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Introduce Sv2Transport#27

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2023/12/sv2-transport
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Introduce Sv2Transport#27
Sjors wants to merge 0 commit into2023/11/sv2-pollfrom
2023/12/sv2-transport

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@Sjors Sjors commented Dec 29, 2023 •
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This PR introduces Sv2Transport, a new subclass of Transport.

It's most similar to V2Transport, though with a simpler state machine.

In order to make it easier in the future to move the Stratum v2 integration to its own process, this PR also moves Transport out of net.h and makes it part of bitcoin-common.

This also makes for a nice decluttering of net.{h,cpp}, and useful for utilities that need a one-shot p2p connection, e.g. to fetch a specific block.

It would also allow the wallet to make a one-shot tor connection to broadcast a transaction without going through the node mempool. Though this would require a lot more changes.

Once the Sv2Transport class in this PR works, and the Template Provider switched to use it, I plan to rewrite the history of the main PR bitcoin#28983. The move-only commits should not change in that process.

@Sjors Sjors mentioned this pull request Dec 29, 2023
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Sjors commented Dec 29, 2023 •
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CI on my fork can be ignored (I wonder if I can just turn it off).

In terms of progress, I'm half-way the handshake phase. Next step is implement Act 2 of the handshake, which should be a simple call to WriteMsgES of Sv2HandshakeState m_handshake_state; and updating the cipher like Sv2NoiseSession::ProcessMaybeHandshake does. The test harness can already write it, just needs to read it.

The next challenge is actual message parsing / serialising. The Transport abstract class converts between Span<const uint8_t> and CNetMessage / CSerializedNetMsg, while sv2_messages.h introduces Sv2NetMsg with its own serialisation. I'll have to study both in more detail to figure out if Sv2NetMsg can be made into a subclass of CNetMessage, or if there's another approach.

Finally, the Sv2TemplateProvider comes with its own SendBuf and GenerateWaitSockets. This has a lot of overlap with CConnman in net.h, but CConnman has too much p2p specific stuff to be used as a whole. I might therefore extract its socket handling code into another class.

@Sjors Sjors force-pushed the 2023/12/sv2-transport branch 3 times, most recently from 624f0a5 to 7e89e1b Compare January 5, 2024 16:20
@Sjors Sjors force-pushed the 2023/11/sv2-poll branch from 0b82b7c to 5d47c5a Compare January 8, 2024 20:54
@Sjors Sjors closed this Jan 8, 2024
Sjors pushed a commit that referenced this pull request Mar 5, 2026
@achow101
Merge bitcoin#34655: fuzz: keep coins_view fuzzers within caller co…
76eb04b 
…ntracts

3281824 fuzz: prevent invalid `FRESH` entries and surface `BatchWrite` errors (Lőrinc)
780f460 fuzz: avoid invalid `AddCoin` overwrites (Lőrinc)
d7e0d51 fuzz: make `AddCoins` query view for overwrites (Lőrinc)
b8fa6f0 util: introduce `TrySub` to prevent unsigned underflow (Lőrinc)

Pull request description:

  ### Problem
  This is an alternative approach to bitcoin#34647, fixes bitcoin#34645.

  ### Fix
  First, add `CheckedSub` and use it for decrements of `m_dirty_count` and `cachedCoinsUsage`, so unsigned underflows turn into immediate failures instead of silently wrapping and only failing later.

  <details><summary>Assertion `j <= i' failed.</summary>

  ```bash
  util/overflow.h:44 T CheckedSub(const T, const U) [T = unsigned long, U = bool]: Assertion `j <= i' failed.
  ==72817== ERROR: libFuzzer: deadly signal
      #0 0x556e9225eab5 in __sanitizer_print_stack_trace (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x191dab5) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #1 0x556e921acafc in fuzzer::PrintStackTrace() (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x186bafc) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #2 0x556e92191bb7 in fuzzer::Fuzzer::CrashCallback() (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x1850bb7) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #3 0x7164cfc458cf  (/lib/x86_64-linux-gnu/libc.so.6+0x458cf) (BuildId: ae7440bbdce614e0e79280c3b2e45b1df44e639c)
      #4 0x7164cfca49bb in __pthread_kill_implementation nptl/pthread_kill.c:43:17
      #5 0x7164cfca49bb in __pthread_kill_internal nptl/pthread_kill.c:89:10
      #6 0x7164cfca49bb in pthread_kill nptl/pthread_kill.c:100:10
      #7 0x7164cfc4579d in raise signal/../sysdeps/posix/raise.c:26:13
      #8 0x7164cfc288cc in abort stdlib/abort.c:73:3
      #9 0x556e92f9d591 in assertion_fail(std::source_location const&, std::basic_string_view<char, std::char_traits<char>>) /mnt/my_storage/bitcoin/src/util/check.cpp:41:5
      #10 0x556e9250daf0 in bool&& inline_assertion_check<false, bool>(bool&&, std::source_location const&, std::basic_string_view<char, std::char_traits<char>>) /mnt/my_storage/bitcoin/src/util/check.h:90:13
      #11 0x556e9250daf0 in unsigned long CheckedSub<unsigned long, bool>(unsigned long, bool) /mnt/my_storage/bitcoin/src/util/overflow.h:44:5
      #12 0x556e9250daf0 in CoinsViewCacheCursor::NextAndMaybeErase(std::pair<COutPoint const, CCoinsCacheEntry>&) /mnt/my_storage/bitcoin/src/coins.h:282:25
      #13 0x556e92507eb2 in (anonymous namespace)::MutationGuardCoinsViewCache::BatchWrite(CoinsViewCacheCursor&, uint256 const&) /mnt/my_storage/bitcoin/src/test/fuzz/coins_view.cpp:90:75
      #14 0x556e92c17a2b in CCoinsViewCache::Flush(bool) /mnt/my_storage/bitcoin/src/coins.cpp:282:11
      #15 0x556e924fb732 in TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_1::operator()() const /mnt/my_storage/bitcoin/src/test/fuzz/coins_view.cpp:135:34
      #16 0x556e924fb732 in unsigned long CallOneOf<TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_0, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_1, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_2, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_3, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_4, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_5, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_6, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_7, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_8, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_9, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_10, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_11>(FuzzedDataProvider&, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_0, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_1, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_2, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_3, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_4, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_5, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_6, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_7, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_8, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_9, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_10, TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_11) /mnt/my_storage/bitcoin/src/test/fuzz/util.h:42:27
      #17 0x556e924fb732 in TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool) /mnt/my_storage/bitcoin/src/test/fuzz/coins_view.cpp:114:9
      #18 0x556e92503b0c in coins_view_overlay_fuzz_target(std::span<unsigned char const, 18446744073709551615ul>) /mnt/my_storage/bitcoin/src/test/fuzz/coins_view.cpp:404:5
      #19 0x556e92bcb7a5 in std::function<void (std::span<unsigned char const, 18446744073709551615ul>)>::operator()(std::span<unsigned char const, 18446744073709551615ul>) const /usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/bits/std_function.h:593:9
      #20 0x556e92bcb7a5 in test_one_input(std::span<unsigned char const, 18446744073709551615ul>) /mnt/my_storage/bitcoin/src/test/fuzz/fuzz.cpp:88:5
      #21 0x556e92bcb7a5 in LLVMFuzzerTestOneInput /mnt/my_storage/bitcoin/src/test/fuzz/fuzz.cpp:216:5
      #22 0x556e9219318f in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x185218f) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #23 0x556e92192799 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool, bool*) (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x1851799) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #24 0x556e92194139 in fuzzer::Fuzzer::MutateAndTestOne() (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x1853139) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #25 0x556e92194c95 in fuzzer::Fuzzer::Loop(std::vector<fuzzer::SizedFile, std::allocator<fuzzer::SizedFile>>&) (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x1853c95) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #26 0x556e92181255 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x1840255) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #27 0x556e921ad696 in main (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x186c696) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      #28 0x7164cfc2a577 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
      #29 0x7164cfc2a63a in __libc_start_main csu/../csu/libc-start.c:360:3
      #30 0x556e921757e4 in _start (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x18347e4) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)

  NOTE: libFuzzer has rudimentary signal handlers.
        Combine libFuzzer with AddressSanitizer or similar for better crash reports.
  SUMMARY: libFuzzer: deadly signal
  MS: 2 PersAutoDict-CopyPart- DE: "\005\000"-; base unit: ecb626aff8724f0fdde38a0a6965718f2096d474
  artifact_prefix='/tmp/fuzz_artifacts/'; Test unit written to /tmp/fuzz_artifacts/crash-1d19026c1a23f08bfe693fd684a56ce51187c6e5
  ./build_fuzz/bin/fuzz /tmp/fuzz_corpus/coins_view_overlay -max_total_time=3600 -rss_limit_mb=2560 -artifact_prefix=/tmp/fuzz_artifacts/ >fuzz-16.log 2>&1
  ```

  </details>

  The coins view fuzz targets can call `AddCoin`/`AddCoins` and construct `BatchWrite` cursors in ways that violate `CCoinsViewCache` caller contracts. These invalid states can trigger `BatchWrite` `std::logic_error` and can desync dirty-entry accounting (caught by `Assume(m_dirty_count == 0)` currently).

  Make the fuzzer avoid generating invalid states instead of catching and resetting:
  * Derive `AddCoin`’s `possible_overwrite` from `PeekCoin`, so `possible_overwrite=false` is only used when the outpoint is absent - similarly to https://github.com/bitcoin/bitcoin/blob/67c0d1798e6147f48d4bafc2c9e5ff30f2a62340/src/test/fuzz/coinscache_sim.cpp#L312-L317
  - Only use `AddCoins(check=false)` when we have confirmed the txid has no unspent outputs; otherwise fall back to `check=true` so `AddCoins` determines overwrites via the view.
  - When constructing a `CoinsViewCacheCursor`, avoid setting `FRESH` when the parent already has an unspent coin, and ensure `FRESH` implies `DIRTY`.

  ### Fuzzing
  The original error could be reproduced in ~10 minutes using `coins_view_overlay`. I ran the `coins_view`, `coins_view_db`, `coins_view_overlay`, and `coinscache_sim` fuzzers for this PR overnight and they didn't fail anymore.

ACKs for top commit:
  achow101:
    ACK 3281824
  sipa:
    ACK 3281824. Ran the 4 relevant fuzz tests for ~1 CPU day each. Will run more overnight.
  andrewtoth:
    ACK 3281824

Tree-SHA512: b8155e8d21740eb7800e373c27a8a1457eb84468c24af879bac5a1ed251ade2aec99c34a350a31f2ebb74e41bb7380bf20214d38d14fe23310a43282d2434fb7
Sjors pushed a commit that referenced this pull request Mar 10, 2026
@fanquake
Merge bitcoin#34734: test: Fix shutdown vptr race in BlockFilterIndex…
c0802e2 
…Sync bench

fa79098 test: Fix shutdown vptr race in BlockFilterIndexSync bench (MarcoFalke)

Pull request description:

  Currently, the `BlockFilterIndexSync` may fail tsan.

  Diff to reproduce:

  ```diff
  diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
  index c7be6ab..4cb8435 100644
  --- a/src/validationinterface.cpp
  +++ b/src/validationinterface.cpp
  @@ -14,2 +14,3 @@
   #include <primitives/transaction.h>
  +#include <random.h>
   #include <util/check.h>
  @@ -156,2 +157,4 @@ void ValidationSignals::SyncWithValidationInterfaceQueue()

  +static FastRandomContext g_rnd{};
  +
   // Use a macro instead of a function for conditional logging to prevent
  @@ -166,2 +169,3 @@ void ValidationSignals::SyncWithValidationInterfaceQueue()
               LOG_EVENT(fmt, local_name, __VA_ARGS__);           \
  +            UninterruptibleSleep(1ms * g_rnd.randrange(95));   \
               event();                                           \
  ```

  and then running the tsan CI pod: `MAKEJOBS="-j$(nproc)" FILE_ENV="./ci/test/00_setup_env_native_tsan.sh" ./ci/test_run_all.sh`

  After about 3 runs, it will fail. It is also possible to run in a loop inside the pod: `while TSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/tsan:halt_on_error=1:second_deadlock_stack=1" /ci_container_base/ci/scratch/build-x86_64-pc-linux-gnu/bin/bench_bitcoin -filter=BlockFilterIndexSync -sanity-check ; do true ; done`

  The output will be:

  ```
  Running with -sanity-check option, output is being suppressed as benchmark results will be useless.
  Running with -sanity-check option, output is being suppressed as benchmark results will be useless.
  ==================
  WARNING: ThreadSanitizer: data race on vptr (ctor/dtor vs virtual call) (pid=100168)
    Write of size 8 at 0x7fffbe828aa8 by main thread:
      #0 BaseIndex::~BaseIndex() /ci_container_base/src/index/base.cpp:99:1 (bench_bitcoin+0x33c201) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #1 BlockFilterIndex::~BlockFilterIndex() /ci_container_base/src/index/blockfilterindex.h:40:7 (bench_bitcoin+0x266000) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #2 BlockFilterIndexSync(ankerl::nanobench::Bench&)::$_0::operator()() const /ci_container_base/src/bench/index_blockfilter.cpp:56:5 (bench_bitcoin+0x2659a1) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #3 ankerl::nanobench::Bench& ankerl::nanobench::Bench::run<BlockFilterIndexSync(ankerl::nanobench::Bench&)::$_0>(BlockFilterIndexSync(ankerl::nanobench::Bench&)::$_0&&) /ci_container_base/src/bench/nanobench.h:1221:13 (bench_bitcoin+0x2659a1)
      #4 BlockFilterIndexSync(ankerl::nanobench::Bench&) /ci_container_base/src/bench/index_blockfilter.cpp:46:33 (bench_bitcoin+0x26565a) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #5 std::__1::__invoke_result_impl<void, void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>::type std::__1::__invoke[abi:dee230000]<void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>(void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__type_traits/invoke.h:90:27 (bench_bitcoin+0x21b394) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #6 void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:dee230000]<void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>(void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__type_traits/invoke.h:350:5 (bench_bitcoin+0x21b394)
      #7 void std::__1::__invoke_r[abi:dee230000]<void, void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>(void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__type_traits/invoke.h:356:10 (bench_bitcoin+0x21b394)
      #8 std::__1::__function::__func<void (*)(ankerl::nanobench::Bench&), void (ankerl::nanobench::Bench&)>::operator()(ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0x21b394)
      #9 std::__1::__function::__value_func<void (ankerl::nanobench::Bench&)>::operator()[abi:dee230000](ankerl::nanobench::Bench&) const /cxx_build/include/c++/v1/__functional/function.h:273:12 (bench_bitcoin+0x1cc77d) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #10 std::__1::function<void (ankerl::nanobench::Bench&)>::operator()(ankerl::nanobench::Bench&) const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0x1cc77d)
      #11 benchmark::BenchRunner::RunAll(benchmark::Args const&) /ci_container_base/src/bench/bench.cpp:121:13 (bench_bitcoin+0x1cc77d)
      #12 main /ci_container_base/src/bench/bench_bitcoin.cpp:135:9 (bench_bitcoin+0x1c5a76) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)

    Previous read of size 8 at 0x7fffbe828aa8 by thread T1:
      #0 ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_1::operator()() const::'lambda'(CValidationInterface&)::operator()(CValidationInterface&) const /ci_container_base/src/validationinterface.cpp:231:79 (bench_bitcoin+0x885feb) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #1 void ValidationSignalsImpl::Iterate<ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_1::operator()() const::'lambda'(CValidationInterface&)>(ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_1::operator()() const::'lambda'(CValidationInterface&)&&) /ci_container_base/src/validationinterface.cpp:91:17 (bench_bitcoin+0x885feb)
      #2 ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_1::operator()() const /ci_container_base/src/validationinterface.cpp:231:22 (bench_bitcoin+0x885feb)
      #3 ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0::operator()() const /ci_container_base/src/validationinterface.cpp:233:27 (bench_bitcoin+0x885feb)
      #4 std::__1::__invoke_result_impl<void, ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0&>::type std::__1::__invoke[abi:dee230000]<ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0&>(ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:90:27 (bench_bitcoin+0x885feb)
      #5 void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:dee230000]<ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0&>(ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:350:5 (bench_bitcoin+0x885feb)
      #6 void std::__1::__invoke_r[abi:dee230000]<void, ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0&>(ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:356:10 (bench_bitcoin+0x885feb)
      #7 std::__1::__function::__func<ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0, void ()>::operator()() /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0x885feb)
      #8 std::__1::__function::__value_func<void ()>::operator()[abi:dee230000]() const /cxx_build/include/c++/v1/__functional/function.h:273:12 (bench_bitcoin+0xddec83) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #9 std::__1::function<void ()>::operator()() const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0xddec83)
      #10 SerialTaskRunner::ProcessQueue() /ci_container_base/src/scheduler.cpp:173:5 (bench_bitcoin+0xddec83)
      #11 SerialTaskRunner::MaybeScheduleProcessQueue()::$_0::operator()() const /ci_container_base/src/scheduler.cpp:142:41 (bench_bitcoin+0xde08e5) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #12 std::__1::__invoke_result_impl<void, SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>::type std::__1::__invoke[abi:dee230000]<SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>(SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:90:27 (bench_bitcoin+0xde08e5)
      #13 void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:dee230000]<SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>(SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:350:5 (bench_bitcoin+0xde08e5)
      #14 void std::__1::__invoke_r[abi:dee230000]<void, SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>(SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:356:10 (bench_bitcoin+0xde08e5)
      #15 std::__1::__function::__func<SerialTaskRunner::MaybeScheduleProcessQueue()::$_0, void ()>::operator()() /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0xde08e5)
      #16 std::__1::__function::__value_func<void ()>::operator()[abi:dee230000]() const /cxx_build/include/c++/v1/__functional/function.h:273:12 (bench_bitcoin+0xddda36) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #17 std::__1::function<void ()>::operator()() const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0xddda36)
      #18 CScheduler::serviceQueue() /ci_container_base/src/scheduler.cpp:60:17 (bench_bitcoin+0xddda36)
      #19 ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2::operator()() const /ci_container_base/src/test/util/setup_common.cpp:250:114 (bench_bitcoin+0x2dcaa8) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #20 std::__1::__invoke_result_impl<void, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&>::type std::__1::__invoke[abi:dee230000]<ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&>(ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&) /cxx_build/include/c++/v1/__type_traits/invoke.h:90:27 (bench_bitcoin+0x2dcaa8)
      #21 void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:dee230000]<ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&>(ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&) /cxx_build/include/c++/v1/__type_traits/invoke.h:350:5 (bench_bitcoin+0x2dcaa8)
      #22 void std::__1::__invoke_r[abi:dee230000]<void, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&>(ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&) /cxx_build/include/c++/v1/__type_traits/invoke.h:356:10 (bench_bitcoin+0x2dcaa8)
      #23 std::__1::__function::__func<ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2, void ()>::operator()() /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0x2dcaa8)
      #24 std::__1::__function::__value_func<void ()>::operator()[abi:dee230000]() const /cxx_build/include/c++/v1/__functional/function.h:273:12 (bench_bitcoin+0xef2b0b) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #25 std::__1::function<void ()>::operator()() const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0xef2b0b)
      #26 util::TraceThread(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>) /ci_container_base/src/util/thread.cpp:21:9 (bench_bitcoin+0xef2b0b)
      #27 std::__1::__invoke_result_impl<void, void (*)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const*, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2>::type std::__1::__invoke[abi:dee230000]<void (*)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const*, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2>(void (*&&)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const*&&, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&&) /cxx_build/include/c++/v1/__type_traits/invoke.h:90:27 (bench_bitcoin+0x2dc652) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #28 void std::__1::__thread_execute[abi:dee230000]<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct>>, void (*)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const*, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2, 0ul, 1ul, 2ul>(std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct>>, void (*)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const*, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2>&, std::__1::__integer_sequence<unsigned long, 0ul, 1ul, 2ul>) /cxx_build/include/c++/v1/__thread/thread.h:161:3 (bench_bitcoin+0x2dc652)
      #29 void* std::__1::__thread_proxy[abi:dee230000]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct>>, void (*)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const*, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2>>(void*) /cxx_build/include/c++/v1/__thread/thread.h:169:3 (bench_bitcoin+0x2dc652)

    Location is stack of main thread.

    Thread T1 'b-scheduler' (tid=100170, running) created by main thread at:
      #0 pthread_create <null> (bench_bitcoin+0x13dc4e) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #1 std::__1::__libcpp_thread_create[abi:dee230000](unsigned long*, void* (*)(void*), void*) /cxx_build/include/c++/v1/__thread/support/pthread.h:182:10 (bench_bitcoin+0x2d3531) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #2 std::__1::thread::thread[abi:dee230000]<void (&)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const (&) [10], ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2, 0>(void (&)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const (&) [10], ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2&&) /cxx_build/include/c++/v1/__thread/thread.h:218:16 (bench_bitcoin+0x2d3531)
      #3 ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts) /ci_container_base/src/test/util/setup_common.cpp:250:46 (bench_bitcoin+0x2d3531)
      #4 TestingSetup::TestingSetup(ChainType, TestOpts) /ci_container_base/src/test/util/setup_common.cpp:344:7 (bench_bitcoin+0x2d4c1f) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #5 TestChain100Setup::TestChain100Setup(ChainType, TestOpts) /ci_container_base/src/test/util/setup_common.cpp:380:7 (bench_bitcoin+0x2d560a) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #6 std::__1::unique_ptr<TestChain100Setup, std::__1::default_delete<TestChain100Setup>> std::__1::make_unique[abi:dee230000]<TestChain100Setup, ChainType const&, TestOpts&, 0>(ChainType const&, TestOpts&) /cxx_build/include/c++/v1/__memory/unique_ptr.h:756:30 (bench_bitcoin+0x224eed) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #7 std::__1::unique_ptr<TestChain100Setup, std::__1::default_delete<TestChain100Setup>> MakeNoLogFileContext<TestChain100Setup>(ChainType, TestOpts) /ci_container_base/src/test/util/setup_common.h:259:12 (bench_bitcoin+0x224ce2) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #8 BlockFilterIndexSync(ankerl::nanobench::Bench&) /ci_container_base/src/bench/index_blockfilter.cpp:33:29 (bench_bitcoin+0x26530f) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #9 std::__1::__invoke_result_impl<void, void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>::type std::__1::__invoke[abi:dee230000]<void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>(void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__type_traits/invoke.h:90:27 (bench_bitcoin+0x21b394) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #10 void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:dee230000]<void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>(void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__type_traits/invoke.h:350:5 (bench_bitcoin+0x21b394)
      #11 void std::__1::__invoke_r[abi:dee230000]<void, void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&>(void (*&)(ankerl::nanobench::Bench&), ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__type_traits/invoke.h:356:10 (bench_bitcoin+0x21b394)
      #12 std::__1::__function::__func<void (*)(ankerl::nanobench::Bench&), void (ankerl::nanobench::Bench&)>::operator()(ankerl::nanobench::Bench&) /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0x21b394)
      #13 std::__1::__function::__value_func<void (ankerl::nanobench::Bench&)>::operator()[abi:dee230000](ankerl::nanobench::Bench&) const /cxx_build/include/c++/v1/__functional/function.h:273:12 (bench_bitcoin+0x1cc77d) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      #14 std::__1::function<void (ankerl::nanobench::Bench&)>::operator()(ankerl::nanobench::Bench&) const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0x1cc77d)
      #15 benchmark::BenchRunner::RunAll(benchmark::Args const&) /ci_container_base/src/bench/bench.cpp:121:13 (bench_bitcoin+0x1cc77d)
      #16 main /ci_container_base/src/bench/bench_bitcoin.cpp:135:9 (bench_bitcoin+0x1c5a76) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)

  SUMMARY: ThreadSanitizer: data race on vptr (ctor/dtor vs virtual call) /ci_container_base/src/index/base.cpp:99:1 in BaseIndex::~BaseIndex()
  ==================
  ```

  Fix this by following the shutdown sequence of first stopping the index and then desctructing it, instead of doing both at the same time (stopping inside the desctructor).

  Also, apply the comment `// Shutdown sequence (c.f. Shutdown() in init.cpp)` consistently, while touching this topic of the codebase.

  Also, remove the unused `SyncWithValidationInterfaceQueue`, which is redundant to the prior `BlockUntilSyncedToCurrentChain`. See also the last comment in the pull request that introduced this: bitcoin#26188 (comment)

  > I think anything is fine here. Either keep both or delete both.

  Given that devs did not apply the redundant sync in two new cases, it seems fine to remove it.

ACKs for top commit:
  achow101:
    ACK fa79098
  sedited:
    ACK fa79098

Tree-SHA512: 3f46df283fa5f639e942b74459760104b79f11930b4249f73405f052131f69d01e91a8a4df496ca4f380fd2e0cb8d8c34f70f3e2b84730f3b8f445a98e468d1d
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@Sjors