Bug 109641 - GLX swrast driver leaks shared memory segments
Summary: GLX swrast driver leaks shared memory segments
Status: RESOLVED FIXED
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Gallium/llvmpipe (show other bugs)
Version: 18.0
Hardware: All Linux (All)
: medium normal
Assignee: mesa-dev
QA Contact: mesa-dev
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Reported: 2019-02-15 15:26 UTC by Marcello Blancasio
Modified: 2019-03-13 03:12 UTC (History)
0 users

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Description Marcello Blancasio 2019-02-15 15:26:58 UTC 
Using Gnome 3.28 (CentOS 7.6) with llvmpipe driver, Mesa 18.0, but same problem exists with Gnome 3.30 (Ubuntu 18.10), Mesa 18.2.

Opened a Gnome Terminal window.

New shared memory segments are created every time the terminal window is resized (found it with: ipcs -m | wc -l).

It looks XShmAttach() is called in src/glx/drisw_glx.c:XCreateDrawable(), but XShmDetach() is never called. Should it be called in XDestroyDrawable()?
Comment 1 Brian Paul 2019-03-12 01:27:48 UTC 
I believe this recent patch should help:

commit b344e32cdf7064a1f2ff7ef37027edda6589404f
Author: Ray Zhang <zhanglei002@gmail.com>
Date:   Wed Feb 27 06:54:05 2019 +0000

    glx: fix shared memory leak in X11
    
    call XShmDetach to allow X server to free shared memory
    
    Fixes: bcd80be49a8260c2233d "drisw/glx: use XShm if possible"
    Signed-off-by: Ray Zhang <zhanglei002@gmail.com>
    Reviewed-by: Dave Airlie <airlied@redhat.com>


Can you try top-of-tree Mesa?
Comment 2 Brian Paul 2019-03-12 01:37:58 UTC 
And it appears this patch will be in the Mesa 19.0 release.
Comment 3 Marcello Blancasio 2019-03-12 14:45:56 UTC 
The patch fixed the issue. Thank you.

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