diff options
author | Ryan Ofsky <ryan@ofsky.org> | 2022-09-30 08:44:04 -0400 |
---|---|---|
committer | fanquake <fanquake@gmail.com> | 2022-10-11 09:20:07 +0800 |
commit | 5ad82a09b409d416236092062a4201e238dfd68b (patch) | |
tree | 790515bff6294befe622cee8213ef3c7b280a51f /.gitignore | |
parent | 997faf6b6c774dc87ae730f2f08d7f4f08bdfd04 (diff) |
index: Improve BaseIndex::BlockUntilSyncedToCurrentChain reliability
Since commit f08c9fb0c6a799e3cb75ca5f763a746471625beb from PR
https://github.com/bitcoin/bitcoin/pull/21726, index
`BlockUntilSyncedToCurrentChain` behavior has been less reliable, and there has
also been a race condition in the `coinstatsindex_initial_sync` unit test.
It seems better for `BlockUntilSyncedToCurrentChain` to actually wait for the
last connected block to be fully processed, than to be able to return before
prune locks are set, so this switches the order of `m_best_block_index =
block;` and `UpdatePruneLock` statements in `SetBestBlockIndex` to make it more
reliable.
Also since commit f08c9fb0c6a799e3cb75ca5f763a746471625beb, there has been a
race condition in the `coinstatsindex_initial_sync` test. Before that commit,
the atomic index best block pointer `m_best_block_index` was updated as the
last step of `BaseIndex::BlockConnected`, so `BlockUntilSyncedToCurrentChain`
could safely be used in tests to wait for the last `BlockConnected`
notification to be finished before stopping and destroying the index. But
after that commit, calling `BlockUntilSyncedToCurrentChain` is no longer
sufficient, and there is a race between the test shutdown code which destroys
the index object and the new code introduced in that commit calling
`AllowPrune()` and `GetName()` on the index object. Reproducibility
instructions for this are in
https://github.com/bitcoin/bitcoin/issues/25365#issuecomment-1259744133
This commit fixes the `coinstatsindex_initial_sync` race condition, even though
it will require an additional change to silence TSAN false positives,
https://github.com/bitcoin/bitcoin/pull/26188, after it is fixed. So this
partially addresses but does not resolve the bug reporting TSAN errors
https://github.com/bitcoin/bitcoin/issues/25365.
There is no known race condition outside of test code currently, because the
bitcoind `Shutdown` function calls `FlushBackgroundCallbacks` not
`BlockUntilSyncedToCurrentChain` to safely shut down.
Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
Co-authored-by: MacroFake <falke.marco@gmail.com>
Github-Pull: #26215
Rebased-From: 8891949bdcb25093d3a6703ae8228c3c3687d3a4
Diffstat (limited to '.gitignore')
0 files changed, 0 insertions, 0 deletions