Initial corpora for feefrac, build_and_compare_feerate_diagram, and package_rbf #179

1. 
   marcofleon commented at 0:49 am on April 5, 2024: contributor

   I noticed there was no corpus for three harnesses that recently got added, so I created some initial inputs.

   I followed the same process for each one outlined in the most recent open pull request. Started with inputs from the other directories. FUZZ=package_rbf src/test/fuzz/fuzz -set_cover_merge=1 -shuffle=0 -prefer_small=1 -use_value_profile=0 ../qa-assets/fuzz_seed_corpus/package_rbf ../qa-assets/fuzz_seed_corpus/*

   Then came up with inputs from scratch (let that run for a bit). FUZZ=package_rbf src/test/fuzz/fuzz -jobs=4 -prefer_small=1 ../qa-assets/fuzz_seed_corpus/package_rbf_new

   Then merged those two directories to get the final corpus. FUZZ=package_rbf src/test/fuzz/fuzz -set_cover_merge=1 -shuffle=0 -prefer_small=1 -use_value_profile=0 ../qa-assets/fuzz_seed_corpus/package_rbf ../qa-assets/fuzz_seed_corpus/package_rbf_new

   Here is the coverage summary:

   0python3 ./test/fuzz/test_runner.py ../qa-assets/fuzz_seed_corpus feefrac build_and_compare_feerate_diagram package_rbf
   13 of 177 detected fuzz target(s) selected: build_and_compare_feerate_diagram feefrac package_rbf
   2Summary:
   3build_and_compare_feerate_diagram [#54](/bitcoin-core-qa-assets/54/)	DONE   cov: 145 ft: 746 corp: 53/1099Kb lim: 1048551 exec/s: 0 rss: 38Mb
   4feefrac                           [#28](/bitcoin-core-qa-assets/28/)	DONE   cov: 113 ft: 113 corp: 27/571b lim: 129 exec/s: 0 rss: 33Mb
   5package_rbf                       [#434](/bitcoin-core-qa-assets/434/)	DONE   cov: 1818 ft: 9496 corp: 420/26Mb lim: 1048576 exec/s: 434 rss: 253Mb
   

2. add package_rbf feefrac and build_and_compare_feerate_diagram corpora f47a2b7d17
3. 
   murchandamus commented at 2:10 am on April 5, 2024: contributor

   Awesome, thanks for working on this, will take a more thorough look tomorrow.
4. maflcko approved
5. 
   maflcko commented at 6:15 am on April 5, 2024: contributor

   lgtm. Thanks
6. murchandamus approved
7. 
   murchandamus commented at 12:46 pm on April 5, 2024: contributor

   Ran them locally and tried fuzzing a bit on them. Looks great, build_and_compare_feerate_diagram and feefrac I only found reductions with a bit of fuzzing even. Thanks!
8. dergoegge merged this on Apr 5, 2024
9. dergoegge closed this on Apr 5, 2024

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Contributors
marcofleon murchandamus maflcko