acf8abc7f3cf7efa418a46f9f69f23f1a5035582 gui: Fix unintialized WalletView::progressDialog (João Barbosa)
Pull request description:
#17911 shows that it's possible to read the unintialized `progressDialog` in f32564f0a7/src/qt/walletview.cpp (L296-L297).
And the debugger shows
```
(gdb) bt
#0 0x0000555556687c60 in QProgressDialog::wasCanceled() const ()
#1 0x000055555572989f in WalletView::showProgress (this=0x5555577d7a70,
title=..., nProgress=1) at qt/walletview.cpp:322
```
Closes#17911.
ACKs for top commit:
hebasto:
ACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582, I have reviewed the code and it looks OK, I agree it can be merged.
elichai:
utACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582
kristapsk:
ACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582
MarcoFalke:
ACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582
Tree-SHA512: f5e6d873192d08d1a572e66e17c2e06d1ce27d01aa196b2a7ed591008641295bb02cda8ac90919ff2d2fc778316c2e143f8d36599e0d377779758853dfaf0a31
900d8f6f70859f528e84c5c38d0332f81d19df55 util: Disallow network-qualified command line options (Russell Yanofsky)
Pull request description:
Previously these were allowed but ignored.
This change implements one of the settings simplifications listed in #17508. Change includes release notes.
ACKs for top commit:
laanwj:
ACK 900d8f6f70859f528e84c5c38d0332f81d19df55
Tree-SHA512: ab020a16a86c1e8ec709fbf798d533879d32c565eceeb7eb785c33042c49c6b4d1108c5453d8166e4a2abffc2c8802fbb6d3b895e0ddeefa8f274fd647e3c8ad
ff59bcd3213ef61f2167c0aa60fcaf5afbc20c61 gui: Drop PeerTableModel dependency to ClientModel (João Barbosa)
Pull request description:
Class `PeerTableModel` doesn't actually depend on `ClientModel`.
ACKs for top commit:
Empact:
Code Review ACK ff59bcd321
hebasto:
ACK ff59bcd3213ef61f2167c0aa60fcaf5afbc20c61, tested on Linux Mint 19.3. No changes in behavior are observed.
Tree-SHA512: 29fa3c316c05b8f7b9340e5859bbb8c3a0b826aa7c865c892cfa13b5ad30f822fcaae4e01555f7860cd1727f20b7ef555a808235522a04a6eebaaa7b605f8595
0a50019fde7781263e0c8f041d1d9dcb0dee77e8 Walk pindexBestHeader back to ChainActive().Tip() if it is invalid (Matt Corallo)
Pull request description:
Instead of keeping pindexBestHeader set to the best header we've
ever seen, reset it back to our validated tip if we find an ancestor
of it turns out to be invalid. While the name is now a bit confusing,
this matches much better with how it is used in practice, see below.
Further, this opens up more use-cases for it in the future, namely
aggressively searching for new peers in case we have discovered
(possibly via some covert channel) headers which we do not know to be
invalid, but which we cannot find block data for.
Places pindexBestHeader is used:
* Various GUI displays of the best header and getblockchaininfo["headers"],
I don't think changing this is bad, and if anything this is less confusing
in the presence of an invalid block.
* IsCurrentForFeeEstimation(): If anything I think ensuring pindexBestHeader
isn't some crazy invalid chain is better than the alternative, even in the
case where you are rejecting the current chain due to hardware error (since
hopefully in that case you won't get any new blocks anyway).
* ConnectBlock assumevalid checks: We use pindexBestHeader to check that the
block we're connecting leads to something with nMinimumChainWork (preventing
a user-set assumevalid from having bogus work) and that the block we're
connecting leads to pindexBestHeader (I'm not too worried about this one -
it's nice to "disable" assumevalid if we have a long invalid headers chain,
but I don't see it as a critical protection).
* BlockRequestAllowed() uses pindexBestHeader as its target to ensure the
requested block is within a month of the "current chain". I don't think this
is a meaningful difference, if we're rejecting the current tip we're
trivially fingerprintable anyway, and if the chain really does have a bunch
of invalid crap near the tip, using the best not-invalid header is likely a
better criteria.
* ProcessGetBlockData uses pindexBestHeader as the "current chain" definition
of whether a block request is "historical" for the purpose of bandwidth
limiting. Similarly, I don't see why this is a meaningful change.
* We use pindexBestHeader for requesting missing headers on receipt of a
headers/compact block message or block inv as well as for initial getheaders.
I think this is definitely wrong, using the best not-invalid header for such
requests is much better.
* We use pindexBestHeader to define the "current chain" for deciding when
we're close to done with initial headers sync. I don't think this is a
meaningful change.
* We use pindexBestHeader to decide if initial headers sync has timed out. If
we're rejecting the chain due to hardware error this may result in
additional cases where we ban a peer, but this is already true, so I think
its fine.
ACKs for top commit:
fjahr:
ACK 0a50019fde7781263e0c8f041d1d9dcb0dee77e8
kallewoof:
ACK 0a50019fde7781263e0c8f041d1d9dcb0dee77e8
ariard:
utACK 0a50019
Tree-SHA512: 2ecfa973a9878a00313ae7ede94a9bd7710e0caf55b544b10bbc46dc463a0478cbaf477e6cdd072356d5a0c5fb3848e9339284af785a2995c20bae8bd23f23e5
9a299a59cc8a9ab516e047356c5bc0e93774b557 net: reference instead of copy in BlockConnected range loop (Jon Atack)
Pull request description:
Reference elements in range for loop instead of copying them and
fix Clang `-Wrange-loop-analysis` warning introduced in a029e18
```
net_processing.cpp:1185:25: warning: loop variable 'ptx' of
type 'const std::shared_ptr<const CTransaction>' creates a copy from
type 'const std::shared_ptr<const CTransaction>' [-Wrange-loop-analysis]
for (const auto ptx : pblock->vtx) {
^
net_processing.cpp:1185:14: note: use reference type
'const std::shared_ptr<const CTransaction> &' to prevent copying
for (const auto ptx : pblock->vtx) {
^~~~~~~~~~~~~~~~
1 warning generated.
```
ACKs for top commit:
Empact:
ACK 9a299a59cc
MarcoFalke:
ACK 9a299a59cc8a9ab516e047356c5bc0e93774b557
promag:
ACK 9a299a59cc8a9ab516e047356c5bc0e93774b557.
elichai:
ACK 9a299a59cc8a9ab516e047356c5bc0e93774b557
emilengler:
ACK 9a299a5.
Tree-SHA512: 9284d1b00684877505454a05071212758c8cea083534e2eec09bfc8a9c3059eea811d2008f6a5a678539444f0d5b3134db1bd23da6514b3d3a1440634c8b53be
cb8a86d9f952401eaad68b2e3818ce50f7befd91 gui: Remove WalletView and BitcoinGUI circular dependency (João Barbosa)
ac3d10777d65b68862c6deb57594c8fc4d21ca77 gui: Add transactionClicked and coinsSent signals to WalletView (João Barbosa)
Pull request description:
Essentially moves the code in `WalletView::setBitcoinGUI` to the only caller. Two new signals are added beforehand in the first commit so that the connections in `WalletFrame` are all from the wallet view.
ACKs for top commit:
hebasto:
ACK cb8a86d9f952401eaad68b2e3818ce50f7befd91, tested on Linux Mint 19.3.
jonasschnelli:
utACK cb8a86d9f952401eaad68b2e3818ce50f7befd91
Tree-SHA512: 250316cd3689e51c8cded9ccd75963c836dcafa6db25d684f2aa691dea9738895f9140793e0f925784909e39f8257f7e1c7d611e8bd6d6634e1a50333f4ddb1e
3aee10b80b9d9a0f5172fc2ee75f03a37d5c3863 gui: Drop ShutdownWindow dependency to BitcoinGUI (João Barbosa)
61eb058cc10592cfa314ba2209fb370706100e8b gui: Drop BanTableModel dependency to ClientModel (João Barbosa)
Pull request description:
`ShutdownWindow::showShutdownWindow` just needs a widget to center the shutdown window and to borrow its title.
ACKs for top commit:
hebasto:
ACK 3aee10b80b9d9a0f5172fc2ee75f03a37d5c3863, since previous review only suggested change `QWidget` --> `QMainWindow`
jonasschnelli:
utACK 3aee10b80b9d9a0f5172fc2ee75f03a37d5c3863
Tree-SHA512: e15cb6ee274730bd071d3d97b540c5059e5c655248d69a37c3fd00f2aacc6cfcb36b9a65755718027e15482ec8e5e85534c1dc13d0ddb4e0680df03fbf6571f2
a029e18c2bf67dd00552b0f4bbc85fa2fa5b973b Use rolling bloom filter of recent block tx's for AlreadyHave() check (Suhas Daftuar)
Pull request description:
In order to determine whether to download or process a relayed transaction, we first try to check whether we already have the transaction -- either in the mempool, in our filter of recently rejected transactions, in our orphan pool, or already confirmed in a block.
Prior to this commit, the heuristic for checking whether a transaction was confirmed in a block is based on whether there's a coin cache entry corresponding to the 0- or 1-index vout of the tx. While that is a quick check, it is very imprecise (eg if those outputs were already spent in another block, we wouldn't detect that the transaction has already been confirmed) -- we can do better by just keeping a rolling bloom filter of the transactions in recent blocks, which will better capture the case of a transaction which has been confirmed and then fully spent.
This should reduce the bandwidth that we waste by requesting transactions which will not be accepted to the mempool.
To avoid relay problems for transactions which have been included in a recent block but then reorged out of the chain, we clear the bloom filter whenever a block is disconnected.
ACKs for top commit:
MarcoFalke:
re-ACK a029e18c2b only stylistic and comment fixups 🍴
sipa:
utACK a029e18c2bf67dd00552b0f4bbc85fa2fa5b973b
jonatack:
Code review ACK a029e18c2bf67dd00552b0f4bbc85fa2fa5b973b also built/ran tests and am running bitcoind with mempool debug logging and custom logging. Looked a bit into CRollingBloomFilter and also the mempool median time past checks mentioned above; I don't have a deep understanding of those areas yet but the concept here and changes LGTM. Tests and other optimisations could be added as a follow-up. In favor of seeing this move forward if no major immediate concerns.
Tree-SHA512: 784c9a35bcd3af5db469063ac7d26b4bac430e451e5637a34d8a538c3ffd1433abdd3f06e5584e7a84bfa9e791449e61819397b5a6c7890fa59d78ec3ba507b2
f41d58966995fe69df433fa684117fae74a56e66 Document better -keypool as a look-ahead safety mechanism (Antoine Riard)
Pull request description:
If after a backup, an address is issued beyond the initial
keypool range and none of the addresses in this range
is seen onchain, if a wallet is restored from backup, even in
case of rescan, funds may be loss due to the look-ahead
buffer not being incremented and so restored wallet not detecting
onchain out-of-range address as derived from its seed.
This scenario is theoretically unavoidable due to the requirement
of the keypool to have a max size. However, given the default
keypool size, this is unlikely. Document better keypool size
implications to avoid user setting a too low value.
While reviewing #17681, it took me a while to figure out the safety implications of keypool, I find it would be better to document this a bit farther to avoid users shooting themselves in the foot. For further context & discussion, see https://github.com/bitcoin/bitcoin/pull/17681#issuecomment-563613452
ACKs for top commit:
ryanofsky:
Code review ACK f41d58966995fe69df433fa684117fae74a56e66. Just "Warning:" prefix added since the last review
jonatack:
ACK f41d58966995fe69df433fa684117fae74a56e66 code review and build/test. The added `Warning:` since last review is a good addition.
Tree-SHA512: d3d0ee88fcdfc5c8841a2bd4bada0e4eeb412a0dce5054e5fb023643c2fa57206a0f3efb06890c245528dc4431413ed2fd5645b9319d26245d044c490b7f0db0
* block_connected: don't serialize block hash twice
In the validation:block_connected tracepoint, we call block->GetHash(),
which ends up calling CBlockHeader::GetHash(), executing around 8000
serialization instructions. We don't need to do this extra work, because
block->GetHash() is already called further up in the function. Let's
save that value as a local variable and re-use it in our tracepoint so
there is no unnecessary tracepoint overhead.
Signed-off-by: William Casarin <jb55@jb55.com>
* ConnectBlock: re-use hash on budget start
Signed-off-by: William Casarin <jb55@jb55.com>
Co-authored-by: William Casarin <jb55@jb55.com>
* refactor: make ThreadOpenMasternodeConnections much more readable, using lambdas!
* refactor: use std::chrono::ms more clearly
* fix log
* drop unneeded line
Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
* style: fix whitespace
* Apply suggestions from code review
Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
* tests: extend "age" period in `feature_llmq_connections.py`
see `NOTE`
* tests: sleep more in `wait_until` by default
Avoid overloading rpc with 20+ requests per second, 2 should be enough.
* tests: various fixes in `activate_dip0024`
- lower batch size
- no fast mode
- disable spork17 while mining
- bump mocktime on every generate call
* tests: bump mocktime on generate in `activate_dip8`
* tests: fix `reindex` option in `restart_mn`
Make sure nodes actually finished reindexing before moving any further.
* tests: trigger recovery threads and wait on mn restarts
* tests: sync blocks in `wait_for_quorum_data`
* tests: bump disconnect timeouts in `p2p_invalid_messages.py`
1 is too low for busy nodes
* tests: Wait for addrv2 processing before bumping mocktime in p2p_addrv2_relay.py
* tests: use `timeout_scale` option in `get_recovered_sig` and `isolate_node`
* tests: fix `wait_for...`s
* tests: fix `close_mn_port` banning test
* Bump MASTERNODE_SYNC_RESET_SECONDS to 900
This helps to avoid issues with 10m+ bump_mocktime on isolated nodes in feature_llmq_is_retroactive.py and feature_llmq_simplepose.py.
* style: fix extra whitespace
Co-authored-by: PastaPastaPasta <6443210+PastaPastaPasta@users.noreply.github.com>
It's incorrect to convert between different enum classes using
initialisation.
However, it's OK to convert between different enum classes using the
same underlying type using static_cast.
Signed-off-by: Oleg Girko <ol@infoserver.lv>
Signed-off-by: Oleg Girko <ol@infoserver.lv>
Co-authored-by: Oleg Girko <ol@infoserver.lv>
fac2fc4dd8a28b99e17c57e4ab6580a3231f1d0a test: Increase debugging to hunt down mempool_reorg intermittent failure (MarcoFalke)
Pull request description:
Top commit has no ACKs.
Tree-SHA512: 4094b44afaa623e58b69f8d0332e60f0150b9ae2fd8bb265210d85546d887672ab8a3435cd9b086be14f69ab5b17e0f9fae06bd8aec1e7947ca766dd72b577c4
fae98668d150bae7a68167749ae134894cb1140e test: Fix intermittent error in mempool_reorg (MarcoFalke)
Pull request description:
Example: https://travis-ci.org/github/bitcoin/bitcoin/jobs/677689899#L4717
Also speed up tx relay and fix two pep8 errors while touching the file anyway.
ACKs for top commit:
vasild:
utACK fae9866
Tree-SHA512: 23a7894e71ad0e1a59c74c73643708fca21b505fa4e980038d554294063fd63c396669eefb233ffdffb0083968e51b702c643cb449df8f656dd8345a20f33907
fa192952507dbe5f405abffce38b3556923ba271 test: Bump timeouts to avoid valgrind failures (MarcoFalke)
Pull request description:
This should fix ci timeout issues such as:
* https://travis-ci.org/github/bitcoin/bitcoin/jobs/661946972#L3109
* https://travis-ci.org/github/bitcoin/bitcoin/jobs/662521570#L4922
ACKs for top commit:
practicalswift:
ACK fa192952507dbe5f405abffce38b3556923ba271
Tree-SHA512: 150f804957575033a83fd47c68fd6adff2c11b110ec5803bd77f121256349805b595c39a3a5047738ec538d082ee38cebbcb6792c787ef22f56b8dd0d9618c1f
4c524f0aad11b44baa56d2b2e432bbddffff74c2 Bugfix: GUI: Hide the HD/encrypt icons earlier so they get re-shown if another wallet is open (Luke Dashjr)
Pull request description:
To reproduce bug, open 2 wallets, and close 1. You end up left without the HD/encrypt icons, despite having a wallet open still.
This works because the icons are re-shown after we remove the current wallet (if there's another wallet still open).
ACKs for top commit:
promag:
Tested ACK 4c524f0aad11b44baa56d2b2e432bbddffff74c2.
jonasschnelli:
utACK 4c524f0aad11b44baa56d2b2e432bbddffff74c2
hebasto:
ACK 4c524f0aad11b44baa56d2b2e432bbddffff74c2, tested on Linux Mint 19.3.
Tree-SHA512: 4ef1bd4a0ae2f20ace9d02bc5d778640c11e46a86f30b762f8502e577f85114f0644d51a70cfbc4c23b51869c3caf20e94548aa64f51fdb85aea5f194a23fca6
486f51099ff4e68b67c5bb7ea428c56f3ea1bd55 gui: hide HD & encryption icons when no wallet loaded (Harris)
Pull request description:
This PR takes care of removing (hiding) the HD wallet and encryption icons when no wallet is loaded.
Fixes#17927
ACKs for top commit:
Sjors:
ACK 486f51099ff4e68b67c5bb7ea428c56f3ea1bd55
theStack:
ACK 486f51099f
fanquake:
ACK 486f51099ff4e68b67c5bb7ea428c56f3ea1bd55 - tested that this fixes#17927. Thanks for following up so quick.
emilengler:
ACK 486f510
Tree-SHA512: 6e3e5305a9eefe1692614097c05393aa0dffd561c89cefb40d501e70a8102eafcadfbc1c86a35c0b256b0f94f41598545d7a043954d6b9669c169d31d95aaf24
44f15cfdcfc64d5a0c36fded39e4aef49415b11b gui: renamed 'debug window' to 'node window' (Zero)
Pull request description:
**Edit**: I have now limited the change in this PR to only renaming the window title from `Debug Window` to `Node Window`. Check [this comment](https://github.com/bitcoin/bitcoin/pull/17096#issuecomment-542837511) for more details.
This PR is in response to #17082, which aims to rename the `Debug window` title to a more user friendly term; `Node window`.
Closes#17082
ACKs for top commit:
hebasto:
ACK 44f15cfdcfc64d5a0c36fded39e4aef49415b11b, tested on Linux Mint 19.3:
theStack:
ACK 44f15cfdcf, tested on Linux (Lubuntu 16.04):
Tree-SHA512: 9fc73f2e67badb38525c550ce4c313288858b3fde30ef17fee85230be5bf31cf94408c699265b5e1256dfed60f8d04f48927d9b2831ba9f25498b98e6fa7180f
2d23082cbe4641175d752a5969f67cdadf1afcea bump test timeouts so that functional tests run in valgrind (Micky Yun Chan)
Pull request description:
ci/tests: Bump timeouts so all functional tests run on travis in valgrind #17763
Top commit has no ACKs.
Tree-SHA512: 5a8c6e2ea02b715facfcb58c761577be15ae58c45a61654beb98c2c2653361196c2eec521bcae4a9a1bab8e409d6807de771ef4c46d3d05996ae47a22d499d54
2525c096b002a89d4c561e1474800496ad8ebd7e build: remove configure checks for win libraries we don't link against (fanquake)
Pull request description:
While cross compiling, `HOST=x86_64-w64-mingw32`, none of these libs actually seem to be passed to the linker. i.e tailing a build with `make -j5 V=1 | rg -i 'mingwthrd|winspool|rpcrt4|crypt32'`.
I'm not 100% sure about `crypt32`, even though the majority of our Windows cryptography usage, i.e [`CryptAcquireContextW`](https://docs.microsoft.com/en-us/windows/win32/api/wincrypt/nf-wincrypt-cryptacquirecontextw) or [`CryptGenRandom`](https://docs.microsoft.com/en-us/windows/win32/api/wincrypt/nf-wincrypt-cryptgenrandom) is provided by `advapi32`.
Note that `rpcrt4` and `mingwthrd` are already missing from the MSVC build, so we can sync the remainder once it's clear what's actually needed. Hopefully sipsorcery can add some MSVC insight.
ACKs for top commit:
practicalswift:
ACK 2525c096b002a89d4c561e1474800496ad8ebd7e -- diff looks correct
sipsorcery:
ACK 2525c096b002a89d4c561e1474800496ad8ebd7e.
Tree-SHA512: c756618f85ce2ab1e14e5514dbdc490d94c1c6dfd7a3e3d3b16344ae302fb789585dd10b5c2d784f961f3115bec1d914615051b3184bea00dfbcc3c23884ab4a
c491368d8cfddf3a5b6d574f10ed67492fcecbed scripts: add MACHO dylib checking to symbol-check.py (fanquake)
76bf97213f4b153dd3ccf1314088a73c4804601d scripts: fix check-symbols & check-security argument passing (fanquake)
Pull request description:
Based on #17857.
This adds dynamic library checks for MACHO executables to symbol-check.py. The script has been modified to function more like `security-check.py`. The error output is now also slightly different. i.e:
```bash
# Linux x86
bitcoin-cli: symbol operator new[](unsigned long) from unsupported version GLIBCXX_3.4
bitcoin-cli: export of symbol vtable for std::basic_ios<char, std::char_traits<char> > not allowed
bitcoin-cli: NEEDED library libstdc++.so.6 is not allowed
bitcoin-cli: failed IMPORTED_SYMBOLS EXPORTED_SYMBOLS LIBRARY_DEPENDENCIES
# RISCV (skips exported symbols checks)
bitcoin-tx: symbol operator new[](unsigned long) from unsupported version GLIBCXX_3.4
bitcoin-tx: NEEDED library libstdc++.so.6 is not allowed
bitcoin-tx: failed IMPORTED_SYMBOLS LIBRARY_DEPENDENCIES
# macOS
Checking macOS dynamic libraries...
libboost_filesystem.dylib is not in ALLOWED_LIBRARIES!
bitcoind: failed DYNAMIC_LIBRARIES
```
Compared to `v0.19.0.1` the macOS allowed dylibs has been slimmed down somewhat:
```diff
src/qt/bitcoin-qt:
/usr/lib/libSystem.B.dylib
-/System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration
/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
-/System/Library/Frameworks/Security.framework/Versions/A/Security
-/System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
/System/Library/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics
-/System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
-/System/Library/Frameworks/AGL.framework/Versions/A/AGL
/System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
/usr/lib/libc++.1.dylib
-/System/Library/Frameworks/CFNetwork.framework/Versions/A/CFNetwork
/System/Library/Frameworks/CoreText.framework/Versions/A/CoreText
/System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
/usr/lib/libobjc.A.dylib
```
ACKs for top commit:
laanwj:
ACK c491368d8cfddf3a5b6d574f10ed67492fcecbed
Tree-SHA512: f8624e4964e80b3e0d34e8d3cc33f3107938f3ef7a01c07828f09b902b5ea31a53c50f9be03576e1896ed832cf2c399e03a7943a4f537a1e1c705f3804aed979
faec689bed7a5b66e2a7675853d10205b933cec8 txmempool: Make entry time type-safe (std::chrono) (MarcoFalke)
faaa1f01daba94b021ca77515266a16d27f0364e util: Add count_seconds time helper (MarcoFalke)
1111170f2f0141084b5b4ed565b2f07eba48599a test: mempool entry time is persisted (MarcoFalke)
Pull request description:
This changes the type of the entry time of txs into the mempool from `int64_t` to `std::chrono::seconds`.
The benefits:
* Documents the type for developers
* Type violations result in compile errors
* After compilation, the two are equivalent (at no run time cost)
ACKs for top commit:
ajtowns:
utACK faec689bed7a5b66e2a7675853d10205b933cec8
laanwj:
ACK faec689bed7a5b66e2a7675853d10205b933cec8
Tree-SHA512: d958e058755d1a1d54cef536a8b30a11cc502b7df0d6ecf84a0ab1d38bc8105a67668a99cd5087a444f6de2421238111c5fca133cdf8e2e2273cb12cb6957845
