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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - libFuzzer: Output diff of last mutation prior to writing out crash/oom/slow-unit test case"
href="https://bugs.llvm.org/show_bug.cgi?id=32580">32580</a>
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<th>Summary</th>
<td>libFuzzer: Output diff of last mutation prior to writing out crash/oom/slow-unit test case
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>ddkilzer@kilzer.net
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<th>CC</th>
<td>kcc@google.com, llvm-bugs@lists.llvm.org
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<pre>When working on fixing test cases found by libFuzzer, I realized it would be
really useful if the last mutation (which may have caused the
crash/oom/slow-unit issue) was written out with the test case itself.
For large test files (especially for bugs in parsers), this could be very
useful when both investigating the bug via debugger and when manually creating
a reduced test case.
I think writing out the N-1 test case (so the user can use whatever comparison
tools that they have available) would be more useful than trying to provide a
'diff' or some kind of patch format.</pre>
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