Valgrind report on multithreaded GraphBLAS

a_valgrind.log

==7502== Memcheck, a memory error detector
==7502== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==7502== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==7502== Command: ./possible_leak
==7502== 
==7502== 
==7502== HEAP SUMMARY:
==7502==     in use at exit: 5,680 bytes in 12 blocks
==7502==   total heap usage: 27 allocs, 15 frees, 3,487,337 bytes allocated
==7502== 
==7502== 8 bytes in 1 blocks are still reachable in loss record 1 of 6
==7502==    at 0x4C2FDB3: malloc (vg_replace_malloc.c:309)
==7502==    by 0x51E3A98: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51F2A56: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51E206A: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x4010732: call_init (dl-init.c:72)
==7502==    by 0x4010732: _dl_init (dl-init.c:119)
==7502==    by 0x40010C9: ??? (in /lib/x86_64-linux-gnu/ld-2.27.so)
==7502== 
==7502== 72 bytes in 1 blocks are still reachable in loss record 2 of 6
==7502==    at 0x4C2FCF4: malloc (vg_replace_malloc.c:308)
==7502==    by 0x4C32243: realloc (vg_replace_malloc.c:836)
==7502==    by 0x51E3AE8: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51F180E: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51E7EC9: GOMP_parallel (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x12B4D0: GB_nthreads (GB.h:920)
==7502==    by 0x12B4D0: GB_resize (GB_resize.c:54)
==7502==    by 0x12A330: GxB_Matrix_resize (GxB_Matrix_resize.c:31)
==7502==    by 0x127082: main (possible_leak.c:19)
==7502== 
==7502== 192 bytes in 1 blocks are still reachable in loss record 3 of 6
==7502==    at 0x4C2FDB3: malloc (vg_replace_malloc.c:309)
==7502==    by 0x51E3A98: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51F0B45: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51E7EB5: GOMP_parallel (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x12B4D0: GB_nthreads (GB.h:920)
==7502==    by 0x12B4D0: GB_resize (GB_resize.c:54)
==7502==    by 0x12A330: GxB_Matrix_resize (GxB_Matrix_resize.c:31)
==7502==    by 0x127082: main (possible_leak.c:19)
==7502== 
==7502== 208 bytes in 1 blocks are still reachable in loss record 4 of 6
==7502==    at 0x4C2FDB3: malloc (vg_replace_malloc.c:309)
==7502==    by 0x51E3A98: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51F1FFA: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51E3FDC: omp_set_nested (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x12AC3E: GB_init (GB_init.c:119)
==7502==    by 0x129F2F: GrB_init (GrB_init.c:33)
==7502==    by 0x126FF8: main (possible_leak.c:9)
==7502== 
==7502== 2,128 bytes in 7 blocks are possibly lost in loss record 5 of 6
==7502==    at 0x4C32002: calloc (vg_replace_malloc.c:762)
==7502==    by 0x40134A6: allocate_dtv (dl-tls.c:286)
==7502==    by 0x40134A6: _dl_allocate_tls (dl-tls.c:530)
==7502==    by 0x5A06227: allocate_stack (allocatestack.c:627)
==7502==    by 0x5A06227: pthread_create@@GLIBC_2.2.5 (pthread_create.c:644)
==7502==    by 0x51F0F31: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51E7EC9: GOMP_parallel (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x12B4D0: GB_nthreads (GB.h:920)
==7502==    by 0x12B4D0: GB_resize (GB_resize.c:54)
==7502==    by 0x12A330: GxB_Matrix_resize (GxB_Matrix_resize.c:31)
==7502==    by 0x127082: main (possible_leak.c:19)
==7502== 
==7502== 3,072 bytes in 1 blocks are still reachable in loss record 6 of 6
==7502==    at 0x4C2FDB3: malloc (vg_replace_malloc.c:309)
==7502==    by 0x51E3A98: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51F09C7: ??? (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x51E7EB5: GOMP_parallel (in /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0)
==7502==    by 0x12B4D0: GB_nthreads (GB.h:920)
==7502==    by 0x12B4D0: GB_resize (GB_resize.c:54)
==7502==    by 0x12A330: GxB_Matrix_resize (GxB_Matrix_resize.c:31)
==7502==    by 0x127082: main (possible_leak.c:19)
==7502== 
==7502== LEAK SUMMARY:
==7502==    definitely lost: 0 bytes in 0 blocks
==7502==    indirectly lost: 0 bytes in 0 blocks
==7502==      possibly lost: 2,128 bytes in 7 blocks
==7502==    still reachable: 3,552 bytes in 5 blocks
==7502==         suppressed: 0 bytes in 0 blocks
==7502== 
==7502== For lists of detected and suppressed errors, rerun with: -s
==7502== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)

Makefile

CFLAGS = -D_GNU_SOURCE -std=gnu99 -fopenmp -g

GRAPHBLAS=../deps/GraphBLAS/build/libgraphblas.a

all:
	$(CC) $(CFLAGS) -o possible_leak possible_leak.c $(GRAPHBLAS) -lpthread -lm

clean:
	rm possible_leak

possible_leak.c

#include <stdlib.h>
#include <assert.h>
#include "../deps/GraphBLAS/Include/GraphBLAS.h"
#include "../src/util/rmalloc.h"

#define DIMENSIONS 100000

int main() {
	assert(GrB_init(GrB_NONBLOCKING) == GrB_SUCCESS);
	GxB_set(GxB_FORMAT, GxB_BY_ROW); // all matrices in CSR format
	GxB_set(GxB_HYPER, GxB_NEVER_HYPER); // matrices are never hypersparse

	// Construct new matrix with default size
	GrB_Matrix Adjacency;
	GrB_Matrix_new(&Adjacency, GrB_BOOL, 16384, 16384);

	// Resize to capacity on creation
	GrB_Index new_cap = 114688; // computed matrix size during creation
	assert(GxB_Matrix_resize(Adjacency, new_cap, new_cap) == GrB_SUCCESS);

	GrB_Index nvals;
	assert(GrB_Matrix_nvals(&nvals, Adjacency) == GrB_SUCCESS);

	assert(GxB_Matrix_resize(Adjacency, DIMENSIONS, DIMENSIONS) == GrB_SUCCESS);

	GrB_Matrix_free(&Adjacency);
	GrB_finalize();
	return 0;
}

Run with:
valgrind --leak-check=full --show-leak-kinds=all ./possible_leak