It seems there is no

moi_c_ · ‎09-29-2015

Hi,

We are using intel inspector XE 2016 on a game made on Unreal Engine 4 to find memory leaks. However it seems to report a lot of false-positive pairs of "missing allocation" and "memory leak". We suppose that all allocations in one thread but free'd in another thread are causing such false positive reports. Is there a solution/option to tell intel inspector that such reports are linked? We can't find our real memory leak as we are flooded in a lot of those reports.

Thanks.

Peter_W_Intel · ‎10-11-2015

It seems there is no additional (necessary) option to inform Inspector to avoid false-positive report between threads, e.g. memory leaks, if you try to allocate memory in one thread and free it in other thread, Inspector reported there is no problem found. Here is a simplest test case.

^{#include <stdio.h>

#include <stdlib.h>

#include <pthread.h>

#include <unistd.h>}

^{define NUM_THREADS 2}

^{char *g_s20=NULL;}

^{void * funcA(void* args)

{

char *s20;}

^{s20=(char *)malloc(20); // use s20 in this function

if (s20) g_s20=s20;}

^{// printf("g_s20 = %lx\n", g_s20);}

^}

^{void * funcB(void* args)

{

if (g_s20) free(g_s20);

}}

^{int main()

{

int i;

pthread_t h[NUM_THREADS];}

^{pthread_create(&h[0], 0, funcA, NULL);

sleep(3); // ensure that funcA runs first.

pthread_create(&h[1], 0, funcB, NULL);}

^{for (i = 0; i < NUM_THREADS; ++i)

pthread_join (h, 0);}

^{return 0;

}}

$icc -g threads_2.cpp -o threads_2 -lpthread

$inspxe-cl -c mi3 ./threads_2

0 new problem(s) found

Cross thread heap allocation/deallocation