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Bug 2493

Summary: Memory leak on simplest possible example
Product: SDL Reporter: jightuse
Component: *don't know*Assignee: Ryan C. Gordon <icculus>
Status: RESOLVED DUPLICATE QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.2   
Hardware: x86_64   
OS: Linux   
Attachments: minimal_example.c

Description jightuse 2014-04-12 08:44:24 UTC 
Created attachment 1617 [details]
minimal_example.c

I tried to found memory leaks in my project which uses SDL2 and C++11.
See this SO question https://stackoverflow.com/questions/23027862/memory-leak-on-object-destruction and this forum thread http://forums.libsdl.org/viewtopic.php?p=42979&sid=8cf1d6c83d4d73fe6cfbb7cbb16b3d28 (I have created an account on it but I "have no rights" to post something).

Some investigation shows that this minimal example (see attachment) triggers valgrind warnings:
$ valgrind --leak-check=full ./a.out                
==30569== Memcheck, a memory error detector
==30569== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==30569== Using Valgrind-3.9.0 and LibVEX; rerun with -h for copyright info
==30569== Command: ./a.out
==30569== 
==30569== 
==30569== HEAP SUMMARY:
==30569==     in use at exit: 76,368 bytes in 516 blocks
==30569==   total heap usage: 19,676 allocs, 19,160 frees, 44,888,606 bytes allocated
==30569== 
==30569== 12 bytes in 2 blocks are definitely lost in loss record 5 of 100
==30569==    at 0x4C274A0: malloc (vg_replace_malloc.c:291)
==30569==    by 0x51B5829: strdup (strdup.c:42)
==30569==    by 0x6195666: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==30569==    by 0x6196474: _XimSetICValueData (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==30569==    by 0x6191A69: _XimLocalCreateIC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==30569==    by 0x6178044: XCreateIC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==30569==    by 0x4EEBCD2: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4EEC0F7: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4EDF5FF: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4EDF40F: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4E4A48E: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4006BA: main (dog.c:4)
==30569== 
==30569== 104 bytes in 1 blocks are definitely lost in loss record 58 of 100
==30569==    at 0x4C274A0: malloc (vg_replace_malloc.c:291)
==30569==    by 0xBC79A11: ??? (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==30569==    by 0xBC52600: ??? (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==30569==    by 0xBC4EE7A: ??? (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==30569==    by 0xBC4F60F: glXChooseVisual (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==30569==    by 0x4EE8D0E: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4EE8F40: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4EDDB65: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4EDF6FB: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4EDF40F: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4E4A48E: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==30569==    by 0x4006BA: main (dog.c:4)
==30569== 
==30569== LEAK SUMMARY:
==30569==    definitely lost: 116 bytes in 3 blocks
==30569==    indirectly lost: 0 bytes in 0 blocks
==30569==      possibly lost: 0 bytes in 0 blocks
==30569==    still reachable: 76,252 bytes in 513 blocks
==30569==         suppressed: 0 bytes in 0 blocks
==30569== Reachable blocks (those to which a pointer was found) are not shown.
==30569== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==30569== 
==30569== For counts of detected and suppressed errors, rerun with: -v
==30569== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 6 from 3)
Comment 1 jightuse 2014-04-14 10:18:28 UTC 
Stack trace with dbg packages installed:
$ valgrind --leak-check=full ./a.out
==11828== Memcheck, a memory error detector
==11828== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==11828== Using Valgrind-3.9.0 and LibVEX; rerun with -h for copyright info
==11828== Command: ./a.out
==11828== 

==11828== 
==11828== HEAP SUMMARY:
==11828==     in use at exit: 76,368 bytes in 516 blocks
==11828==   total heap usage: 19,239 allocs, 18,723 frees, 44,848,319 bytes allocated
==11828== 
==11828== 12 bytes in 2 blocks are definitely lost in loss record 5 of 100
==11828==    at 0x4C274A0: malloc (vg_replace_malloc.c:291)
==11828==    by 0x51B5829: strdup (strdup.c:42)
==11828==    by 0x6195666: _XimEncodeString (imRm.c:818)
==11828==    by 0x6196474: _XimSetICValueData (imRm.c:2912)
==11828==    by 0x6191A69: _XimLocalCreateIC (imLcIc.c:176)
==11828==    by 0x6178044: XCreateIC (ICWrap.c:247)
==11828==    by 0x4EEBCD2: SetupWindowData (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4EEC0F7: X11_CreateWindow (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4EDF5FF: SDL_CreateWindow_REAL (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4EDF40F: SDL_VideoInit_REAL (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4E4A48E: SDL_InitSubSystem_REAL (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4006BA: main (minimal_example.c:4)
==11828== 
==11828== 104 bytes in 1 blocks are definitely lost in loss record 58 of 100
==11828==    at 0x4C274A0: malloc (vg_replace_malloc.c:291)
==11828==    by 0xBC79A11: ??? (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==11828==    by 0xBC52600: ??? (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==11828==    by 0xBC4EE7A: ??? (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==11828==    by 0xBC4F60F: glXChooseVisual (in /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2.0)
==11828==    by 0x4EE8D0E: X11_GL_GetVisual (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4EE8F40: X11_GL_LoadLibrary (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4EDDB65: SDL_GL_LoadLibrary_REAL (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4EDF6FB: SDL_CreateWindow_REAL (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4EDF40F: SDL_VideoInit_REAL (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4E4A48E: SDL_InitSubSystem_REAL (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.2.0)
==11828==    by 0x4006BA: main (minimal_example.c:4)
==11828== 
==11828== LEAK SUMMARY:
==11828==    definitely lost: 116 bytes in 3 blocks
==11828==    indirectly lost: 0 bytes in 0 blocks
==11828==      possibly lost: 0 bytes in 0 blocks
==11828==    still reachable: 76,252 bytes in 513 blocks
==11828==         suppressed: 0 bytes in 0 blocks
==11828== Reachable blocks (those to which a pointer was found) are not shown.
==11828== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==11828== 
==11828== For counts of detected and suppressed errors, rerun with: -v
==11828== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 6 from 3)
Comment 2 Sam Lantinga 2014-04-18 03:55:07 UTC 
This is a duplicate of bug 2086

*** This bug has been marked as a duplicate of bug 2086 ***