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Resume one waiter at once in deadlock handler When multiple query loop errors occur in the code, only one waiter should be resumed at a time to avoid waking up multiple waiters at the same time and causing deadlock due to thread grabbing. This fixes the UI failures in #132051 cc `@Zoxc` `@cjgillot` `@nnethercote` `@bjorn3` `@Kobzol` Zulip discussion [here](https://rust-lang.zulipchat.com/#narrow/channel/187679-t-compiler.2Fwg-parallel-rustc/topic/Deadlocks.20and.20Rayon) Edit: We can't reproduce these bugs with the existing test suits, so we keep them until we merge #132051 UPDATES #129912 UPDATES #120757 UPDATES #129911 |
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