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backport: v0.26 bitcoin#27888, bitcoin#27941, bitcoin#28213, bitcoin#19690 - #61

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DCG-Claude merged 4 commits into
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backport-0.26-b051-misc
Sep 22, 2026
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DCG-Claude merged 4 commits into
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backport-0.26-b051-misc

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@DCG-Claude DCG-Claude commented Sep 18, 2026 •

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Automated Bitcoin Core v0.26 backports, batch backport-0.26-b051-misc.

upstream commit gates notes
bitcoin#27888 d8f95c8fc7 pick:pass build:pass tests:pass mech:warn tree:pass verify:pass Faithful backport of bitcoin#27888: the MockedDescriptorConverter, the shared TestDescriptor helper, and the new
bitcoin#27941 1ad417b10d pick:pass build:pass tests:pass mech:warn tree:pass verify:pass Faithful backport of the longpoll race fix: all three thr.start() calls are wrapped in assert_debug_log with timeout=3,
bitcoin#28213 97d1ef5a65 pick:pass build:pass tests:pass mech:pass tree:pass verify:pass clean cherry-pick
bitcoin#19690 84256d3e34 pick:pass build:pass tests:pass mech:pass tree:pass verify:pass clean cherry-pick
Provenance

Each commit passed: cherry-pick (adapted by an Opus lane only where conflicts existed), build, touched tests, a mechanical diff-of-diffs check (every upstream hunk landed; no added line without an upstream counterpart), and an independent Opus verification lane where anything was adapted. Gate rows and lane artifacts are in the backportsys DB.

@DCG-Claude
DCG-Claude force-pushed the backport-0.26-b051-misc branch from 47be756 to d7ca269 Compare September 19, 2026 18:08
@DCG-Claude DCG-Claude changed the title backport: v0.26 bitcoin#27888, bitcoin#27941, bitcoin#28213, bitcoin#28637, bitcoin#19690, bitcoin#27469 backport: v0.26 bitcoin#27888, bitcoin#27941, bitcoin#28213, bitcoin#19690, bitcoin#27469, bitcoin#27786 Sep 22, 2026
@DCG-Claude
DCG-Claude force-pushed the backport-0.26-b051-misc branch 2 times, most recently from 35a22d2 to fd92977 Compare September 22, 2026 04:54
@DCG-Claude DCG-Claude changed the title backport: v0.26 bitcoin#27888, bitcoin#27941, bitcoin#28213, bitcoin#19690, bitcoin#27469, bitcoin#27786 backport: v0.26 bitcoin#27888, bitcoin#27941, bitcoin#28213, bitcoin#19690 Sep 22, 2026
@DCG-Claude
DCG-Claude force-pushed the backport-0.26-b051-misc branch 2 times, most recently from a25b5f2 to 84256d3 Compare September 22, 2026 12:39
…g target

BACKPORT NOTE:
Dash adaptations:
- src/test/fuzz/descriptor_parse.cpp: dropped the raw x-only pubkey key type (KEY_TYPES_COUNT 6->5, removed IdIsXOnlyPubKey() and its branch in Init(), renumbered IdIsConstPrivKey/IdIsXpub/IdIsXprv to 2/3/4) because Dash has no taproot and no XOnlyPubKey type; the doc comment was updated to match ---- that's why PR is partial until taproot is implemented
- src/test/fuzz/descriptor_parse.cpp: kept Dash's existing `#include <key.h>` and `#include <script/standard.h>` (not present upstream at this commit) and added `#include <key_io.h>` as upstream does
- src/test/fuzz/descriptor_parse.cpp: kept `SelectParams(CBaseChainParams::MAIN)` instead of upstream's `SelectParams(ChainType::MAIN)`/`#include <util/chaintype.h>`; Dash has not backported the ChainType enum (bitcoin#27491)

-----

131314b fuzz: increase coverage of the descriptor targets (Antoine Poinsot)
90a2474 fuzz: add a new, more efficient, descriptor parsing target (Antoine Poinsot)
d60229e fuzz: make the parsed descriptor testing into a function (Antoine Poinsot)

Pull request description:

  The current descriptor parsing fuzz target requires valid public or private keys to be provided. This is unnecessary as we are only interested in fuzzing the descriptor parsing logic here (other targets are focused on fuzzing keys serializations). And it's pretty inefficient, especially for formats that need a checksum (`xpub`, `xprv`, WIF).

  This introduces a new target that mocks the keys as an index in a list of precomputed keys. Keys are represented as 2 hex characters in the descriptor. The key type (private, public, extended, ..) is deterministically based on this one-byte value. Keys are deterministically generated at target initialization. This is much more efficient and also largely reduces the size of the seeds.
  TL;DR: for instance instead of requiring the fuzzer to generate a `pk(xpub6DdBu7pBoyf7RjnUVhg8y6LFCfca2QAGJ39FcsgXM52Pg7eejUHLBJn4gNMey5dacyt4AjvKzdTQiuLfRdK8rSzyqZPJmNAcYZ9kVVEz4kj)` to parse a valid descriptor, it just needs to generate a `pk(03)`.

  Note we only mock the keys themselves, not the entire descriptor key expression. As we want to fuzz the real code that parses the rest of the key expression (origin, derivation paths, ..).

  This is a target i used for reviewing bitcoin#17190 and bitcoin#27255, and figured it was worth PR'ing on its own since the added complexity for mocking the keys is minimal and it could help prevent introducing bugs to the descriptor parsing logic much more efficiently.

ACKs for top commit:
  MarcoFalke:
    re-ACK 131314b  🐓
  achow101:
    ACK 131314b

Tree-SHA512: 485a8d6a0f31a3a132df94dc57f97bdd81583d63507510debaac6a41dbbb42fa83c704ff3f2bd0b78c8673c583157c9a3efd79410e5e79511859e1470e629118
…emplate_longpoll.py

fa748c6 test: Fix intermittent issue in mining_getblocktemplate_longpoll.py (MarcoFalke)

Pull request description:

  Fixes bitcoin#26962

  Wait for the thread to have started and the RPC to have reached the node before continuing. Otherwise the test may run into a race.

  For example:

  ```
   test  2023-06-23T13:10:29.245000Z TestFramework (INFO): Test that introducing a new transaction into the mempool will terminate the longpoll
   node0 2023-06-23T13:10:29.245712Z [http] [httpserver.cpp:254] [http_request_cb] [http] Received a POST request for / from 127.0.0.1:43568
   node0 2023-06-23T13:10:29.245915Z [httpworker.3] [rpc/request.cpp:181] [parse] [rpc] ThreadRPCServer method=getblocktemplate user=__cookie__
   node0 2023-06-23T13:10:29.252594Z [http] [httpserver.cpp:254] [http_request_cb] [http] Received a POST request for / from 127.0.0.1:43568
   node0 2023-06-23T13:10:29.254545Z [httpworker.2] [rpc/request.cpp:181] [parse] [rpc] ThreadRPCServer method=getblockchaininfo user=__cookie__
   node0 2023-06-23T13:10:29.256530Z [http] [httpserver.cpp:254] [http_request_cb] [http] Received a POST request for / from 127.0.0.1:43568
   node0 2023-06-23T13:10:29.256741Z [httpworker.1] [rpc/request.cpp:181] [parse] [rpc] ThreadRPCServer method=sendrawtransaction user=__cookie__
   node0 2023-06-23T13:10:29.258033Z [httpworker.1] [validationinterface.cpp:213] [TransactionAddedToMempool] [validation] Enqueuing TransactionAddedToMempool: txid=38335600f2465c0f8bb2b86d5830a34851d86fa879800c0e1434ddfc78c42898 wtxid=c033cd3efd301c369d66cf759769159609471bd4f9efb3ee30e7209e57b74778
   node0 2023-06-23T13:10:29.258263Z [httpworker.1] [txmempool.cpp:660] [check] [mempool] Checking mempool with 1 transactions and 1 inputs
   node0 2023-06-23T13:10:29.258542Z [scheduler] [validationinterface.cpp:213] [operator()] [validation] TransactionAddedToMempool: txid=38335600f2465c0f8bb2b86d5830a34851d86fa879800c0e1434ddfc78c42898 wtxid=c033cd3efd301c369d66cf759769159609471bd4f9efb3ee30e7209e57b74778
   node0 2023-06-23T13:10:29.259549Z [http] [httpserver.cpp:254] [http_request_cb] [http] Received a POST request for / from 127.0.0.1:43568
   node0 2023-06-23T13:10:29.259745Z [httpworker.0] [rpc/request.cpp:181] [parse] [rpc] ThreadRPCServer method=decoderawtransaction user=__cookie__
   node0 2023-06-23T13:10:29.261066Z [http] [httpserver.cpp:254] [http_request_cb] [http] Received a POST request for / from 127.0.0.1:52690
   node0 2023-06-23T13:10:29.261803Z [http] [httpserver.cpp:254] [http_request_cb] [http] Received a POST request for / from 127.0.0.1:43568
   node0 2023-06-23T13:10:29.262770Z [httpworker.2] [rpc/request.cpp:181] [parse] [rpc] ThreadRPCServer method=getblocktemplate user=__cookie__
  ```

  (`sendrawtransaction` is called before `getblocktemplate`)

ACKs for top commit:
  jamesob:
    Github ACK bitcoin@fa748c6
  theStack:
    ACK fa748c6

Tree-SHA512: c67d9ec7c56e8a22c1a26a3c3d4d4a4bcc17e4282cad0d66561ba2abd6e92240cb028369b4edc6077ea34e8736c0294f6066381979aee22a6166580cea43729a
…icitly on Windows

6a7686b scripted-diff: Specify Python major version explicitly on Windows (Hennadii Stepanov)

Pull request description:

  On Windows, it is the accepted practice to use `py.exe` launcher:
  - https://learn.microsoft.com/en-us/windows/python/faqs#what-is-py-exe-
  - https://docs.python.org/3/using/windows.html#python-launcher-for-windows

  One of its features is the correct handling of shebang lines like the one we use: `#!/usr/bin/env python3`.

  However, Windows OS app execution aliases might [interfere](https://learn.microsoft.com/en-us/windows/python/faqs#why-does-running-python-exe-open-the-microsoft-store-) with the launcher's behaviour. Such aliases are enabled on Windows 11 by default:

  ![image](https://github.com/bitcoin/bitcoin/assets/32963518/407837ec-e89a-4bc1-98b1-db983002065a)

  For example, on a fresh Windows 11 Pro installation with the Python installed from the [Chocolatey](https://community.chocolatey.org/packages/python/3.11.4) package manager, one will get the following error:
  ```
  >py -3 test\functional\rpc_signer.py
  2023-08-03T19:41:13.353000Z TestFramework (INFO): PRNG seed is: 2694758731106548661
  2023-08-03T19:41:13.353000Z TestFramework (INFO): Initializing test directory C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3
  2023-08-03T19:41:14.538000Z TestFramework (ERROR): Assertion failed
  Traceback (most recent call last):
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\util.py", line 140, in try_rpc
      fun(*args, **kwds)
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\coverage.py", line 50, in __call__
      return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\authproxy.py", line 129, in __call__
      raise JSONRPCException(response['error'], status)
  test_framework.authproxy.JSONRPCException: RunCommandParseJSON error: process(py C:\Users\hebasto\bitcoin\test\functional\mocks\signer.py enumerate) returned 9009: Python was not found; run without arguments to install from the Microsoft Store, or disable this shortcut from Settings > Manage App Execution Aliases.
   (-1)

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\test_framework.py", line 131, in main
      self.run_test()
    File "C:\Users\hebasto\bitcoin\test\functional\rpc_signer.py", line 72, in run_test
      assert_raises_rpc_error(-1, 'fingerprint not found',
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\util.py", line 131, in assert_raises_rpc_error
      assert try_rpc(code, message, fun, *args, **kwds), "No exception raised"
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\hebasto\bitcoin\test\functional\test_framework\util.py", line 146, in try_rpc
      raise AssertionError(
  AssertionError: Expected substring not found in error message:
  substring: 'fingerprint not found'
  error message: 'RunCommandParseJSON error: process(py C:\Users\hebasto\bitcoin\test\functional\mocks\signer.py enumerate) returned 9009: Python was not found; run without arguments to install from the Microsoft Store, or disable this shortcut from Settings > Manage App Execution Aliases.
  '.
  2023-08-03T19:41:14.592000Z TestFramework (INFO): Stopping nodes
  2023-08-03T19:41:14.799000Z TestFramework (WARNING): Not cleaning up dir C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): Test failed. Test logging available at C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3/test_framework.log
  2023-08-03T19:41:14.799000Z TestFramework (ERROR):
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): Hint: Call C:\Users\hebasto\bitcoin\test\functional\combine_logs.py 'C:\Users\hebasto\AppData\Local\Temp\bitcoin_func_test_mldbzzw3' to consolidate all logs
  2023-08-03T19:41:14.799000Z TestFramework (ERROR):
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): If this failure happened unexpectedly or intermittently, please file a bug and provide a link or upload of the combined log.
  2023-08-03T19:41:14.799000Z TestFramework (ERROR): https://github.com/bitcoin/bitcoin/issues
  2023-08-03T19:41:14.799000Z TestFramework (ERROR):

  ```

  This PR resolves this issue by explicitly specifying the Python major version and makes testing of self-compiled binaries more straightforward.

ACKs for top commit:
  MarcoFalke:
    lgtm ACK 6a7686b
  stickies-v:
    utACK 6a7686b

Tree-SHA512: 5681141e222bc833c6250cb79fe3a1c8e02255eb2c86010bc0f8239afcdfed784ed7788c8579209d931bd357f58d5655cf33ffeb2f46b1879f37cdc30e7a7c91
72efc26 util: improve streams.h:FindByte() performance (Larry Ruane)
604df63 [bench] add streams findbyte (gzhao408)

Pull request description:

  This PR is strictly a performance improvement; there is no functional change. The `CBufferedFile::FindByte()` method searches for the next occurrence of the given byte in the file. Currently, this is done by explicitly inspecting each byte in turn. This PR takes advantage of `std::find()` to do the same more efficiently, improving its CPU runtime by a factor of about 25 in typical use.

ACKs for top commit:
  achow101:
    re-ACK 72efc26
  stickies-v:
    re-ACK 72efc26

Tree-SHA512: ddf0bff335cc8aa34f911aa4e0558fa77ce35d963d602e4ab1c63090b4a386faf074548daf06ee829c7f2c760d06eed0125cf4c34e981c6129cea1804eb3b719
@knst
knst force-pushed the backport-0.26-b051-misc branch from 84256d3 to bdfa551 Compare September 22, 2026 12:47
@DCG-Claude
DCG-Claude merged commit ecb2601 into develop Sep 22, 2026
28 checks passed
@DCG-Claude

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merged as dashpay#7697

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