grpc/core at 6a742f0c2ec77b8ed0db4002f3cf58fa01c1ff5d - grpc

The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/

Craig Tiller 4674f2ccf7 [fuzz] Turn core end2end tests into fuzzers (#33013 ) Add a new binary that runs all core end2end tests in fuzzing mode. In this mode FuzzingEventEngine is substituted for the default event engine. This means that time is simulated, as is IO. The FEE gets control of callback delays also. In our tests the `Step()` function becomes, instead of a single call to `completion_queue_next`, a series of calls to that function and `FuzzingEventEngine::Tick`, driving forward the event loop until progress can be made. PR guide: --- New binaries `core_end2end_test_fuzzer` - the new fuzzer itself `seed_end2end_corpus` - a tool that produces an interesting seed corpus Config changes for safe fuzzing The implementation tries to use the config fuzzing work we've previously deployed in api_fuzzer to fuzz across experiments. Since some experiments are far too experimental to be safe in such fuzzing (and this will always be the case): - a new flag is added to experiments to opt-out of this fuzzing - a new hook is added to the config system to allow variables to re-write their inputs before setting them during the fuzz Event manager/IO changes Changes are made to the event engine shims so that tcp_server_posix can run with a non-FD carrying EventEngine. These are in my mind a bit clunky, but they work and they're in code that we expect to delete in the medium term, so I think overall the approach is good. Changes to time A small tweak is made to fix a bug initializing time for fuzzers in time.cc - we were previously failing to initialize `g_process_epoch_cycles` Changes to `Crash` A version that prints to stdio is added so that we can reliably print a crash from the fuzzer. Changes to CqVerifier Hooks are added to allow the top level loop to hook the verification functions with a function that steps time between CQ polls. Changes to end2end fixtures State machinery moves from the fixture to the test infra, to keep the customizations for fuzzing or not in one place. This means that fixtures are now just client/server factories, which is overall nice. It did necessitate moving some bespoke machinery into h2_ssl_cert_test.cc - this file is beginning to be problematic in borrowing parts but not all of the e2e test machinery. Some future PR needs to solve this. A cq arg is added to the Make functions since the cq is now owned by the test and not the fixture. Changes to test registration `TEST_P` is replaced by `CORE_END2END_TEST` and our own test registry is used as a first depot for test information. The gtest version of these tests: queries that registry to manually register tests with gtest. This ultimately changes the name of our tests again (I think for the last time) - the new names are shorter and more readable, so I don't count this as a regression. The fuzzer version of these tests: constructs a database of fuzzable tests that it can consult to look up a particular suite/test/config combination specified by the fuzzer to fuzz against. This gives us a single fuzzer that can test all 3k-ish fuzzing ready tests and cross polinate configuration between them. Changes to test config The zero size registry stuff was causing some problems with the event engine feature macros, so instead I've removed those and used GTEST_SKIP in the problematic tests. I think that's the approach we move towards in the future. Which tests are included Configs that are compatible - those that do not do fd manipulation directly (these are incompatible with FuzzingEventEngine), and those that do not join threads on their shutdown path (as these are incompatible with our cq wait methodology). Each we can talk about in the future - fd manipulation would be a significant expansion of FuzzingEventEngine, and is probably not worth it, however many uses of background threads now should probably evolve to be EventEngine::Run calls in the future, and then would be trivially enabled in the fuzzers. Some tests currently fail in the fuzzing environment, a `SKIP_IF_FUZZING` macro is used for these few to disable them if in the fuzzing environment. We'll burn these down in the future. Changes to fuzzing_event_engine Changes are made to time: an exponential sweep forward is used now - this catches small time precision things early, but makes decade long timers (we have them) able to be used right now. In the future we'll just skip time forward to the next scheduled timer, but that approach doesn't yet work due to legacy timer system interactions. Changes to port assignment: we ensure that ports are legal numbers before assigning them via `grpc_pick_port_or_die`. A race condition between time checking and io is fixed. --------- Co-authored-by: ctiller <ctiller@users.noreply.github.com>		2 years ago
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BUILD	Move some targets from //: to //src/core: (#31402 )	2 years ago
gen_config_vars.py	[fuzz] Turn core end2end tests into fuzzers (#33013 )	2 years ago
gen_experiments.py	[fuzz] Turn core end2end tests into fuzzers (#33013 )	2 years ago
gen_grpc_tls_credentials_options.py	Fix include guards for src/ and test/ directories (#32167 )	2 years ago
gen_header_frame.py	[chttp2] Fix some fuzzer found bugs. (#33005 )	2 years ago
gen_huffman_decompressor.cc	[chttp2] Improve huffman decoder bloat (#31633 )	2 years ago
gen_server_registered_method_bad_client_test_body.py	Migrate Infrastructure Scripts to Python 3 (#27135 )	3 years ago
gen_settings_ids.py	A http2 setting to ensure safe rollout of tcp receive buffer auto-sizing and peer-state based framing experiments (#31404 )	2 years ago
gen_stats_data.py	Add enforcement for cpp-style comment license in check_copyright.py (#32273 )	2 years ago
gen_switch.py	Remove `include/grpc/impl/codegen/port_platform.h` (#31778 )	2 years ago
gen_upb_api.sh	Revert "Revert "Buildify Envoy upb (#28558 )" (#28648 )" (#28649 )	3 years ago
gen_upb_api_from_bazel_xml.py	[protobuf] Upgrade third_party/protobuf to 22.x (#32606 )	2 years ago
optimize_arena_pool_sizes.py	Reland "[promises] Convert call to a party" (#32651 )" (#32653 )	2 years ago