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Subject: [Bug libgomp/49613] New: Error with OpenMP / gomp and gcc detected by valgrind
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49613

           Summary: Error with OpenMP / gomp and gcc detected by valgrind
           Product: gcc
           Version: 4.5.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgomp
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: cx-Tech@web.de


Created attachment 24658
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24658
Code, makefile and result log.

Hey,
I've got a error when compiling

#include <stdio.h>


int main()

{
int i,max=100;

double r[max];



#pragma omp parallel private(i) shared(r)

{

#pragma omp for schedule(static,2) nowait

for(i=0;i<max;i++)

    r[i]=i*max;

}
return 1;

}

with

gcc -O0 -g -Wall -Wextra -pedantic -std=c99 -fopenmp -o test test.c

The .c file, makefile and a logfile is included in this report. Running
valgrind I get the following output

valgrind --leak-check=full --show-reachable=yes --track-origins=yes ./test

==2078== Memcheck, a memory error detector
==2078== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==2078== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for
copyright info
==2078== Command: ./test
==2078== 
==2078== 
==2078== HEAP SUMMARY:
==2078==     in use at exit: 1,756 bytes in 4 blocks
==2078==   total heap usage: 4 allocs, 0 frees, 1,756 bytes allocated
==2078== 
==2078== 12 bytes in 1 blocks are still reachable in loss record 1 of 4
==2078==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==2078==    by 0x4025C5D: realloc (vg_replace_malloc.c:525)
==2078==    by 0x406AC58: gomp_realloc (alloc.c:54)
==2078==    by 0x40707CB: gomp_team_start (team.c:360)
==2078==    by 0x406F29D: GOMP_parallel_start (parallel.c:108)
==2078==    by 0x804857C: main (test.c:9)
==2078== 
==2078== 144 bytes in 1 blocks are possibly lost in loss record 2 of 4
==2078==    at 0x4024F12: calloc (vg_replace_malloc.c:467)
==2078==    by 0x40117CB: _dl_allocate_tls (dl-tls.c:300)
==2078==    by 0x407A6A9: pthread_create@@GLIBC_2.1 (allocatestack.c:570)
==2078==    by 0x40705DB: gomp_team_start (team.c:422)
==2078==    by 0x406F29D: GOMP_parallel_start (parallel.c:108)
==2078==    by 0x804857C: main (test.c:9)
==2078== 
==2078== 192 bytes in 1 blocks are still reachable in loss record 3 of 4
==2078==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==2078==    by 0x406ABB1: gomp_malloc (alloc.c:36)
==2078==    by 0x407080E: gomp_team_start (team.c:191)
==2078==    by 0x406F29D: GOMP_parallel_start (parallel.c:108)
==2078==    by 0x804857C: main (test.c:9)
==2078== 
==2078== 1,408 bytes in 1 blocks are still reachable in loss record 4 of 4
==2078==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==2078==    by 0x406ABB1: gomp_malloc (alloc.c:36)
==2078==    by 0x40702D8: gomp_new_team (team.c:144)
==2078==    by 0x406F283: GOMP_parallel_start (parallel.c:108)
==2078==    by 0x804857C: main (test.c:9)
==2078== 
==2078== LEAK SUMMARY:
==2078==    definitely lost: 0 bytes in 0 blocks
==2078==    indirectly lost: 0 bytes in 0 blocks
==2078==      possibly lost: 144 bytes in 1 blocks
==2078==    still reachable: 1,612 bytes in 3 blocks
==2078==         suppressed: 0 bytes in 0 blocks
==2078== 
==2078== For counts of detected and suppressed errors, rerun with: -v
==2078== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 21 from 8)

I've tested this also on an Intel CPU and get the same result.