From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-480425-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 78429 invoked by alias); 16 Mar 2015 11:03:30 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 77693 invoked by uid 48); 16 Mar 2015 11:03:20 -0000
From: "mitya57 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/65434] New: Memory leak in pool constructor
Date: Mon, 16 Mar 2015 11:03:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 5.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: mitya57 at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-65434-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2015-03/txt/msg01569.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65434

            Bug ID: 65434
           Summary: Memory leak in pool constructor
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mitya57 at gmail dot com

Constructor of `pool' class in eh_alloc.c has the following code:

pool::pool()
  {
    // Allocate the arena - we could add a GLIBCXX_EH_ARENA_SIZE environment
    // to make this tunable.
    arena_size = (EMERGENCY_OBJ_SIZE * EMERGENCY_OBJ_COUNT
                  + EMERGENCY_OBJ_COUNT * sizeof (__cxa_dependent_exception));
    arena = (char *)malloc (arena_size);
    ....
  }

The memory allocated by `malloc (arena_size)' is never freed, because that
class does not have a destructor. This results in a memory leak. Valgrind
reports:

18,944 bytes in 1 blocks are still reachable in loss record 1 of 1
   at 0x40291CC: malloc (vg_replace_malloc.c:296)
   by 0x40D630A: pool (eh_alloc.cc:117)
   by 0x40D630A: __static_initialization_and_destruction_0 (eh_alloc.cc:244)
   by 0x40D630A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:307)
   by 0x400E86D: call_init.part.0 (dl-init.c:78)
   by 0x400E963: call_init (dl-init.c:36)
   by 0x400E963: _dl_init (dl-init.c:126)
   by 0x4000D3E: ??? (in /lib/i386-linux-gnu/ld-2.19.so)

This happens with the current gcc-5 snapshot, but did not happen with 4.9.

It was broken in revision 219988 (PR libstdc++/64535).