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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 - glXSwapBuffers() can cause BadMatch or lock X when performed repeatedly"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88354">88354</a>
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<th>Summary</th>
<td>glXSwapBuffers() can cause BadMatch or lock X when performed repeatedly
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>10.4
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>GLX
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>leftmostcat@gmail.com
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=112152" name="attach_112152" title="Test program demonstrating crash/lock">attachment 112152</a> <a href="attachment.cgi?id=112152&action=edit" title="Test program demonstrating crash/lock">[details]</a></span>
Test program demonstrating crash/lock
When running a simple program to test window and GL context creation, I
experience program crashes or X lockups when the main loop calls
glXSwapBuffers() too rapidly. When the swap interval is not set, this appears
to always cause X to lock, with only the mouse responding. (n.b. When
attempting to drag windows, the cursor changes appropriately but the windows do
not respond.) If glXSwapIntervalMESA(1) is called, this occasionally merely
results in a program crash after some number of loops. In both cases, the
following error appears in the output and the program stops execution:
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 147 ()
Minor opcode of failed request: 1
Serial number of failed request: 163
Current serial number in output stream: 1034
After the end of execution, if X is locked, it remains locked until restarted.
Putting a one second delay into the main loop prevents the crash and programs
using GLX while rendering real results have not yet elicited any crashes,
suggesting this is a race condition somewhere. The test program I am using to
reproduce this is attached.
I am using mesa 10.4.1 with the i965 drivers on an Intel HD 3000 with kernel
3.17.8. All packages are from the Fedora 21 repositories.</pre>
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