[Mesa-dev] Possible memory leak with `glxMakeCurrent`?

[Miklós Máté]

On 08/18/2016 05:08 AM, Michel Dänzer wrote:
> On 18/08/16 05:39 AM, Itai wrote:
>> (Posted initially in mesa-users, but got no reply - the list seems dead.
>> Couldn't find any bug report, and sadly not well versed enough in mesa
>> to file one myself).
> FWIW, there's no need to be versed in Mesa to file a bug report. :)
>
>
>> Following an investigation of a memory leak with JavaFX on some Linux
>> configuration, it looks like there is a possible memory leak when using
>> `glxMakeCurrent`.
>> Sadly, I myself don't know enough about OpenGL/Mesa to describe it
>> fully, but I'm hoping someone here can understand it well enough to make
>> a proper bug report.
>>
>> Here is a link to the discussion on the openjfx-dex list:
>> http://mail.openjdk.java.net/pipermail/openjfx-dev/2016-August/019577.html
>>
>> Here is a forum post describing a non-Java way to reproduce this same
>> issue:
>> http://www.gamedev.net/topic/679705-glxmakecurrent-slowly-leaks-memory/
>>
>>
>> This was possibly not an issue in older versions of Mesa, as the bug
>> does not appear on older Linux installations (I'm using Mesa 11.2.2,
>> where the bug is present)
> Does it still happen with current Git master? There have been some fixes
> in this area recently.
>
> If it still happens, the output of running an affected application in
> valgrind --leak-check=full (with debugging symbols available for at
> least all Mesa binaries) would be useful.
>
>
I can confirm that there is a per-makecurrent leak in 11.2, but it seems 
to be fixed in 12.0.

==28934== 1,673,408 bytes in 9,508 blocks are definitely lost in loss 
record 692 of 692
==28934==    at 0x402F218: calloc (vg_replace_malloc.c:711)
==28934==    by 0x525B981: r600_create_surface_custom (r600_texture.c:1202)
==28934==    by 0x525BC6B: r600_create_surface (r600_texture.c:1248)
==28934==    by 0x4ED2A37: st_framebuffer_validate (st_manager.c:235)
==28934==    by 0x4ED3F1D: st_api_make_current (st_manager.c:783)
==28934==    by 0x4FB38EA: dri_make_current (dri_context.c:245)
==28934==    by 0x4FB268E: driBindContext (dri_util.c:553)
==28934==    by 0x4078ABD: dri2_bind_context (dri2_glx.c:160)
==28934==    by 0x4050955: MakeContextCurrent (glxcurrent.c:228)
==28934==    by 0x4050AF5: glXMakeCurrent (glxcurrent.c:262)
==28934==    by 0x8049210: display (makecurrent.c:92)
==28934==    by 0x418451B: ??? (in /usr/lib/i386-linux-gnu/libglut.so.3.9.0)

MM