This test mode tries to create threads wherever it legally can to
maximize the chances of TSAN finding errors in our codebase.
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This maybe used to quickly verify the code coverage of a modified test
locally (e.g. fuzzer).
Example:
```
# Build and run target; the raw profile will be written to $LLVM_PROFILE_FILE when the program exits
$ bazel build --config=dbg --config=fuzzer_asan --config=coverage //test/core/end2end/fuzzers:api_fuzzer
$ LLVM_PROFILE_FILE="api_fuzzer.profraw" bazel-bin/test/core/end2end/fuzzers/api_fuzzer test/core/end2end/fuzzers/api_fuzzer_corpus/*
# Create coverage report
$ llvm-profdata-14 merge -sparse api_fuzzer.profraw -o api_fuzzer.profdata
$ llvm-cov-14 report ./bazel-bin/test/core/end2end/fuzzers/api_fuzzer --instr-profile=api_fuzzer.profdata
```
Sample report:
f94e444f25/gistfile1.txt
One trick is that the binary needs to be statically linked, e.g. specify
`linkstatic = 1` on the BUILD target.
See https://clang.llvm.org/docs/SourceBasedCodeCoverage.html for more
info.
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Initial PR to establish a bazel dependency on
https://github.com/google/fuzztest, with which I'm planning on basing a
hardening program.
Casting a relatively wide net with reviewers: I'm genuinely interested
in feedback building up the docs, and general ergonomics of this change.
I've located relevant files in the `fuzztest/...` directory. The tests
only build with the `--config fuzztest` bazel argument for now (because
of needing C++17), so locating them separately keeps `bazel test
test/...` working as it does today. In a few years time, when we adopt
C++17, we'll be able to rationalize the test directories a little bit.
We'll need to add some kokoro jobs (maybe with this PR?) to execute the
relevant tests.
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With the `--copt="-std=c++14"` setting in the bazel.rc file as it is
today, MSVC builds have complained for every cc file:
```
cl : Command line warning D9002 : ignoring unknown option '-std=c++14'
```
This adds thousands of lines of noise to Windows builds, and hides
useful warnings. Using the `/std:c++14` flag on MSVC (and clang-cl) gets
us the desired result.
* WIP. A seemingly properly failing test
* WIP. Pre-fork handlers now work
* Roughly working.
* Clean up
* Clean up more
* Add to CI
* Format
* Ugh. Remove swap file
* And another
* clean up
* Add copyright
* Format
* Remove another debug line
* Add stub forkable methods
* Remove use of 3.9+ function
* Remove unintentional double copyright
* drfloob review comments
* Only hold lock during Close once
* Create separate job for fork test
* Bump up gdb timeout
* Format
* [cleanup] Remove profiling timers
- nobody has used this system in years
- if we needed it, we'd probably rewrite it at this point to be something more modern
- let's remove it until that need arises
* fix
* fixes
Craig Tiller
Yijie Ma
Esun Kim
AJ Heller
Richard Belleville
Craig Tiller
Lidi Zheng
Jan Tattermusch
Nicolas Noble
Prashant Jaikumar
Nicolas "Pixel" Noble
Eric Gribkoff