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Merge #12367: Fix two fast-shutdown bugs

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dd2de47 Fix fast-shutdown crash if genesis block was not loaded (Matt Corallo)
1c9394a Fix fast-shutdown hang on ThreadImport+GenesisWait (Matt Corallo)

Pull request description:

  The second commit is a much simpler alternative fix for the issue fixed in #12349. To test I made ShutdownRequested() always StartShutdown() after a certain number of calls, which turned up one other hang, fixed in the first commit.

Tree-SHA512: 86bde6ac4b8b4e2cb99fff87dafeed02c0d9514acee6d94455637fb2da9ffc274b5ad31b0a6b9f5bd7b700ae35395f28ddb14ffc65ddda3619aa28df28a5607d
This commit is contained in:
Wladimir J. van der Laan 2018-02-08 08:40:55 +01:00
commit 7217ea2cc8
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GPG key ID: 1E4AED62986CD25D
2 changed files with 16 additions and 5 deletions
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11
src/init.cpp
View file

@ -1645,12 +1645,19 @@ bool AppInitMain()
// Wait for genesis block to be processed
{
WaitableLock lock(cs_GenesisWait);
while (!fHaveGenesis) {
condvar_GenesisWait.wait(lock);
// We previously could hang here if StartShutdown() is called prior to
// ThreadImport getting started, so instead we just wait on a timer to
// check ShutdownRequested() regularly.
while (!fHaveGenesis && !ShutdownRequested()) {
condvar_GenesisWait.wait_for(lock, std::chrono::milliseconds(500));
}
uiInterface.NotifyBlockTip.disconnect(BlockNotifyGenesisWait);
}
if (ShutdownRequested()) {
return false;
}
// ********************************************************* Step 11: start node
int chain_active_height;

10
src/validation.cpp
View file

@ -2581,9 +2581,6 @@ bool CChainState::ActivateBestChain(CValidationState &state, const CChainParams&
SyncWithValidationInterfaceQueue();
}
if (ShutdownRequested())
break;
const CBlockIndex *pindexFork;
bool fInitialDownload;
{
@ -2630,6 +2627,13 @@ bool CChainState::ActivateBestChain(CValidationState &state, const CChainParams&
}
if (nStopAtHeight && pindexNewTip && pindexNewTip->nHeight >= nStopAtHeight) StartShutdown();
// We check shutdown only after giving ActivateBestChainStep a chance to run once so that we
// never shutdown before connecting the genesis block during LoadChainTip(). Previously this
// caused an assert() failure during shutdown in such cases as the UTXO DB flushing checks
// that the best block hash is non-null.
if (ShutdownRequested())
break;
} while (pindexNewTip != pindexMostWork);
CheckBlockIndex(chainparams.GetConsensus());