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[Testing] additional silent payments tests - descriptors + spend(send) - Replaces PR #1#2

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[Testing] additional silent payments tests - descriptors + spend(send) - Replaces PR #1#2
macgyver13 wants to merge 43 commits intoEunovo:2025-implement-bip352-receivingfrom
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This PR includes additional testing that exposes a few issues with silent payments.

1 of the working tests was already resolved last week 👏

The 2 broken tests highlight issues that need attention. Let me know if you need any additional details.

@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch 2 times, most recently from d543c87 to 50fafd9 Compare August 13, 2025 08:39
2b57d2ad89 docs: update README
5d2d4adabd ci: enable silentpayments module
d6788a888c tests: add constant time tests
4c32ba9613 tests: add BIP-352 test vectors
183e5414f7 silentpayments: add benchmarks for scanning
288390446a silentpayments: add examples/silentpayments.c
250beff5d2 silentpayments: receiving
f90d7a76b0 silentpayments: recipient label support
1a5f53f2cf silentpayments: sending
ca2538a878 build: add skeleton for new silentpayments (BIP352) module

git-subtree-dir: src/secp256k1
git-subtree-split: 2b57d2ad8964e536508fae0b6ab1331396fe0308
@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch from 50fafd9 to 01e275b Compare August 13, 2025 11:19
@macgyver13 macgyver13 force-pushed the bip352-receiving-testing branch 2 times, most recently from a615ae7 to 0e7fbf9 Compare August 13, 2025 21:59
josibake and others added 24 commits August 14, 2025 08:56
Add a method for passing a KeyPair object to secp256k1 functions expecting a secp256k1_keypair.
This allows for passing a KeyPair directly to a secp256k1 function without needing to create a
temporary secp256k1_keypair object.
Wrap the silentpayments module from libsecp256k1. This is placed in
common as it is intended to be used by:

  * RPCs: for parsing addresses
  * Wallet: for sending, receiving, spending silent payment outputs
  * Node: for creating silent payment indexes for light clients
Have `IsValidDestination` return false for silent payment destinations
and set an error string when decoding a silent payment address.

This prevents anyone from sending to a silent payment address before
sending is implemented in the wallet, but also allows the functions to
be used in the unit testing famework.
Use the test vectors to test sending and receiving. A few cases are not
covered here, namely anything that requires testing specific to the
wallet. For example:

* Taproot script path spending is not tested, as that is better tested in
  a wallets coin selection / signing logic
* Re-computing outputs during RBF is not tested, as that is better
  tested in a wallets RBF logic

The unit tests are written in such a way that adding new test cases is
as easy as updating the JSON file
BIP352 v0 specifies that a silent payment output is a taproot output.
Taproot scriptPubKeys are a fixed size, so when calculating the
serialized size for a CRecipient with a V0SilentPayments destination,
use WitnessV1Taproot for the serialized txout size.
Add a method for retreiving a private key for a given scriptPubKey.
If the scriptPubKey is a taproot output, tweak the private key with the
merkle root or hash of the public key, if applicable.
Add a flag to the `CoinControl` object if silent payment destinations
are provided. Before adding the flag, call a function which checks if:

* The wallet has private keys
* The wallet is unlocked

Without both of the above being true, we cannot send to a silent payment
address.

During coin selection, if this flag is set, skip taproot inputs when
script spend data is available. This is based on the assumption that if
a user provides script spend data, they don't have access to the key
path spend. As future improvement, we could instead check to see if we
have access to the key path spend, and only exclude the output when we
don't regardless of whether or not the user provides script spend data.

Also skip UTXOs of type `WITNESS_UNKNOWN`, although it is very unlikely
our wallet would ever try to spend a witness unknown output.
`CreateSilentPaymentsOutputs` gets the correct private keys, adds them
together, groups the silent payment destinations and then generates the
taproot script pubkeys. These are then passed back to
CreateTransactionInternal, which uses these scriptPubKeys to update
vecSend before adding them to the transaction outputs.
If sending to a silent payment destination, the change type should be taproot
Treat silent payment addresses as valid destination. Also disable using
silent payment addresses with the `addr()` descriptor, as this
descriptor expects an encoding of a scriptPubKey, whereas a silent
payment address consists of instructions on how to generate a
scriptPubKey for the recipient.

Co-authored-by: Oghenovo Usiwoma <37949128+eunovo@users.noreply.github.com>
While the scankey looks like a private key, and is represented as a `CKey` in the code,
it is actually much closer to a public key and it needs to be treated as a public key,
so it can be added to watch-only wallets.
sp() expects a scan private key and a spend key which could be a private key
or a public key.
The scan key is really a "scan entropy" and will not be treated as an actual
private key
This method makes it easier to tweak silent payment spend keys in later commits
The spent_coins data will be used to scan for silent payments in later commits

Co-authored-by: Ava Chow <github@achow101.com>
This undo data will be used to scan for silent payments in later commits

Co-authored-by: Ava Chow <github@achow101.com>
Co-authored-by: Ava Chow <github@achow101.com>
Eunovo and others added 12 commits August 14, 2025 10:04
Co-authored-by: Ava Chow <github@achow101.com>
traditionally, the receiving scripts are known to the core wallet
because they are added to the addressbook at the time they are requested.

in silent payments, the outputs are not known until found. its important, however,
to have the found scripts in the addressbook so all of the change accounting can be down
properly.

this commits adds found outputs to the address book if they are not change. the way
change is determined is a bit hacky in that we just check if the found output was
found with a label (since this is the only label currently implemented). in the future,
we should specifically check for a change specific label.
Check if a send is a self transfer when the transaction is created. This ensures
our cache and address book is properly updated since the wallet will not recheck
this transaction fully if it detects change.
The wallet tries to match change OutputTpe to other outputs to preserve privacy.
Use silent payment change address when sending coins to:
- any silent payment address
- any taproot address
`CreateTransaction` fails if change_type is set to OutputType::SILENT_PAYMENTS
and there are no eligible inputs for the transaction. This commit modifies
`CreateTransaction` logic to make a second attempt to
create a tx without OutputType::SILENT_PAYMENTS change_type
This allows wallets with only sp descs to use sp change destination for transactions.
@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch from 01e275b to 09277cb Compare August 14, 2025 08:04
@macgyver13 macgyver13 force-pushed the bip352-receiving-testing branch from 0e7fbf9 to 1981a1c Compare August 14, 2025 11:16
@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch 3 times, most recently from f86b9d2 to 7150948 Compare August 19, 2025 14:08
@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch 2 times, most recently from 891b8dd to cc0b97b Compare September 11, 2025 09:34
@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch from cc0b97b to 55485a6 Compare September 18, 2025 14:12
@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch 2 times, most recently from fcc8b88 to 3bfab00 Compare December 1, 2025 10:13
Eunovo pushed a commit that referenced this pull request Jan 19, 2026
… corruption check in fees.dat

fa1d17d refactor: Use uint64_t over size_t for serialize corruption check in fees.dat (MarcoFalke)

Pull request description:

  Serialization should not behave differently on different architectures. See also the related commit 3789215.

  However, on fees.dat file corruption, 32-bit builds may run into an unsigned integer overflow and report the wrong corruption reason, or may even silently continue after the corruption.

  This is a bit hard to reproduce, because 32-bit platforms are rare and most of them don't support running the unsigned integer overflow sanitizer. So the possible options to reproduce are:

  * Run on armhf and manually annotate the code to detect the overflow
  * Run on i386 with the integer sanitizer (possibly via `podman run -it --rm --platform linux/i386 'debian:trixie'`)
  * Run the integer sanitizer on any 64-bit platform and manually replace type in the affected line by `uint32_t`

  Afterwards, the steps to reproduce are:

  ```
  export DEBIAN_FRONTEND=noninteractive && apt update && apt install curl wget htop git vim ccache -y && git clone https://github.com/bitcoin/bitcoin.git  --depth=1 ./b-c && cd b-c && apt install build-essential cmake pkg-config  python3-zmq libzmq3-dev libevent-dev libboost-dev libsqlite3-dev  systemtap-sdt-dev  libcapnp-dev capnproto  libqrencode-dev qt6-tools-dev qt6-l10n-tools qt6-base-dev  clang llvm libc++-dev libc++abi-dev   -y

  cmake -B ./bld-cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER='clang' -DCMAKE_CXX_COMPILER='clang++' -DSANITIZERS=undefined,integer,float-divide-by-zero --preset=dev-mode

  cmake --build ./bld-cmake --parallel  $(nproc)

  curl -fLO 'https://github.com/bitcoin-core/qa-assets/raw/b5ad78e070e4cf36beb415d7b490d948d70ba73f/fuzz_corpora/policy_estimator_io/607473137013139e3676e30ec4b29639e673fa9b'

  UBSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1" FUZZ=policy_estimator_io ./bld-cmake/bin/fuzz ./607473137013139e3676e30ec4b29639e673fa9b
  ```

  The output will be something like:

  ```
  /b-c/src/policy/fees/block_policy_estimator.cpp:448:25: runtime error: unsigned integer overflow: 346685954 * 219 cannot be represented in type 'unsigned int'
      #0 0x5b0b1bbe in TxConfirmStats::Read(AutoFile&, unsigned int) /b-c/bld-cmake/src/./policy/fees/block_policy_estimator.cpp:448:25
      #1 0x5b0b7d3f in CBlockPolicyEstimator::Read(AutoFile&) /b-c/bld-cmake/src/./policy/fees/block_policy_estimator.cpp:1037:29
      #2 0x592a9783 in policy_estimator_io_fuzz_target(std::span<unsigned char const, 4294967295u>) /b-c/bld-cmake/src/test/fuzz/./test/fuzz/policy_estimator_io.cpp:32:32
      #3 0x5896ba8e in void std::__invoke_impl<void, void (*&)(std::span<unsigned char const, 4294967295u>), std::span<unsigned char const, 4294967295u>>(std::__invoke_other, void (*&)(std::span<unsigned char const, 4294967295u>), std::span<unsigned char const, 4294967295u>&&) /usr/lib/gcc/i686-linux-gnu/14/../../../../include/c++/14/bits/invoke.h:61:14
      bitcoin#4 0x5896b8eb in std::enable_if<is_invocable_r_v<void, void (*&)(std::span<unsigned char const, 4294967295u>), std::span<unsigned char const, 4294967295u>>, void>::type std::__invoke_r<void, void (*&)(std::span<unsigned char const, 4294967295u>), std::span<unsigned char const, 4294967295u>>(void (*&)(std::span<unsigned char const, 4294967295u>), std::span<unsigned char const, 4294967295u>&&) /usr/lib/gcc/i686-linux-gnu/14/../../../../include/c++/14/bits/invoke.h:111:2
      bitcoin#5 0x5896b44b in std::_Function_handler<void (std::span<unsigned char const, 4294967295u>), void (*)(std::span<unsigned char const, 4294967295u>)>::_M_invoke(std::_Any_data const&, std::span<unsigned char const, 4294967295u>&&) /usr/lib/gcc/i686-linux-gnu/14/../../../../include/c++/14/bits/std_function.h:290:9
      bitcoin#6 0x59845c95 in std::function<void (std::span<unsigned char const, 4294967295u>)>::operator()(std::span<unsigned char const, 4294967295u>) const /usr/lib/gcc/i686-linux-gnu/14/../../../../include/c++/14/bits/std_function.h:591:9
      bitcoin#7 0x5983a0da in test_one_input(std::span<unsigned char const, 4294967295u>) /b-c/bld-cmake/src/test/fuzz/util/./test/fuzz/fuzz.cpp:88:5
      bitcoin#8 0x5983cb80 in main /b-c/bld-cmake/src/test/fuzz/util/./test/fuzz/fuzz.cpp:271:13
      bitcoin#9 0xf75aecc2  (/lib/i386-linux-gnu/libc.so.6+0x24cc2) (BuildId: 2dc5f2945fad35c1b07d1a5a32520b3c41afaa75)
      bitcoin#10 0xf75aed87 in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x24d87) (BuildId: 2dc5f2945fad35c1b07d1a5a32520b3c41afaa75)
      bitcoin#11 0x58932db6 in _start (/b-c/bld-cmake/bin/fuzz+0x235ddb6) (BuildId: 7d8d83a77923f14e99c0de64acbc5f5bfc2cce9b)

  SUMMARY: UndefinedBehaviorSanitizer: unsigned-integer-overflow /b-c/src/policy/fees/block_policy_estimator.cpp:448:25
  ```

  Note: This is marked a "refactor", because the code change does not affect 64-bit builds, and on the still remaining rare 32-bit builds today it is extremely unlikely to happen in production.

ACKs for top commit:
  bensig:
    ACK fa1d17d
  ismaelsadeeq:
    utACK fa1d17d
  luke-jr:
    Also, utACK fa1d17d as an improvement.

Tree-SHA512: 696bf8e0dbe4777c84cb90e313c7f8f9ee90d4b3e64de1222f8472b2d9d0f3a0f6f027fda743dd6ca8c6aab94f404db7a65bb562a76000d9c33a8a39de28d8d4
@Eunovo Eunovo force-pushed the 2025-implement-bip352-receiving branch from 3bfab00 to 9ecf265 Compare February 10, 2026 15:49
Eunovo pushed a commit that referenced this pull request Feb 25, 2026
…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)
      bitcoin#4 0x7164cfca49bb in __pthread_kill_implementation nptl/pthread_kill.c:43:17
      bitcoin#5 0x7164cfca49bb in __pthread_kill_internal nptl/pthread_kill.c:89:10
      bitcoin#6 0x7164cfca49bb in pthread_kill nptl/pthread_kill.c:100:10
      bitcoin#7 0x7164cfc4579d in raise signal/../sysdeps/posix/raise.c:26:13
      bitcoin#8 0x7164cfc288cc in abort stdlib/abort.c:73:3
      bitcoin#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
      bitcoin#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
      bitcoin#11 0x556e9250daf0 in unsigned long CheckedSub<unsigned long, bool>(unsigned long, bool) /mnt/my_storage/bitcoin/src/util/overflow.h:44:5
      bitcoin#12 0x556e9250daf0 in CoinsViewCacheCursor::NextAndMaybeErase(std::pair<COutPoint const, CCoinsCacheEntry>&) /mnt/my_storage/bitcoin/src/coins.h:282:25
      bitcoin#13 0x556e92507eb2 in (anonymous namespace)::MutationGuardCoinsViewCache::BatchWrite(CoinsViewCacheCursor&, uint256 const&) /mnt/my_storage/bitcoin/src/test/fuzz/coins_view.cpp:90:75
      bitcoin#14 0x556e92c17a2b in CCoinsViewCache::Flush(bool) /mnt/my_storage/bitcoin/src/coins.cpp:282:11
      bitcoin#15 0x556e924fb732 in TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_1::operator()() const /mnt/my_storage/bitcoin/src/test/fuzz/coins_view.cpp:135:34
      bitcoin#16 0x556e924fb732 in unsigned long CallOneOf<TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool)::$_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
      bitcoin#17 0x556e924fb732 in TestCoinsView(FuzzedDataProvider&, CCoinsViewCache&, CCoinsView&, bool) /mnt/my_storage/bitcoin/src/test/fuzz/coins_view.cpp:114:9
      bitcoin#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
      bitcoin#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
      bitcoin#20 0x556e92bcb7a5 in test_one_input(std::span<unsigned char const, 18446744073709551615ul>) /mnt/my_storage/bitcoin/src/test/fuzz/fuzz.cpp:88:5
      bitcoin#21 0x556e92bcb7a5 in LLVMFuzzerTestOneInput /mnt/my_storage/bitcoin/src/test/fuzz/fuzz.cpp:216:5
      bitcoin#22 0x556e9219318f in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x185218f) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      bitcoin#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)
      bitcoin#24 0x556e92194139 in fuzzer::Fuzzer::MutateAndTestOne() (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x1853139) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      bitcoin#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)
      bitcoin#26 0x556e92181255 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x1840255) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      bitcoin#27 0x556e921ad696 in main (/mnt/my_storage/bitcoin/build_fuzz/bin/fuzz+0x186c696) (BuildId: d77c4d5f9dfd38ea06fab463f49341735205e109)
      bitcoin#28 0x7164cfc2a577 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
      bitcoin#29 0x7164cfc2a63a in __libc_start_main csu/../csu/libc-start.c:360:3
      bitcoin#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
Eunovo pushed a commit that referenced this pull request Mar 17, 2026
…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)
      bitcoin#4 BlockFilterIndexSync(ankerl::nanobench::Bench&) /ci_container_base/src/bench/index_blockfilter.cpp:46:33 (bench_bitcoin+0x26565a) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#11 benchmark::BenchRunner::RunAll(benchmark::Args const&) /ci_container_base/src/bench/bench.cpp:121:13 (bench_bitcoin+0x1cc77d)
      bitcoin#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)::$_0::operator()() const /ci_container_base/src/validationinterface.cpp:233:27 (bench_bitcoin+0x885feb)
      bitcoin#4 std::__1::__invoke_result_impl<void, ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#7 std::__1::__function::__func<ValidationSignals::MempoolTransactionsRemovedForBlock(std::__1::vector<RemovedMempoolTransactionInfo, std::__1::allocator<RemovedMempoolTransactionInfo>> const&, unsigned int)::$_0, void ()>::operator()() /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0x885feb)
      bitcoin#8 std::__1::__function::__value_func<void ()>::operator()[abi:dee230000]() const /cxx_build/include/c++/v1/__functional/function.h:273:12 (bench_bitcoin+0xddec83) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#9 std::__1::function<void ()>::operator()() const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0xddec83)
      bitcoin#10 SerialTaskRunner::ProcessQueue() /ci_container_base/src/scheduler.cpp:173:5 (bench_bitcoin+0xddec83)
      bitcoin#11 SerialTaskRunner::MaybeScheduleProcessQueue()::$_0::operator()() const /ci_container_base/src/scheduler.cpp:142:41 (bench_bitcoin+0xde08e5) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#12 std::__1::__invoke_result_impl<void, SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>::type std::__1::__invoke[abi:dee230000]<SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>(SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:90:27 (bench_bitcoin+0xde08e5)
      bitcoin#13 void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:dee230000]<SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>(SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:350:5 (bench_bitcoin+0xde08e5)
      bitcoin#14 void std::__1::__invoke_r[abi:dee230000]<void, SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&>(SerialTaskRunner::MaybeScheduleProcessQueue()::$_0&) /cxx_build/include/c++/v1/__type_traits/invoke.h:356:10 (bench_bitcoin+0xde08e5)
      bitcoin#15 std::__1::__function::__func<SerialTaskRunner::MaybeScheduleProcessQueue()::$_0, void ()>::operator()() /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0xde08e5)
      bitcoin#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)
      bitcoin#17 std::__1::function<void ()>::operator()() const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0xddda36)
      bitcoin#18 CScheduler::serviceQueue() /ci_container_base/src/scheduler.cpp:60:17 (bench_bitcoin+0xddda36)
      bitcoin#19 ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2::operator()() const /ci_container_base/src/test/util/setup_common.cpp:250:114 (bench_bitcoin+0x2dcaa8) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#20 std::__1::__invoke_result_impl<void, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#23 std::__1::__function::__func<ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_2, void ()>::operator()() /cxx_build/include/c++/v1/__functional/function.h:172:12 (bench_bitcoin+0x2dcaa8)
      bitcoin#24 std::__1::__function::__value_func<void ()>::operator()[abi:dee230000]() const /cxx_build/include/c++/v1/__functional/function.h:273:12 (bench_bitcoin+0xef2b0b) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#25 std::__1::function<void ()>::operator()() const /cxx_build/include/c++/v1/__functional/function.h:754:10 (bench_bitcoin+0xef2b0b)
      bitcoin#26 util::TraceThread(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>) /ci_container_base/src/util/thread.cpp:21:9 (bench_bitcoin+0xef2b0b)
      bitcoin#27 std::__1::__invoke_result_impl<void, void (*)(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::function<void ()>), char const*, ChainTestingSetup::ChainTestingSetup(ChainType, TestOpts)::$_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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#4 TestingSetup::TestingSetup(ChainType, TestOpts) /ci_container_base/src/test/util/setup_common.cpp:344:7 (bench_bitcoin+0x2d4c1f) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#5 TestChain100Setup::TestChain100Setup(ChainType, TestOpts) /ci_container_base/src/test/util/setup_common.cpp:380:7 (bench_bitcoin+0x2d560a) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#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)
      bitcoin#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)
      bitcoin#8 BlockFilterIndexSync(ankerl::nanobench::Bench&) /ci_container_base/src/bench/index_blockfilter.cpp:33:29 (bench_bitcoin+0x26530f) (BuildId: d6021b6fabe0b72ef5741922cc8e7f71ce6eac0c)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#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)
      bitcoin#15 benchmark::BenchRunner::RunAll(benchmark::Args const&) /ci_container_base/src/bench/bench.cpp:121:13 (bench_bitcoin+0x1cc77d)
      bitcoin#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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3 participants