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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - infinite loop (?) in -simplifycfg"
href="https://llvm.org/bugs/show_bug.cgi?id=30292">30292</a>
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<th>Summary</th>
<td>infinite loop (?) in -simplifycfg
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>willdtz@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17215" name="attach_17215" title="bitcode demonstrating bug, from libevent">attachment 17215</a> <a href="attachment.cgi?id=17215&action=edit" title="bitcode demonstrating bug, from libevent">[details]</a></span>
bitcode demonstrating bug, from libevent
Encountered this starting about a week ago on trunk, occurred when building
libevent.
With the attached bc file:
$ opt event.bc -simplifycfg -disable-output -debug-pass=Executions
...
[2016-09-06 09:38:06.956737000] 0x3838f10 Executing Pass 'Simplify the CFG'
on Function 'event_base_loop'...
And it proceeds to never complete this pass (hours+).
I'm not sure what the best way to reduce a timing-related bug is, apologies for
the non-reduced test-case. Even getting this bitcode was more trouble than I
expected (tips welcome, is there a better way?): I ended up using
-print-before=simplifycfg and kludging the function printing pass to dump the
entire module instead.
LMK if you have any questions or problems reproducing on trunk, thanks!</pre>
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