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    <head>
      <base href="http://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Race conditions in Mach-O driver file parsing.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lld
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>devlists@shadowlab.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <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>
        </div>
      </p>
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