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Uploading a testcase

You may have a testcase that you want to run against your latest production build and check if it crashes. ClusterFuzz provides the Upload Testcase page for this purpose. The Upload Testcase page can run binaries with a testcase and give details about the crash, such as, the crash stacktrace, when the crash was introduced, etc.


Upload new testcase

To upload a new testcase:

  1. Click the “UPLOAD” button.
  2. Archive your testcase locally.
    1. If your testcase is a single file, you can upload as-is.
    2. If your testcase consists of multiple files:
      • The main file that is passed to the app must contain run in its name (e.g. run.html).
      • Bundle all the files in an archive. Supported archive formats include zip and tar.
      • Exception: If you want to test multiple testcases at once, you don’t need to rename them. Just bundle them in an archive, and select the Test every file in archive independently checkbox in the form.
  3. Click the “Choose File” button and provide the testcase archive in the file chooser dialog.
  4. Select a Job. This provides information of which build or application to run this testcase against.
  5. If you selected a fuzzing engine job in last step (e.g. libFuzzer, AFL), you would need to provide the name of the fuzz target to use. This is required as an application build can contain multiple fuzz target binaries.
  6. Provide values for any of the other optional fields in the form. Examples:
    1. You can provide a Commit Position/Revision to run it against a particular revision. This is usually used to check a crash against an older version of the application.
    2. If you want your testcase to be served from a http server, you can check the Load testcase from HTTP server. checkbox.
  7. Click the “CREATE” button.

Check status

Once you upload a new testcase, you will be redirected to the Testcase Details page for that testcase. This page auto-refreshes every 5 minutes to provide the latest results. At first, ClusterFuzz tries to find if the testcase results in a crash or not. If it does not, ClusterFuzz sets the status of the testcase as Unreproducible. If the testcase does crash, then ClusterFuzz starts with first updating the crash parameters in the *Overview** section and crash stacktrace in the Crash Stacktrace section. Then, ClusterFuzz tries the other tasks such as testcase minimization, finding the regression range, etc.

Please be patient to wait on the results. The speed of the results will depend on the availability of bot(s).