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FFI: fix deadlock in hyper_executor::poll_next #3370

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merged 1 commit into from
Oct 23, 2023

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jsha
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@jsha jsha commented Oct 23, 2023

poll_next locks the driver, and also calls drain_queue while holding that lock. Since drain_queue locks the driver too, that results in a deadlock.

To fix, unlock the driver before calling drain_queue.

Fixes #3369.

@seanmonstar
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The fix looks great, thanks! Seems CI is grumpy about a missing comma, of course.

poll_next locks the driver, and also calls drain_queue while holding
that lock. Since drain_queue locks the driver too, that results in a
deadlock.

To fix, unlock the driver before calling drain_queue.
src/ffi/task.rs Show resolved Hide resolved
@seanmonstar seanmonstar merged commit 0c7d03e into hyperium:master Oct 23, 2023
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@jsha jsha deleted the unlock-deadlock branch October 23, 2023 19:59
0xE282B0 pushed a commit to 0xE282B0/hyper that referenced this pull request Jan 12, 2024
poll_next locks the driver, and also calls drain_queue while holding
that lock. Since drain_queue locks the driver too, that results in a
deadlock.

To fix, unlock the driver before calling drain_queue.

Closes hyperium#3369
0xE282B0 pushed a commit to 0xE282B0/hyper that referenced this pull request Jan 16, 2024
poll_next locks the driver, and also calls drain_queue while holding
that lock. Since drain_queue locks the driver too, that results in a
deadlock.

To fix, unlock the driver before calling drain_queue.

Closes hyperium#3369

Signed-off-by: Sven Pfennig <[email protected]>
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C API deadlock in hyper_executor::poll_next
3 participants