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    <head>
      <base href="https://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 --- - libFuzzer shouldn't disable default mutators when a custom one is defined"
   href="https://llvm.org/bugs/show_bug.cgi?id=31583">31583</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>libFuzzer shouldn't disable default mutators when a custom one is defined
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </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>new bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ttaubert@mozilla.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Currently, libFuzzer disables all default mutators and only the custom mutator,
if one is defined. We're currently applying the patch below to get the default
ones back when building against libFuzzer:

<span class="quote">> diff --git libFuzzer/FuzzerMutate.cpp libFuzzer/FuzzerMutate.cpp
> --- libFuzzer/FuzzerMutate.cpp
> +++ libFuzzer/FuzzerMutate.cpp
> @@ -52,10 +52,9 @@
>      DefaultMutators.push_back(
>          {&MutationDispatcher::Mutate_AddWordFromTORC, "CMP"});

> +  Mutators = DefaultMutators;
>    if (EF->LLVMFuzzerCustomMutator)
>      Mutators.push_back({&MutationDispatcher::Mutate_Custom, "Custom"});
> -  else
> -    Mutators = DefaultMutators;

>    if (EF->LLVMFuzzerCustomCrossOver)
>      Mutators.push_back(</span ></pre>
        </div>
      </p>
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