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 |  | 
 | <h3 class="section">30.1 Have You Found a Bug?</h3> | 
 |  | 
 | <p><a name="index-bug-criteria-2176"></a> | 
 | If you are not sure whether you have found a bug, here are some guidelines: | 
 |  | 
 |       | 
 | <a name="index-fatal-signal-2177"></a> | 
 | <a name="index-debugger-crash-2178"></a> | 
 | <a name="index-crash-of-debugger-2179"></a> | 
 | <ul><li>If the debugger gets a fatal signal, for any input whatever, that is a | 
 | <span class="sc">gdb</span> bug.  Reliable debuggers never crash. | 
 |  | 
 |      <p><a name="index-error-on-valid-input-2180"></a><li>If <span class="sc">gdb</span> produces an error message for valid input, that is a | 
 | bug.  (Note that if you're cross debugging, the problem may also be | 
 | somewhere in the connection to the target.) | 
 |  | 
 |      <p><a name="index-invalid-input-2181"></a><li>If <span class="sc">gdb</span> does not produce an error message for invalid input, | 
 | that is a bug.  However, you should note that your idea of | 
 | “invalid input” might be our idea of “an extension” or “support | 
 | for traditional practice”. | 
 |  | 
 |      <li>If you are an experienced user of debugging tools, your suggestions | 
 | for improvement of <span class="sc">gdb</span> are welcome in any case.  | 
 | </ul> | 
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