[Consensus] Add locking on the chain index vector.#950
Merged
codeofalltrades merged 1 commit intoVeil-Project:masterfrom May 26, 2021
Merged
[Consensus] Add locking on the chain index vector.#950codeofalltrades merged 1 commit intoVeil-Project:masterfrom
codeofalltrades merged 1 commit intoVeil-Project:masterfrom
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This alleviates a data race reported by tsan (concurrent access to size(), operator[], and resize()).
CaveSpectre11
added
Component: Consensus
Collaborator
|
When does cs_vchain get unlocked? |
Collaborator
Author
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When the lock object is destroyed, when it goes out of scope. |
WetOne
approved these changes
May 24, 2021
Collaborator
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utACK 3cf8acf |
codeofalltrades
added
Code Review: Passed
Tag: Waiting For QA
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Problem
tsan identified a data race on CChain, particularly concurrent access to the underlying vector's
operator[],size, andresizemember functions.Solution
Create a new lock
cs_vchainand markvchainas guarded by it, and ensure that the lock is taken prior to any use.For the
operator==member function, grab both the locks in a prescribed order to avoid a deadlock.Tested
Configured with --with-sanitizers=tsan, built with clang, run on regtest with 2 SHA mining threads enabled.