Event::set(): supplied resource is not a valid

[DangerLifter]

There is a heavy script which is running 24x7. Before it worked on php5.6 + libevent + php libevent + react. After update to php 7.1 + libevent + php event (React\EventLoop\ExtEventLoop) + react I got periodical crashes with stack below. I am trying to debug issue, but it is difficult cause issue happens relatively rarely. Any help or ideas would be great.

> [2017-12-11 13:45:47] prod.ALERT: ErrorException: Event::set(): supplied resource is not a valid Socket resource in /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php:264
> Stack trace:
> #0 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(2, 'Event::set(): s...', '/home/projects/...', 264, Array)
> #1 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(264): Event->set(Object(EventBase), Resource id #118542, 20, Object(Closure))
> #2 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(96): React\EventLoop\ExtEventLoop->unsubscribeStreamEvent(Resource id #118542, 2)
> #3 /home/projects/application/vendor/react/stream/src/DuplexResourceStream.php(105): React\EventLoop\ExtEventLoop->removeReadStream(Resource id #118542)
> #4 /home/projects/application/vendor/react/stream/src/DuplexResourceStream.php(139): React\Stream\DuplexResourceStream->pause()
> #5 /home/projects/application/vendor/react/socket/src/Connection.php(116): React\Stream\DuplexResourceStream->close()
> #6 /home/projects/application/vendor/react/http-client/src/Request.php(218): React\Socket\Connection->close()
> #7 /home/projects/application/vendor/react/http-client/src/Request.php(205): React\HttpClient\Request->close()
> #8 /home/projects/application/vendor/react/http-client/src/Request.php(178): React\HttpClient\Request->closeError(Object(RuntimeException))
> #9 /home/projects/application/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(123): React\HttpClient\Request->handleEnd()
> #10 /home/projects/application/vendor/react/stream/src/Util.php(71): Evenement\EventEmitter->emit('end', Array)
> #11 /home/projects/application/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(123): React\Stream\Util::React\Stream\{closure}()
> #12 /home/projects/application/vendor/react/stream/src/DuplexResourceStream.php(196): Evenement\EventEmitter->emit('end')
> #13 [internal function]: React\Stream\DuplexResourceStream->handleData(Resource id #118542)
> #14 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(299): call_user_func(Array, Resource id #118542)
> #15 [internal function]: React\EventLoop\ExtEventLoop->React\EventLoop\{closure}(Resource id #118542, 6, NULL)
> #16 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(182): EventBase->loop(3)
> #17 /home/projects/application/library/Main.php(163): React\EventLoop\ExtEventLoop->run()
> 
> Next Exception: Expected either valid PHP stream or valid PHP socket resource in /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php:264
> Stack trace:
> #0 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(264): Event->set(Object(EventBase), Resource id #118542, 20, Object(Closure))
> #1 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(96): React\EventLoop\ExtEventLoop->unsubscribeStreamEvent(Resource id #118542, 2)
> #2 /home/projects/application/vendor/react/stream/src/DuplexResourceStream.php(105): React\EventLoop\ExtEventLoop->removeReadStream(Resource id #118542)
> #3 /home/projects/application/vendor/react/stream/src/DuplexResourceStream.php(139): React\Stream\DuplexResourceStream->pause()
> #4 /home/projects/application/vendor/react/socket/src/Connection.php(116): React\Stream\DuplexResourceStream->close()
> #5 /home/projects/application/vendor/react/http-client/src/Request.php(218): React\Socket\Connection->close()
> #6 /home/projects/application/vendor/react/http-client/src/Request.php(205): React\HttpClient\Request->close()
> #7 /home/projects/application/vendor/react/http-client/src/Request.php(178): React\HttpClient\Request->closeError(Object(RuntimeException))
> #8 /home/projects/application/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(123): React\HttpClient\Request->handleEnd()
> #9 /home/projects/application/vendor/react/stream/src/Util.php(71): Evenement\EventEmitter->emit('end', Array)
> #10 /home/projects/application/vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php(123): React\Stream\Util::React\Stream\{closure}()
> #11 /home/projects/application/vendor/react/stream/src/DuplexResourceStream.php(196): Evenement\EventEmitter->emit('end')
> #12 [internal function]: React\Stream\DuplexResourceStream->handleData(Resource id #118542)
> #13 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(299): call_user_func(Array, Resource id #118542)
> #14 [internal function]: React\EventLoop\ExtEventLoop->React\EventLoop\{closure}(Resource id #118542, 6, NULL)
> #15 /home/projects/application/vendor/react/event-loop/src/ExtEventLoop.php(182): EventBase->loop(3)
> #16 /home/projects/application/library/Main.php(163): React\EventLoop\ExtEventLoop->run()
> 

[WyriHaximus]

@DangerLifter We're looking into this issue, can you show the output of composer show | grep react?

[clue]

Thank you! We have debugged this problem and have a fairly good understanding of what is going on now. I will try to file a test case and fix for this later today. As a temporary workaround, can you try pinning react/stream to v0.7.4 to see if the problem goes away?

[DangerLifter]

In case if usage react/event-loop dev-master:

Symfony\Component\Debug\Exception\FatalThrowableError: Call to private method React\EventLoop\ExtEventLoop::removeStream() from context 'React\Stream\DuplexResourceStream' in /var/www/projects/DomainScrapperUpd/vendor/react/stream/src/DuplexResourceStream.php:134
Stack trace:
#0 /var/www/projects/DomainScrapperUpd/vendor/react/stream/src/DuplexResourceStream.php(190): React\Stream\DuplexResourceStream->close()

[clue]

Thank you for your patience! We've just fixed the root cause with reactphp/socket#141, so updating to react/socket v0.8.7 should fix this issue

Please let us know if this problem persists and we're happy to look into this again 👍