Fix race condition in Function::optimized_graph(). #27012
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The current logic is buggy, and will fail in the following situation: Thread A: check optimized_graph_, it is empty. Thread A: claim the mutex in order to initialize optimized_graph_. Thread A: copy graph_ into optimized_graph_. Thread A: start running optimizations on optimized_graph_. Thread B: check optimized_graph_, it is not empty. Thread B: start using optimized_graph_. BUG: Thread B is using the graph while it's still being mutated by Thread A. [ghstack-poisoned]
ZolotukhinM
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Sep 28, 2019
The current logic is buggy, and will fail in the following situation: Thread A: check optimized_graph_, it is empty. Thread A: claim the mutex in order to initialize optimized_graph_. Thread A: copy graph_ into optimized_graph_. Thread A: start running optimizations on optimized_graph_. Thread B: check optimized_graph_, it is not empty. Thread B: start using optimized_graph_. BUG: Thread B is using the graph while it's still being mutated by Thread A. ghstack-source-id: a8bb36e Pull Request resolved: #27012
wanchaol
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Sep 28, 2019
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@ZolotukhinM merged this pull request in 310ebb4. |
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Pull Request for v1.3.0: #27323 |
pdlive215
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Nov 27, 2019
Summary: Pull Request resolved: pytorch#27012 The current logic is buggy, and will fail in the following situation: Thread A: check optimized_graph_, it is empty. Thread A: claim the mutex in order to initialize optimized_graph_. Thread A: copy graph_ into optimized_graph_. Thread A: start running optimizations on optimized_graph_. Thread B: check optimized_graph_, it is not empty. Thread B: start using optimized_graph_. BUG: Thread B is using the graph while it's still being mutated by Thread A. Test Plan: Imported from OSS Differential Revision: D17649149 Pulled By: ZolotukhinM fbshipit-source-id: ab82a4e76003b88733d219ecd47a42d38be2269c
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Stack from ghstack:
The current logic is buggy, and will fail in the following situation:
Thread A: check optimized_graph_, it is empty.
Thread A: claim the mutex in order to initialize optimized_graph_.
Thread A: copy graph_ into optimized_graph_.
Thread A: start running optimizations on optimized_graph_.
Thread B: check optimized_graph_, it is not empty.
Thread B: start using optimized_graph_.
BUG: Thread B is using the graph while it's still being mutated by
Thread A.
Differential Revision: D17649149