https://bugs.llvm.org/show_bug.cgi?id=32580
Bug ID: 32580
Summary: libFuzzer: Output diff of last mutation prior to
writing out crash/oom/slow-unit test case
Product: new-bugs
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
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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