -Wall -Wextra
-fopenmp -fpch-preprocess -o omp_set_dynamic_leak.i
ignoring nonexistent directory "/usr/local/include/i386-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i586-linux-gnu/4.9/../../../../i586-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i586-linux-gnu/4.9/include
 /usr/local/include
 /usr/lib/gcc/i586-linux-gnu/4.9/include-fixed
 /usr/include/i386-linux-gnu
 /usr/include

End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-fopenmp'
'-mtune=generic' '-march=i586' '-pthread'
 /usr/lib/gcc/i586-linux-gnu/4.9/cc1 -fpreprocessed omp_set_dynamic_leak.i
-quiet -dumpbase omp_set_dynamic_leak.c -mtune=generic -march=i586 -auxbase
omp_set_dynamic_leak -Wall -Wextra -version -fopenmp -o omp_set_dynamic_leak.s
GNU C (Debian 4.9.1-12) version 4.9.1 (i586-linux-gnu)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C (Debian 4.9.1-12) version 4.9.1 (i586-linux-gnu)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 35aa769f5ca4f1c8bba3ec1739207cbd
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-fopenmp'
'-mtune=generic' '-march=i586' '-pthread'
 as -v --32 -o omp_set_dynamic_leak.o omp_set_dynamic_leak.s
GNU assembler version 2.24.51 (i586-linux-gnu) using BFD version (GNU Binutils
for Debian) 2.24.51.20140818
COMPILER_PATH=/usr/lib/gcc/i586-linux-gnu/4.9/:/usr/lib/gcc/i586-linux-gnu/4.9/:/usr/lib/gcc/i586-linux-gnu/:/usr/lib/gcc/i586-linux-gnu/4.9/:/usr/lib/gcc/i586-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/i586-linux-gnu/4.9/:/usr/lib/gcc/i586-linux-gnu/4.9/../../../i386-linux-gnu/:/usr/lib/gcc/i586-linux-gnu/4.9/../../../../lib/:/lib/i386-linux-gnu/:/lib/../lib/:/usr/lib/i386-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/i586-linux-gnu/4.9/../../../:/lib/:/usr/lib/
Reading specs from /usr/lib/gcc/i586-linux-gnu/4.9/libgomp.spec
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-fopenmp'
'-mtune=generic' '-march=i586' '-pthread'
 /usr/lib/gcc/i586-linux-gnu/4.9/collect2 -plugin
/usr/lib/gcc/i586-linux-gnu/4.9/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/i586-linux-gnu/4.9/lto-wrapper
-plugin-opt=-fresolution=omp_set_dynamic_leak.res
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lpthread -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --sysroot=/
--build-id --eh-frame-hdr -m elf_i386 --hash-style=gnu -dynamic-linker
/lib/ld-linux.so.2
/usr/lib/gcc/i586-linux-gnu/4.9/../../../i386-linux-gnu/crt1.o
/usr/lib/gcc/i586-linux-gnu/4.9/../../../i386-linux-gnu/crti.o
/usr/lib/gcc/i586-linux-gnu/4.9/crtbegin.o -L/usr/lib/gcc/i586-linux-gnu/4.9
-L/usr/lib/gcc/i586-linux-gnu/4.9/../../../i386-linux-gnu
-L/usr/lib/gcc/i586-linux-gnu/4.9/../../../../lib -L/lib/i386-linux-gnu
-L/lib/../lib -L/usr/lib/i386-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/i586-linux-gnu/4.9/../../.. omp_set_dynamic_leak.o -lgomp -lgcc
--as-needed -lgcc_s --no-as-needed -lpthread -lc -lgcc --as-needed -lgcc_s
--no-as-needed /usr/lib/gcc/i586-linux-gnu/4.9/crtend.o
/usr/lib/gcc/i586-linux-gnu/4.9/../../../i386-linux-gnu/crtn.o

kater@ktux:~$ valgrind  --leak-check=full --show-reachable=yes   ./a.out
==6006== Memcheck, a memory error detector
==6006== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==6006== Using Valgrind-3.9.0 and LibVEX; rerun with -h for copyright info
==6006== Command: ./a.out
==6006==
==6006==
==6006== HEAP SUMMARY:
==6006==     in use at exit: 104 bytes in 2 blocks
==6006==   total heap usage: 3 allocs, 1 frees, 32,900 bytes allocated
==6006==
==6006== 4 bytes in 1 blocks are still reachable in loss record 1 of 2
==6006==    at 0x4028B4C: malloc (vg_replace_malloc.c:291)
==6006==    by 0x4055A59: gomp_malloc (alloc.c:36)
==6006==    by 0x405FB6E: gomp_init_num_threads (proc.c:90)
==6006==    by 0x4053FFD: initialize_env (env.c:1187)
==6006==    by 0x400E86D: call_init.part.0 (dl-init.c:78)
==6006==    by 0x400E963: _dl_init (dl-init.c:36)
==6006==    by 0x4000D3E: ??? (in /lib/i386-linux-gnu/ld-2.19.so)
==6006==
==6006== 100 bytes in 1 blocks are still reachable in loss record 2 of 2
==6006==    at 0x4028B4C: malloc (vg_replace_malloc.c:291)
==6006==    by 0x4055A59: gomp_malloc (alloc.c:36)
==6006==    by 0x405EEB6: gomp_new_icv (team.c:942)
==6006==    by 0x4055D64: omp_set_dynamic (libgomp.h:498)
==6006==    by 0x80484E5: main (in /home/kater/a.out)
==6006==
==6006== LEAK SUMMARY:
==6006==    definitely lost: 0 bytes in 0 blocks
==6006==    indirectly lost: 0 bytes in 0 blocks
==6006==      possibly lost: 0 bytes in 0 blocks
==6006==    still reachable: 104 bytes in 2 blocks
==6006==         suppressed: 0 bytes in 0 blocks
==6006==
==6006== For counts of detected and suppressed errors, rerun with: -v
==6006== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)