Issue Details

Number

23366

Title

CI failure: `ThreadSanitizer: data race /usr/lib/llvm-12/bin/../include/c++/v1/ios:523:12 in std::__1::ios_base::width() const`

Description

I'm seeing this race failure in two unrelated PRs during the `validation_chainstate_tests/chainstate_update_tip` case: https://cirrus-ci.com/task/5125235994263552?logs=ci#L4140 from #22702 https://cirrus-ci.com/task/5269464468946944?logs=ci#L4142 from #21206 ``` test/validation_chainstate_tests.cpp(83): Entering test case "chainstate_update_tip" ... [Makefile:18480: test/validation_chainstate_tests.cpp.test] Error 1 ... WARNING: ThreadSanitizer: data race (pid=23076) Read of size 8 at 0x7f23d669c6d0 by main thread: #0 std::__1::ios_base::width() const /usr/lib/llvm-12/bin/../include/c++/v1/ios:523:12 (test_bitcoin+0x17826c) ... Location is global 'std::__1::cout' of size 160 at 0x7f23d669c6b0 (libc++.so.1+0x0000000cd6d0) ... SUMMARY: ThreadSanitizer: data race /usr/lib/llvm-12/bin/../include/c++/v1/ios:523:12 in std::__1::ios_base::width() const ``` I'm not sure if this is a real bug or spurious, but I did work around a similar problem previously (in #15719) by adding a suppression: https://github.com/bitcoin/bitcoin/blob/81be7ff5215eb2f21ca7bc73e565c13215dda7bb/test/sanitizer_suppressions/tsan#L33-L40

URL

https://github.com/bitcoin/bitcoin/issue/23366

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