[llvm-bugs] [Bug 43226] New: libfuzzer: Document REDUCE event outputs

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43226

            Bug ID: 43226
           Summary: libfuzzer: Document REDUCE event outputs
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: fuzzer
          Assignee: unassignedbugs at nondot.org
          Reporter: chfast at gmail.com
                CC: llvm-bugs at lists.llvm.org

There are some information missing from the libfuzzer documentation about the
"L:" and "REDUCE" event. See https://llvm.org/docs/LibFuzzer.html#output
section.

1. The example is outdated.
2. The "L:" column now has 2 values (e.g. "L: 17214/25000"). I'm guessing the
second one is the length limit, but this is also provided in the "lim:" column?
3. The REDUCE event also outputs "L:" and "MS:" values, but this is
undocumented. I would especially want to know that "L:" means in case of
REDUCE.
4. The REDUCE sometimes adds a new file to corpus (the file count increases).
Can you document why is this happening?

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