<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </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 - std::shuffle freeze up"
   href="https://bugs.llvm.org/show_bug.cgi?id=45373">45373</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>std::shuffle freeze up
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

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

        <tr>
          <th>Hardware</th>
          <td>Macintosh
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>MacOS X
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>release blocker
          </td>
        </tr>

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

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

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

        <tr>
          <th>Reporter</th>
          <td>sdanie@protonmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=23297" name="attach_23297" title="C++ source file showcasing the problem.">attachment 23297</a> <a href="attachment.cgi?id=23297&action=edit" title="C++ source file showcasing the problem.">[details]</a></span>
C++ source file showcasing the problem.

Using std::shuffle with a generator that yields the same value for all calls
causes std::shuffle to freeze up. I attached a C++ source file showcasing the
problem.

Replicates on:
Apple clang version 11.0.0 (clang-1100.0.33.12)
Target: x86_64-apple-darwin19.3.0
Thread model: posix

Replication:
clang++ -o bug.exe -std=c++17 bug.cpp && ./bug.exe

The application will freeze when trying to shuffle the elements.
The application will no longer freeze if the 17th element is removed from
samples.</pre>
        </div>
      </p>


      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>