Swap read on timerfd/eventfd to poll to avoid Kernel 6.15.4 bug #171
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Owner
Author
|
cc @pluiedev |
This commit changes our operations on timerfd and eventfd from using read to using poll. This is a workaround for a bug in Kernel 6.15.4 that causes read operations on these file descriptors to hang indefinitely. A poll is equivalent to what we're trying to achieve here and is equivalent to epoll because epoll is already polling and `read` was just a wrapper that subsequently called `read` anyways. Prior to this commit, tests would hang on 6.15.4, now they pass.
mitchellh
force-pushed
the
push-uwprmqnrrvxz
branch
from
d54278d to
c6d1f45
Compare
Sythivo
referenced
this pull request
in Scythe-Technology/libxev
Jul 3, 2025
This commit changes our operations on timerfd and eventfd from using read to using poll. This is a workaround for a bug in Kernel 6.15.4 that causes read operations on these file descriptors to hang indefinitely. A poll is equivalent to what we're trying to achieve here and is equivalent to epoll because epoll is already polling and `read` was just a wrapper that subsequently called `read` anyways. Prior to this commit, tests would hang on 6.15.4, now they pass.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This commit changes our operations on timerfd and eventfd from using read to using poll. This is a workaround for a bug in Kernel 6.15.4 that causes read operations on these file descriptors to hang indefinitely.
A poll is equivalent to what we're trying to achieve here and is equivalent to epoll because epoll is already polling and
readwas just a wrapper that subsequently calledreadanyways.Prior to this commit, tests would hang on 6.15.4, now they pass.