[llvm-bugs] [Bug 32580] New: libFuzzer: Output diff of last mutation prior to writing out crash/oom/slow-unit test case
llvm-bugs at lists.llvm.org
Sat Apr 8 09:14:41 PDT 2017
Bug ID: 32580
Summary: libFuzzer: Output diff of last mutation prior to
writing out crash/oom/slow-unit test case
Component: new bugs
Assignee: unassignedbugs at nondot.org
Reporter: ddkilzer at kilzer.net
CC: kcc at google.com, llvm-bugs at lists.llvm.org
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.
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