62d50ef308 Add LOCKS_EXCLUDED(cs_main) to LimitValidationInterfaceQueue(...) which does AssertLockNotHeld(cs_main) (practicalswift)
Pull request description:
This PR adds compile-time checking for negative locking requirements that follow from the run-time locking requirement `AssertLockNotHeld(cs_main)` in `LimitValidationInterfaceQueue(...)`.
Changes:
* Add `LOCKS_EXCLUDED(cs_main)` to `LimitValidationInterfaceQueue(...)` which does `AssertLockNotHeld(cs_main)`
* Add `LOCKS_EXCLUDED(cs_main)` to `CChainState::ActivateBestChain(…)`, `CChainState:: InvalidateBlock(…)` and `CChainState::RewindBlockIndex(…)` which all call `LimitValidationInterfaceQueue(...)` which does `AssertLockNotHeld(cs_main)`
* Add `LOCKS_EXCLUDED(cs_main)` to `InvalidateBlock(…)` which calls `CChainState::InvalidateBlock(...)` which in turn calls `LimitValidationInterfaceQueue(...)` which does `AssertLockNotHeld(cs_main)`
* Add `LOCKS_EXCLUDED(cs_main)` to `RewindBlockIndex(…)` which calls `CChainState::RewindBlockIndex(...)` which in turn calls `LimitValidationInterfaceQueue(...)` which does `AssertLockNotHeld(cs_main)`
ACKs for commit 62d50e:
MarcoFalke:
utACK 62d50ef308
Tree-SHA512: 73d092ccd08c851ae3c5d60370c369fc030c5793f5507e2faccb6f91c851ddc0ce059fbea3899f2856330d7a8c78f2ac6a2988e8268b03154f946be9e60e3be1
Add LOCKS_EXCLUDED(cs_main) to functions calling LimitValidationInterfaceQueue(...) which does AssertLockNotHeld(cs_main)
Add LOCKS_EXCLUDED(cs_main) to functions calling CChainState::InvalidateBlock(...) which calls LimitValidationInterfaceQueue(...) which in turn does AssertLockNotHeld(cs_main)
Add LOCKS_EXCLUDED(cs_main) to functions calling CChainState::RewindBlockIndex(...) which calls LimitValidationInterfaceQueue(...) which in turn does AssertLockNotHeld(cs_main)
486c1eea86 refactoring: remove unused chainActive (James O'Beirne)
631940aab2 scripted-diff: replace chainActive -> ::ChainActive() (James O'Beirne)
a3a609079c refactoring: introduce unused ChainActive() (James O'Beirne)
1b6e6fcfd2 rename: CChainState.chainActive -> m_chain (James O'Beirne)
Pull request description:
This is part of the assumeutxo project:
Parent PR: #15606
Issue: #15605
Specification: https://github.com/jamesob/assumeutxo-docs/tree/2019-04-proposal/proposal
---
This change refactors the `chainActive` reference into a `::ChainActive()` call. It also distinguishes `CChainState`'s `CChain` data member as `m_chain` instead of the current `chainActive`, which makes it easily confused with the global data.
The active chain must be obtained via function because its reference will be swapped at some point during runtime after loading a UTXO snapshot.
This change, though lengthy, should be pretty easy to review since most of it is contained within a scripted-diff. Once merged, the parent PR should be easier to review.
ACKs for commit 486c1e:
Sjors:
utACK 486c1ee
promag:
utACK 486c1ee.
practicalswift:
utACK 486c1eea86
Tree-SHA512: 06ed8f9e77f2d25fc9bea0ba86436d80dbbce90a1e8be23e37ec4eeb26060483e60b4a5c4fba679cb1867f61e3921c24abeb9cabdfb4d0a9b1c4ddd77b17456a
0ff1c2a838 Separate reason for premature spends (coinbase/locktime) (Suhas Daftuar)
54470e767b Assert validation reasons are contextually correct (Suhas Daftuar)
2120c31521 [refactor] Update some comments in validation.cpp as we arent doing DoS there (Matt Corallo)
12dbdd7a41 [refactor] Drop unused state.DoS(), state.GetDoS(), state.CorruptionPossible() (Matt Corallo)
aa502b88d1 scripted-diff: Remove DoS calls to CValidationState (Matt Corallo)
7721ad64f4 [refactor] Prep for scripted-diff by removing some \ns which annoy sed. (Matt Corallo)
5e78c5734b Allow use of state.Invalid() for all reasons (Matt Corallo)
6b34bc6b6f Fix handling of invalid headers (Suhas Daftuar)
ef54b486d5 [refactor] Use Reasons directly instead of DoS codes (Matt Corallo)
9ab2a0412e CorruptionPossible -> BLOCK_MUTATED (Matt Corallo)
6e55b292b0 CorruptionPossible -> TX_WITNESS_MUTATED (Matt Corallo)
7df16e70e6 LookupBlockIndex -> CACHED_INVALID (Matt Corallo)
c8b0d22698 [refactor] Drop redundant nDoS, corruptionPossible, SetCorruptionPossible (Matt Corallo)
34477ccd39 [refactor] Add useful-for-dos "reason" field to CValidationState (Matt Corallo)
6a7f8777a0 Ban all peers for all block script failures (Suhas Daftuar)
7b999103e2 Clean up banning levels (Matt Corallo)
b8b4c80146 [refactor] drop IsInvalid(nDoSOut) (Matt Corallo)
8818729013 [refactor] Refactor misbehavior ban decisions to MaybePunishNode() (Matt Corallo)
00e11e61c0 [refactor] rename stateDummy -> orphan_state (Matt Corallo)
f34fa719cf Drop obsolete sigops comment (Matt Corallo)
Pull request description:
This is a rebase of #11639 with some fixes for the last few comments which were not yet addressed.
The original PR text, with some strikethroughs of text that is no longer correct:
> This cleans up an old main-carryover - it made sense that main could decide what DoS scores to assign things because the DoS scores were handled in a different part of main, but now validation is telling net_processing what DoS scores to assign to different things, which is utter nonsense. Instead, we replace CValidationState's nDoS and CorruptionPossible with a general ValidationInvalidReason, which net_processing can handle as it sees fit. I keep the behavior changes here to a minimum, but in the future we can utilize these changes for other smarter behavior, such as disconnecting/preferring to rotate outbound peers based on them providing things which are invalid due to SOFT_FORK because we shouldn't ban for such cases.
>
> This is somewhat complementary with, though obviously conflicts heavily with #11523, which added enums in place of DoS scores, as well as a few other cleanups (which are still relevant).
>
> Compared with previous bans, the following changes are made:
>
> Txn with empty vin/vout or null prevouts move from 10 DoS
> points to 100.
> Loose transactions with a dependency loop now result in a ban
> instead of 10 DoS points.
> ~~BIP68-violation no longer results in a ban as it is SOFT_FORK.~~
> ~~Non-SegWit SigOp violation no longer results in a ban as it
> considers P2SH sigops and is thus SOFT_FORK.~~
> ~~Any script violation in a block no longer results in a ban as
> it may be the result of a SOFT_FORK. This should likely be
> fixed in the future by differentiating between them.~~
> Proof of work failure moves from 50 DoS points to a ban.
> Blocks with timestamps under MTP now result in a ban, blocks
> too far in the future continue to not result in a ban.
> Inclusion of non-final transactions in a block now results in a
> ban instead of 10 DoS points.
Note: The change to ban all peers for consensus violations is actually NOT the change I'd like to make -- I'd prefer to only ban outbound peers in those situations. The current behavior is a bit of a mess, however, and so in the interests of advancing this PR I tried to keep the changes to a minimum. I plan to revisit the behavior in a followup PR.
EDIT: One reviewer suggested I add some additional context for this PR:
> The goal of this work was to make net_processing aware of the actual reasons for validation failures, rather than just deal with opaque numbers instructing it to do something.
>
> In the future, I'd like to make it so that we use more context to decide how to punish a peer. One example is to differentiate inbound and outbound peer misbehaviors. Another potential example is if we'd treat RECENT_CONSENSUS_CHANGE failures differently (ie after the next consensus change is implemented), and perhaps again we'd want to treat some peers differently than others.
ACKs for commit 0ff1c2:
jnewbery:
utACK 0ff1c2a838
ryanofsky:
utACK 0ff1c2a838. Only change is dropping the first commit (f3883a321bf4ab289edcd9754b12cae3a648b175), and dropping the temporary `assert(level == GetDoS())` that was in 35ee77f2832eaffce30042e00785c310c5540cdc (now c8b0d22698)
Tree-SHA512: e915a411100876398af5463d0a885920e44d473467bb6af991ef2e8f2681db6c1209bb60f848bd154be72d460f039b5653df20a6840352c5f7ea5486d9f777a3
Though at the moment ChainActive() simply references `g_chainstate.m_chain`,
doing this change now clears the way for multiple chainstate usage and allows
us to script the diff.
-BEGIN VERIFY SCRIPT-
git grep -l "chainActive" | grep -E '(h|cpp)$' | xargs sed -i '/chainActive =/b; /extern CChain& chainActive/b; s/\(::\)\{0,1\}chainActive/::ChainActive()/g'
-END VERIFY SCRIPT-
This can't be a scripted-diff due to the confusion of the global
chainActive and the CChainState member of the same name.
This specific rename makes the following chainActive -> ::ChainActive() diff
scriptable.
This is a first step towards cleaning up our DoS interface - make
validation return *why* something is invalid, and let net_processing
figure out what that implies in terms of banning/disconnection/etc.
Behavior change: peers will now be banned for providing blocks
with premature coinbase spends.
Co-authored-by: Anthony Towns <aj@erisian.com.au>
Suhas Daftuar <sdaftuar@gmail.com>
Compared with previous bans, the following changes are made:
* Txn with empty vin/vout or null prevouts move from 10 DoS
points to 100.
* Loose transactions with a dependency loop now result in a ban
instead of 10 DoS points.
* Many pre-segwit soft-fork errors now result in a ban.
Note: Transactions that violate soft-fork script flags since P2SH do not generally
result in a ban. Also, banning behavior for invalid blocks is dependent on
whether the node is validating with multiple script check threads, due to a long-
standing bug. That inconsistency is still present after this commit.
* Proof of work failure moves from 50 DoS points to a ban.
* Blocks with timestamps under MTP now result in a ban, blocks
too far in the future continue to *not* result in a ban.
* Inclusion of non-final transactions in a block now results in a
ban instead of 10 DoS points.
Co-authored-by: Anthony Towns <aj@erisian.com.au>
This comment was confusing and incorrect when first added ("invalid rather than
merely non-standard" has the opposite meaning of what is actually the case),
and was also not updated after segwit with the correct variable names.
Delete it since the code reads just fine on its own.
Co-authored by: Anthony Towns <aj@erisian.com.au>
Suhas Daftuar <sdaftuar@gmail.com>
effe81f750 Move g_is_mempool_loaded into CTxMemPool::m_is_loaded (Ben Woosley)
bb8ae2c419 rpc: Expose g_is_mempool_loaded via getmempoolinfo and /rest/mempool/info.json (Ben Woosley)
Pull request description:
And use it to fix a race condition in mempool_persist.py:
https://travis-ci.org/Empact/bitcoin/jobs/487577243
Since e.g. getrawmempool returns errors based on this status, this
enables users to test it for readiness.
Fixes#12863
ACKs for commit effe81:
MarcoFalke:
utACK effe81f750
jnewbery:
utACK effe81f750
Tree-SHA512: 74328b0c17a97efb8a000d4ee49b9a673c2b6dde7ea30c43a6a2eff961a233351c9471f9a42344412135786c02bdf2ee1b2526651bb8fed68bd94d2120c4ef86
This work is prerequisite to attaching thread names to log lines and deadlock
debug utilities. This code allows setting of an "internal" threadname per
thread on platforms where thread_local is available.
This commit also moves RenameThread() out of a more general module and adds a
numeric suffix to disambiguate between threads with the same name. It
explicitly names a few main threads using the new util::ThreadRename().
5c759c73b2 [wallet] Move maxTxFee to wallet (John Newbery)
Pull request description:
Closes#15355
Moves the `-maxtxfee` from the node to the wallet. See discussion in issue for details.
This is a cleanup. There is no change in behaviour.
Completes #15620
ACKs for commit 5c759c:
MarcoFalke:
utACK 5c759c73b2
ryanofsky:
utACK 5c759c73b2. Changes since last review: updated commit message and an error message and method name.
meshcollider:
utACK 5c759c73b2
Tree-SHA512: 2f9b2729da3940a5cda994d3f3bc11ee1a52fcc1c5e9842ea0ea63e4eb0300e8416853046776311298bc449ba07554aa46f0f245ce28598a5b0bd7347c12e752
5d26205272 doc: explain AcceptToMemoryPoolWorker's coins_to_uncache (James O'Beirne)
Pull request description:
I found ATMPW's `coins_to_uncache` a little hard to understand (see #15264). This adds some doc for posterity.
ACKs for commit 5d2620:
jnewbery:
ACK 5d26205272
Tree-SHA512: 088508fa78012fab8680663c4e30f5cee29768416c2ca8b8b2abc29b6ac7067c5a589674f0254474a7ccc95477889d41719760f5796792bf492f51b3dd499c6c
418d3230f8 Resolve the checkpoints <-> validation CD. (251)
Pull request description:
This pull request attempts to resolve the `checkpoints -> validation -> checkpoints` circular dependency.
The circular dependency is resolved by moving the `CheckPoints::GetLastCheckpoint(const CCheckpointData& data)` function to `validation.cpp` where it used exclusively by the private function `ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, const CChainParams& params, const CBlockIndex* pindexPrev, int64_t nAdjustedTime)`.
ACKs for commit 418d32:
promag:
utACK 418d323, only `GetLastCheckpoint` usage is in `validation.cpp` and so makes sense to move it there.
practicalswift:
utACK 418d3230f8
MarcoFalke:
utACK 418d3230f8
sipa:
utACK 418d3230f8
Tree-SHA512: 03c3556bc192e65f5e3fa76fd545d4ee7d63d3fb06b132f7a1fa6131aa21ddd2e5b2d19e2222dfe524f422daaca30efde219bed188db8c74ff4b088876b5bc16
This commit moves the maxtxfee setting to the wallet. There is only
one minor behavior change:
- an error message in feebumper now refers to -maxtxfee instead of
maxTxFee.
4d074e84a2 [build] Move AnalyzePSBT from psbt.cpp to node/psbt.cpp (Russell Yanofsky)
fd509bd1f7 [docs] Document src subdirectories and different libraries (John Newbery)
9eaeb7fb8d [build] Move wallet load functions to wallet/load unit (John Newbery)
91a25d1e71 [build] Add several util units (John Newbery)
99517866b6 [build] Move several units into common libraries (John Newbery)
0509465542 [build] Move rpc rawtransaction util functions to rpc/rawtransaction_util.cpp (John Newbery)
1acc61f874 [build] Move rpc utility methods to rpc/util (John Newbery)
4a75c9d651 [build] Move policy settings to new src/policy/settings unit (John Newbery)
fdf8888b6f [build] Move CheckTransaction from lib_server to lib_consensus (John Newbery)
Pull request description:
This is a move-only commit. No code is changing and the moves can be easily verified with:
```sh
git log -p -n1 --color-moved=dimmed_zebra
```
This commit moves functions and variables that wallet code depends on out of libbitcoin_server.a, so the bitcoin-wallet tool can be built without libbitcoin_server.a in #15639, and attempting to access server state from wallet code will result in link errors instead of silently broken code.
List of moves:
- `CheckTransaction` moves from `consensus/tx_verify.cpp` to `consensus/tx_check.cpp`
- `urlDecode` moves from `httpserver.cpp` to `util/url.cpp`
- `TransactionErrorString` moves from `node/transaction.cpp` to `util/error.cpp`
- `StringForFeeReason` and `FeeModeFromString` move from `policy/fees.cpp` to `util/fees.cpp`
- `incrementalRelayFee` `dustRelayFee` and `nBytesPerSigOp` move from `policy/policy.cpp` to `policy/settings.cpp`
- `SignalsOptInRBF` moves from `policy/rbf.cpp` to `util/rbf.cpp`
- `fIsBareMultisigStd` moves from `validation.cpp` to `policy/settings.cpp`
- `ConstructTransaction` `TxInErrorToJSON` and `SignTransaction` move from `rpc/rawtransaction.cpp` to `rpc/rawtransaction_util.cpp`
- `RPCTypeCheck` `RPCTypeCheckArgument` `RPCTypeCheckObj` `AmountFromValue` `ParseHashV``ParseHashO` `ParseHexV` `ParseHexO` `HelpExampleCli` and `HelpExampleRpc` move from `rpc/server.cpp` to `rpc/util.cpp`
- `AmountHighWarn` and `AmountErrMsg` move from `ui_interface.cpp` to `util/error.cpp`
- `FormatStateMessage` and `strMessageMagic` move from `validation.cpp` to `util/validation.cpp`
- `VerifyWallets` `LoadWallets` `StartWallets` `FlushWallets` `StopWallets` and `UnloadWallets` move from `wallet/init.cpp` to `wallet/node.cpp`
ACKs for commit 4d074e:
jnewbery:
utACK 4d074e84a2 (checked by doing the rebase myself and verifying no difference between my branch and 4d074e84a2)
Tree-SHA512: 5e1604a9fb06475f2b96da0de0baa8330f4dda834dc20a0183ef11e1e4c27631d1d1bbb9abf0054efc03d56945fdf9920f63366b6a4f200f665b742a479ff75c
fae38c3dc6 doc: Fix all typos reported by codespell (MarcoFalke)
fa9058f0ed doc: Add release notes for 15629 (MarcoFalke)
fa4a922d78 qa: Add test for missing testnet section in conf file (MarcoFalke)
dddd6f0f58 init: Throw error when network specific config is ignored (MarcoFalke)
Pull request description:
This should have no effect on mainnet users, but simplifies testing, where config settings are currently ignored with only a warning. Fix this by making it an error.
Issues:
* bitcoin client 0.17.0 ignores wallet's name (file) #14523
* Can't set custom rpcport on testnet #13777
* ...
ACKs for commit fae38c:
Tree-SHA512: 2e209526898eea6e444c803ec2666989cee4ca137492d32984998733c50a70056cb54657df8dc3027a6a0612738a8afce0bc35824b868c5f22281e00e0188530
Adds the following util units and adds them to libbitcoin_util:
- `util/url.cpp` takes `urlDecode` from `httpserver.cpp`
- `util/error.cpp` takes `TransactionErrorString` from
`node/transaction.cpp` and `AmountHighWarn` and `AmountErrMsg` from
`ui_interface.cpp`
- `util/fees.cpp` takes `StringForFeeReason` and `FeeModeFromString` from `policy/fees.cpp`
- `util/rbf.cpp` takes `SignalsOptInRBF` from `policy/rbf.cpp`
- 'util/validation.cpp` takes `FormatStateMessage` and `strMessageMagic` from 'validation.cpp`
This moves the following policy settings functions and globals to a new
src/policy/settings unit in lib_server:
- `incrementalRelayFee`
- `dustRelayFee`
- `nBytesPerSigOp`
- `fIsBareMultisigStd`
These settings are only required by the node and should not be accessed
by other libraries.
CheckTransaction is a context-free function that does not require access
to the blockchain or mempool. Move it from src/consensus/tx_verify in
lib_server to a new unit src/consensus/tx_check in lib_consensus so that
it can be called by non-server libraries.
This commit resolves the checkpoints -> validation -> checkpoints
cirular dependency by moving
`CheckPoints::GetLastCheckpoint(const CCheckpointData& data)` from
`checkpoints.cpp` to `validation.cpp`.
fa5c511a83 refactor: Remove unused function (MarcoFalke)
Pull request description:
Oversight of kallewoof and mine in https://github.com/bitcoin/bitcoin/pull/13541#discussion_r266555476
Tree-SHA512: 2fd3c4ecde5d3c58b113aa58d606976ceb4998358bde0547ead8e83df210722fa9821d2c88b717bdd190ef71593cd9c0154c3a5d3f2ccc3af8cbf6c36aaa6d45
7abd2e697c wallet/rpc: add maxfeerate parameter to testmempoolaccept (Karl-Johan Alm)
6c0a6f73e3 wallet/rpc: add maxfeerate parameter to sendrawtransaction (Karl-Johan Alm)
e5efacb941 test: Refactor vout fetches in rpc_rawtransaction (Karl-Johan Alm)
Pull request description:
This adds a new `maxfeerate` parameter to `sendrawtransaction` which forces the node to reject a transaction whose feerate is above the given fee rate.
This is a safety harness from shooting yourself in the foot and accidentally overpaying fees.
See also #12911.
Tree-SHA512: efa50134a7c17c9330cfdfd48ba400e095c0a419cc45e630618d8b44929c25d780d1bb2710c1fbbb6e687eca373505b0338cdaa7f2ff4ca22636d84c31557a2e
519b0bc5dc Make last disconnected block BLOCK_FAILED_VALID, even when aborted (Pieter Wuille)
8d220417cd Optimization: don't add txn back to mempool after 10 invalidates (Pieter Wuille)
9ce9c37004 Prevent callback overruns in InvalidateBlock and RewindBlockIndex (Pieter Wuille)
9bb32eb571 Release cs_main during InvalidateBlock iterations (Pieter Wuille)
9b1ff5c742 Call InvalidateBlock without cs_main held (Pieter Wuille)
241b2c74ac Make RewindBlockIndex interruptible (Pieter Wuille)
880ce7d46b Call RewindBlockIndex without cs_main held (Pieter Wuille)
436f7d735f Release cs_main during RewindBlockIndex operation (Pieter Wuille)
1d342875c2 Merge the disconnection and erasing loops in RewindBlockIndex (Pieter Wuille)
32b2696ab4 Move erasure of non-active blocks to a separate loop in RewindBlockIndex (Pieter Wuille)
9d6dcc52c6 Abstract EraseBlockData out of RewindBlockIndex (Pieter Wuille)
Pull request description:
This PR makes a number of improvements to the InvalidateBlock (`invalidateblock` RPC) and RewindBlockIndex functions, primarily around breaking up their long-term cs_main holding. In addition:
* They're made safely interruptible (`bitcoind` can be shutdown, and no progress in either will be lost, though if incomplete, `invalidateblock` won't continue after restart and will need to be called again)
* The validation queue is prevented from overflowing (meaning `invalidateblock` on a very old block will not drive bitcoind OOM) (see #14289).
* `invalidateblock` won't bother to move transactions back into the mempool after 10 blocks (optimization).
This is not an optimal solution, as we're relying on the scheduler call sites to make sure the scheduler doesn't overflow. Ideally, the scheduler would guarantee this directly, but that needs a few further changes (moving the signal emissions out of cs_main) to prevent deadlocks.
I have manually tested the `invalidateblock` changes (including interrupting, and running with -checkblockindex and -checkmempool), but haven't tried the rewinding (which is probably becoming increasingly unnecessary, as very few pre-0.13.1 nodes remain that would care to upgrade).
Tree-SHA512: 692e42758bd3d3efc2eb701984a8cb5db25fbeee32e7575df0183a00d0c2c30fdf72ce64c7625c32ad8c8bdc56313da72a7471658faeb0d39eefe39c4b8b8474
04cca33094 Style cleanup. (Jim Posen)
4c01e4e159 flatfile: Unit tests for FlatFileSeq methods. (Jim Posen)
65a489e93d scripted-diff: Rename CBlockDiskPos to FlatFilePos. (Jim Posen)
d6d8a78f26 Move CDiskBlockPos from chain to flatfile. (Jim Posen)
e0380933e3 validation: Refactor file flush logic into FlatFileSeq. (Jim Posen)
992404b31e validation: Refactor block file pre-allocation into FlatFileSeq. (Jim Posen)
e2d2abb99f validation: Refactor OpenDiskFile into method on FlatFileSeq. (Jim Posen)
9183d6ef65 validation: Extract basic block file logic into FlatFileSeq class. (Jim Posen)
62e7addb63 util: Move CheckDiskSpace to util. (Jim Posen)
Pull request description:
This cleans up and refactors block file helpers so that they may be used by the block filter indexer. Per [design discussion](https://github.com/bitcoin/bitcoin/pull/14121#issuecomment-451252591) about storing BIP 157 block filters, it has been suggested that they are stored in the same way as block and undo data. This refactor is sufficient to simplify file operations for this use case, though in the future perhaps more pruning-related logic ought to be moved into the new classes.
The basic abstraction is a `FlatFileSeq` which manages access to a sequence of numbered files into which raw data is written.
Tree-SHA512: b2108756777f2dad8964a1a2ef2764486e708a4a4a8cfac47b5de8bcb0625388964438eb096b10cfd9ea39212c299b5cb32fa943e768db2333cf49ea7def157e
Due to miners inserting garbage into the version numbers, the current
version signalling has become completely useless. This removes the
"unknown block versions" warning which has the tendency to scare
users unnecessarily (and might get them to "update" to something
bad).
It preserves the warning in the logs. Whether this is desirable can
be a point of discussion.
