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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Deadlock in llvm-lit on windows 7"
href="http://llvm.org/bugs/show_bug.cgi?id=22335">22335</a>
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<th>Summary</th>
<td>Deadlock in llvm-lit on windows 7
</td>
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<th>Product</th>
<td>Test Suite
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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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>P
</td>
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<th>Component</th>
<td>lit
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sgundapa@codeaurora.org
</td>
</tr>
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<th>CC</th>
<td>daniel@zuster.org, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I am observing a deadlock with llvm-lit on windows 7.
When I attached a debugger, the communicate() call is blocked.
In file utils/lit/lit/TestRunner.py
<span class="quote">> # FIXME: There is probably still deadlock potential here. Yawn.
> procData = [None] * len(procs)
> procData[-1] = procs[-1].communicate()</span >
I am invoking python directly on windows to run the unit tests.
C:\Python27\python.exe C:\build\llvm\Release\bin\llvm-lit.py -v -j 12 --param
build_mode=Release --param build_config=Win32
llvm_site_config=C:\llvm_on_win\nightly\build\llvm\tools\polly\test\lit.site.cfg
test
Note: If I invoke with “-j 1” , the unit tests finish but took a lot of time.
There is no deadlock. I am using python version 2.7.6.
At this moment, I believe the issue is caused by stdout filling the OS buffer
there by blocking the communicate() call.
It is possible some of the unit tests dump a lot of text/data to stdout. FYI, I
have a couple of unit tests of my own in the code base.
On Linux, there is no deadlock but on windows I am hitting a deadlock 7 out of
10 times. I tried invoking python with “-u” but in vain.
When I looked at llvm-lit code, I saw the code to avoid deadlocks but there was
no guarantee, like the one I pasted above.
Would appreciate if some one take a look at it and provide more context on
deadlocks.</pre>
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