[Bug 26708] New: libdrm-intel leaks memory when resizing window

[bugzilla-daemon@freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26708

           Summary: libdrm-intel leaks memory when resizing window
           Product: DRI
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libdrm
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: penma.bfdo@penma.de


At least the DRM/Intel module continues to suck up memory just by resizing the
window. This would be acceptable behaviour if it wouldn't continue to grow on
and on, as it happens for software rendering.

This can not only be reproduced with a (potentially buggy) selfwritten test
program but also with the glxdemo.c program from Mesa.

To reproduce, start the test program and make the window smaller, and larger,
and smaller again quite wildly and often (10-30 seconds or so).

What happens if you start it with LIBGL_ALWAYS_SOFTWARE=1: Memory usage goes up
to about 10M and stays there.

What happens if you start it without that option set (DRM/Intel): Memory usage
continues to grow with every resize operation even when the window size is only
changed around 100x100 +-5px.

Excerpt from Valgrind output (it had lots of those):

 ==11088== 3,244,032 bytes in 99 blocks are still reachable in loss record 331
of 331
 ==11088==    at 0x4C221A7: malloc (vg_replace_malloc.c:195)
 ==11088==    by 0x7B3A822: ??? (in /usr/lib/libdrm_intel.so.1.0.0)
 ==11088==    by 0x74B2344: ??? (in /usr/lib/dri/i965_dri.so)
 ==11088==    by 0x74B41AD: brw_validate_state (in /usr/lib/dri/i965_dri.so)
 ==11088==    by 0x74A6DBD: brw_draw_prims (in /usr/lib/dri/i965_dri.so)
 ==11088==    by 0x75641A4: vbo_exec_vtx_flush (in /usr/lib/dri/i965_dri.so)
 ==11088==    by 0x7560154: vbo_exec_FlushVertices_internal (in
/usr/lib/dri/i965_dri.so)
 ==11088==    by 0x7560221: vbo_exec_FlushVertices (in
/usr/lib/dri/i965_dri.so)
 ==11088==    by 0x74DB15D: _mesa_Flush (in /usr/lib/dri/i965_dri.so)
 ==11088==    by 0x4E4C2B1: glXSwapBuffers (in /usr/lib/libGL.so.1.2)

One test run got 23 MiB of still accessible memory all from libdrm. I don't
think it's used for anything useful, if not because of the size, then because
of the fact the software renderer does not leak.


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