Messages in this thread | | | Date | Wed, 24 Apr 2019 14:52:50 -0700 | From | Davidlohr Bueso <> | Subject | Re: Strange issues with epoll since 5.0 |
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On Wed, 24 Apr 2019, Davidlohr Bueso wrote:
>On Wed, 24 Apr 2019, Eric Wong wrote: > >>Omar Kilani <omar.kilani@gmail.com> wrote: >>>Hi there, >>> >>>I???m still trying to piece together a reproducible test that triggers >>>this, but I wanted to post in case someone goes ???hmmm... change X >>>might have done this???. >> >>Maybe Davidlohr knows, since he's responsible for most of the >>epoll changes in 5.0. > >Not really, I have not been made aware of any issues until now. > >> >>>Basically, something???s broken (or at least, has changed enough to >>>cause problems in user space) in epoll since 5.0. It???s still broken in >>>5.1-rc5. >>> >>>It doesn???t happen 100% of the time. It???s sort of hard to pin down but >>>I???ve observed the following: >>> >>>* nginx not accepting connections under load >>>* A java app which uses netty / NIO having strange writability >>>semantics on channels, which confuses netty / java enough to not >>>properly flush written data on the socket.
Off the top of my head, could the following be responsible?
c5a282e9635 (fs/epoll: reduce the scope of wq lock in epoll_wait())
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