fuzz: oss-fuzz coverage build is failing

fanquake commented at 1:33 pm on January 31, 2025: member

It first failed on the 25th (https://oss-fuzz-build-logs.storage.googleapis.com/log-7da28be4-dcf5-4e23-a6ca-153f67ad2f60.txt):

 0Step [#7](/bitcoin-bitcoin/7/): [0m[0;31mwarning: The file '/usr/evmap.c' isn't covered.
 1Step [#7](/bitcoin-bitcoin/7/): [0m[0;31merror: /workspace/out/libfuzzer-coverage-x86_64/usr/arc4random.c: No such file or directory
 2Step [#7](/bitcoin-bitcoin/7/): [0m[0;31mwarning: The file '/usr/arc4random.c' isn't covered.
 3Step [#7](/bitcoin-bitcoin/7/): [0m[0;31merror: /workspace/out/libfuzzer-coverage-x86_64/usr/buffer.c: No such file or directory
 4Step [#7](/bitcoin-bitcoin/7/): [0m[0;31mwarning: The file '/usr/buffer.c' isn't covered.
 5Step [#7](/bitcoin-bitcoin/7/): [0m[0;31merror: /workspace/out/libfuzzer-coverage-x86_64/usr/util-internal.h: No such file or directory
 6Step [#7](/bitcoin-bitcoin/7/): [0m[0;31mwarning: The file '/usr/util-internal.h' isn't covered.
 7Step [#7](/bitcoin-bitcoin/7/): [0m[2025-01-31 07:01:44,276 DEBUG] Finished generating per-file code coverage summary.
 8Step [#7](/bitcoin-bitcoin/7/): [2025-01-31 07:01:44,277 DEBUG] Generating file view html index file as: "/workspace/out/libfuzzer-coverage-x86_64/report/linux/file_view_index.html".
 9Step [#7](/bitcoin-bitcoin/7/): Traceback (most recent call last):
10Step [#7](/bitcoin-bitcoin/7/):   File "/opt/code_coverage/coverage_utils.py", line 829, in <module>
11Step [#7](/bitcoin-bitcoin/7/):     sys.exit(Main())
12Step [#7](/bitcoin-bitcoin/7/):   File "/opt/code_coverage/coverage_utils.py", line 823, in Main
13Step [#7](/bitcoin-bitcoin/7/):     return _CmdPostProcess(args)
14Step [#7](/bitcoin-bitcoin/7/):   File "/opt/code_coverage/coverage_utils.py", line 780, in _CmdPostProcess
15Step [#7](/bitcoin-bitcoin/7/):     processor.PrepareHtmlReport()
16Step [#7](/bitcoin-bitcoin/7/):   File "/opt/code_coverage/coverage_utils.py", line 577, in PrepareHtmlReport
17Step [#7](/bitcoin-bitcoin/7/):     self.GenerateFileViewHtmlIndexFile(per_file_coverage_summary,
18Step [#7](/bitcoin-bitcoin/7/):   File "/opt/code_coverage/coverage_utils.py", line 450, in GenerateFileViewHtmlIndexFile
19Step [#7](/bitcoin-bitcoin/7/):     self.GetCoverageHtmlReportPathForFile(file_path),
20Step [#7](/bitcoin-bitcoin/7/):   File "/opt/code_coverage/coverage_utils.py", line 422, in GetCoverageHtmlReportPathForFile
21Step [#7](/bitcoin-bitcoin/7/):     assert os.path.isfile(
22Step [#7](/bitcoin-bitcoin/7/): AssertionError: "/usr/arc4random.c" is not a file.
23Step [#7](/bitcoin-bitcoin/7/): ********************************************************************************
24Step [#7](/bitcoin-bitcoin/7/): Code coverage report generation failed.
25Step [#7](/bitcoin-bitcoin/7/): To reproduce, run:
26Step [#7](/bitcoin-bitcoin/7/): python infra/helper.py build_image bitcoin-core
27Step [#7](/bitcoin-bitcoin/7/): python infra/helper.py build_fuzzers --sanitizer coverage bitcoin-core
28Step [#7](/bitcoin-bitcoin/7/): python infra/helper.py coverage bitcoin-core
29Step [#7](/bitcoin-bitcoin/7/): ********************************************************************************
30Finished Step [#7](/bitcoin-bitcoin/7/)
31ERROR
32ERROR: build step 7 "gcr.io/oss-fuzz-base/base-runner" failed: step exited with non-zero status: 1

davidgumberg commented at 3:30 am on February 1, 2025: contributor

Bisected to https://github.com/bitcoin/bitcoin/commit/5691fa93c48c5b2c767f19aad5e972e4d760414a (#31661),

Can reproduce doing something like:

 0# setup 
 1git clone --depth 1 https://github.com/google/oss-fuzz.git
 2git clone https://github.com/bitcoin/bitcoin oss-fuzz/bitcoin
 3git clone --depth 1 https://github.com/bitcoin-core/qa-assets oss-fuzz/bitcoin/assets
 4cd oss-fuzz
 5python infra/helper.py build_image bitcoin-core
 6
 7# check out a commit hash for the local copy
 8BAD_COMMIT=5691fa93c4
 9GOOD_COMMIT=8fc7140846
10cd bitcoin && git checkout $BAD_COMMIT && cd ..
11
12python infra/helper.py build_fuzzers --sanitizer coverage bitcoin-core bitcoin/
13python infra/helper.py coverage bitcoin-core --fuzz-target psbt

Probably related to using -ffile-prefix-map (https://github.com/bitcoin/bitcoin/pull/31661#discussion_r1923896475)

fanquake added this to the milestone 29.0 on Feb 1, 2025

hebasto commented at 2:57 pm on February 5, 2025: member

A fix has been proposed in #31800.

fanquake closed this on Feb 7, 2025

fanquake referenced this in commit 81eb6cc2c6 on Feb 7, 2025

bitcoin locked this on Feb 7, 2026

fuzz: oss-fuzz coverage build is failing #31770