[Libevent-users] Libevent memory leak?

[Andrei Chirila]

Hello,

I'm using libevent in some programs and I came across a memory leak in
libevent. I'm wondering if I'm the one doing something wrong or it's really
something in libevent.

Valgrind reports:

achirila@virtual-machine:~/src/tests$ valgrind --leak-check=full
--show-reachable=yes ./test_event.exe
==18888== Memcheck, a memory error detector
==18888== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==18888== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for
copyright info
==18888== Command: ./test_event.exe
==18888==
==18888==
==18888== HEAP SUMMARY:
==18888==     in use at exit: 80 bytes in 2 blocks
==18888==   total heap usage: 40 allocs, 38 frees, 4,350 bytes allocated
==18888==
==18888== 40 bytes in 1 blocks are still reachable in loss record 1 of 2
==18888==    at 0x4C2815C: malloc (vg_replace_malloc.c:236)
==18888==    by 0x4D1759: evthread_posix_lock_alloc (evthread_pthread.c:48)
==18888==    by 0x4C8341: evsig_init (signal.c:174)
==18888==    by 0x4C7AD2: epoll_init (epoll.c:142)
==18888==    by 0x4B9184: event_base_new_with_config (event.c:601)
==18888==    by 0x4B92A4: event_base_new (event.c:439)
==18888==    by 0x404181: main (test_event.c:11)
==18888==
==18888== 40 bytes in 1 blocks are still reachable in loss record 2 of 2
==18888==    at 0x4C2815C: malloc (vg_replace_malloc.c:236)
==18888==    by 0x4D1759: evthread_posix_lock_alloc (evthread_pthread.c:48)
==18888==    by 0x4D1361: evutil_secure_rng_init (evutil_rand.c:102)
==18888==    by 0x4D09EE: evdns_base_new (evdns.c:3756)
==18888==    by 0x404196: main (test_event.c:12)
==18888==
==18888== LEAK SUMMARY:
==18888==    definitely lost: 0 bytes in 0 blocks
==18888==    indirectly lost: 0 bytes in 0 blocks
==18888==      possibly lost: 0 bytes in 0 blocks
==18888==    still reachable: 80 bytes in 2 blocks
==18888==         suppressed: 0 bytes in 0 blocks
==18888==
==18888== For counts of detected and suppressed errors, rerun with: -v
==18888== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)

Test program:

#include <stdlib.h>
#include <event2/event.h>
#include <event2/dns.h>

int main() {
    if(evthread_use_pthreads() < 0) {
        fprintf(stderr, "Could not enable pthreads support in libevent\n");
        exit(1);
    }

    struct event_base *ebp = event_base_new();
    struct evdns_base *dns = evdns_base_new(ebp, 1);
    evdns_base_free(dns, 1);
    event_base_free(ebp);
    return 0;
}

Thank you,
Andrei Chirila

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