[Wallet] Lock cs_wallet in additional places. #949
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- Declare CWallet::KeepKey as requiring the lock, and take it before all calls. This eliminates a tsan data race. Also, fields within CReserveKey may similarly contend during mining, declare that they are guarded by the same lock. - Add other cs_wallet uses per lock annotations. This eliminates some clang warnings: AddKeyPubKey requires holding mutex 'pwalletParent->cs_wallet' exclusively
CaveSpectre11
added
Component: Core App
codeofalltrades
added
Code Review: Passed
and removed
Tag: Waiting For Code Review
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Problem
tsan identifies a data race within WalletBatch, commonly between KeepKey and AddToWallet.
Solution
Declare CWallet::KeepKey as requiring
cs_wallet, and take it before all calls as prescribed by clang. (This moved the tsan data race to the nearby fields of CReserveKey, which was mitigated by including their access within the lock.)Add another cs_wallet use per clang warning: AddKeyPubKey requires holding mutex 'pwalletParent->cs_wallet' exclusively.
Tested
Configured with --with-sanitizers=thread, built with clang, and run on regtest. tsan warnings for this area no longer appear.