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Test flake in ASan: asan_lsan_deadlock.cpp #140646

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@ilovepi

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@ilovepi

We're seeing the asan_lsan_deadlock.cpp test flake with some regularity. The initial bug report can be found here: https://issuetracker.google.com/411742482, but this is still showing up in our CI fairly regularly. https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci/clang-linux-x64/b8714404311534072321/overview. Failures seem to have been happening intermittently since April.

@vitalybuka @fmayer Do either of you have an idea of what may be going wrong? I'm guessing the deadlock test just isn't deterministic in all cases. The bot in question is just building a toolchain for Linux x86_64.

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