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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Race conditions in Mach-O driver file parsing."
href="http://llvm.org/bugs/show_bug.cgi?id=21806">21806</a>
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<th>Summary</th>
<td>Race conditions in Mach-O driver file parsing.
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>devlists@shadowlab.org
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>lld Driver parse InputElement concurrently using a TaskGroup.
Unfortunately, the InputElement parse() implementations are not thread safe.
Especially all access to the LinkerContext should be protected by a mutex.
For instance, when parsing Mach-O file using MachOFileNode::parse(), the parse
function call MachOLinkingContext::addInputFileDependency and
MachOLinkingContext::registerDylib which are not thread-safe.
I got a bunch of random crash when the context try to access the _allDylibs
member after parsing and that member was corrupted by a concurrent access
during parsing.</pre>
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