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Merge bitcoin/bitcoin#32245: doc: Updates how to reproduce fuzz CI failure locally
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8fe001d597 doc: Updates how to reproduce fuzz CI failure locally (Sergi Delgado Segura)

Pull request description:

  The current version of the doc does not explain how to reproduce a recent fuzzing CI failure (not yet part of the corpora). Add instructions on how to manually create a crash file based on a report.

ACKs for top commit:
  maflcko:
    lgtm ACK 8fe001d597
  glozow:
    ACK 8fe001d597

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@ -136,6 +136,13 @@ Patience is useful; even with improved throughput, libFuzzer may need days and
- run the fuzzer with the case number appended to the seed corpus path: - run the fuzzer with the case number appended to the seed corpus path:
`FUZZ=process_message build_fuzz/bin/fuzz `FUZZ=process_message build_fuzz/bin/fuzz
qa-assets/fuzz_corpora/process_message/1bc91feec9fc00b107d97dc225a9f2cdaa078eb6` qa-assets/fuzz_corpora/process_message/1bc91feec9fc00b107d97dc225a9f2cdaa078eb6`
- If the file does not exist, make sure you are checking out the exact same commit id
for the qa-assets repo. If the file was found while running the fuzz engine in the CI,
you should be able to reproduce the crash locally with the same (or a similar input)
within a few minutes. Alternatively, you can use the base64 encoded file from the CI log,
if it exists. e.g.
`echo "Nb6Fc/97AACAAAD/ewAAgAAAAIAAAACAAAAAoA==" |
base64 --decode > qa-assets/fuzz_corpora/process_message/1bc91feec9fc00b107d97dc225a9f2cdaa078eb6`
## Submit improved coverage ## Submit improved coverage