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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - xcb_wait_for_reply makes valgrind report memory leaks on Mesa driver"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105237">105237</a>
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<th>Summary</th>
<td>xcb_wait_for_reply makes valgrind report memory leaks on Mesa driver
</td>
</tr>
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<th>Product</th>
<td>XCB
</td>
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<th>Version</th>
<td>1.11
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>critical
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Library
</td>
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<th>Assignee</th>
<td>xcb@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>94389147@qq.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>xcb@lists.freedesktop.org
</td>
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<pre>Hi all,
I used valgrind to test my app's memory leak on ubuntu 16.04/amd64. In the
report, it gives me following callstacks about leaking.
==3307== 324 bytes in 9 blocks are definitely lost in loss record 704 of 901
==3307== at 0x4C2DB8F: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==3307== by 0xC23314B: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==3307== by 0xC230ED0: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==3307== by 0xC232616: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==3307== by 0xC232720: xcb_wait_for_reply (in
/usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==3307== by 0xFFE21F1: dri3_update_drawable.isra.9
(loader_dri3_helper.c:1205)
==3307== by 0xFFE361C: loader_dri3_get_buffers (loader_dri3_helper.c:1556)
==3307== by 0x11CAC63C: intel_update_image_buffers (brw_context.c:1707)
==3307== by 0x11CAC63C: intel_update_renderbuffers (brw_context.c:1383)
==3307== by 0x11CACB10: intel_prepare_render (brw_context.c:1404)
==3307== by 0x11CACBD2: intelMakeCurrent (brw_context.c:1242)
==3307== by 0x11C6C9B5: driBindContext (dri_util.c:585)
==3307== by 0xFFDDC95: dri3_bind_context (dri3_glx.c:199)
It seems the xcb_wait_for_reply calling caused the memory leak on my machine. I
delved into direct caller function in loader_dri3_helper.c:1205.
It's as following,
.....
1203 geom_cookie = xcb_get_geometry(draw->conn, draw->drawable);
1204
1205 geom_reply = xcb_get_geometry_reply(draw->conn, geom_cookie, NULL);
1206
1207 if (!geom_reply) {
1208 mtx_unlock(&draw->mtx);
1209 return false;
1210 }
1211
1212 draw->width = geom_reply->width;
1213 draw->height = geom_reply->height;
1214 draw->depth = geom_reply->depth;
1215 draw->vtable->set_drawable_size(draw, draw->width, draw->height);
1216
1217 free(geom_reply);
....
These is a free(geom_reply) to release resource in 1217 line. And I don't know
why valgrind doesn't count the free calling. It seems
xcb_get_geometry_reply/xcb_wait_for_reply not really reply and hanging there?
Jiancong</pre>
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