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[5.1.0] Deadlock and warnings when Http2 connection breaks #361

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CRC-Mismatch opened this issue Apr 24, 2024 · 1 comment
Closed

[5.1.0] Deadlock and warnings when Http2 connection breaks #361

CRC-Mismatch opened this issue Apr 24, 2024 · 1 comment

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@CRC-Mismatch
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CRC-Mismatch commented Apr 24, 2024 •
edited

For some context, I've developed a Symfony Console command for a data migration task that requires basically just sending POST requests to a predefined endpoint and logging the results of each request - but since it's a mass-import task, we'll be doing around 1M of these POSTs. The command itself uses AMPHP's Pipelines and Workers to easily speed up the process, and inside the custom Task class, I'm using amphp/http-client to do the actual request/response handling.

Now on to the problem itself: It seems that whenever a connection breakage occurs, the affected amp-process subprocess "spits" out some PHP warnings, then deadlocks using 100% of a CPU core. The remaining subprocesses are able to continue the batch just fine, until there's only the tasks that were already assigned to the locked process' workers remaining - then the whole command sits running "idle" until manually interrupted (SignalCancellation seems to do the trick), and only then a really long "Fatal Error" trace gets printed out...

The "initial" PHP warnings:

PHP Warning:  Undefined array key 2033 in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on 
line 1336                                                                                                                                                                                                                          
PHP Warning:  Attempt to read property "responsePending" on null in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on line 1347                                              
PHP Warning:  Attempt to read property "body" on null in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on line 1347                                                         
PHP Warning:  Attempt to read property "trailers" on null in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on line 1347                                                     
PHP Warning:  Undefined array key 2033 in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on line 1336                                                                        
PHP Warning:  Attempt to read property "responsePending" on null in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on line 1347                                              
PHP Warning:  Attempt to read property "body" on null in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on line 1347                                                         
PHP Warning:  Attempt to read property "trailers" on null in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php on line 1347

The traces that only get printed after the Cancellation request:

PHP Fatal error:  Uncaught Amp\Http\Client\SocketException: The HTTP/2 connection from '<redacted>:59720' to '<redacted>:443' closed unexpectedly in /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php:1432
Stack trace:                                                                                                                                                                                                                       
#0 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Internal/Http2ConnectionProcessor.php(1134): Amp\Http\Client\Connection\Internal\Http2ConnectionProcessor->shutdown()                                            
#1 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(425): Amp\Http\Client\Connection\Internal\Http2ConnectionProcessor->runReadFiber()                                                    
#2 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(616): Revolt\EventLoop\Internal\AbstractDriver->invokeMicrotasks()                                                                    
#3 [internal function]: Revolt\EventLoop\Internal\AbstractDriver->Revolt\EventLoop\Internal\{closure}()                                                                                                                            
#4 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/DriverSuspension.php(64): Fiber->resume()                                                                                                                
#5 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(425): Revolt\EventLoop\Internal\DriverSuspension::Revolt\EventLoop\Internal\{closure}()                                               
#6 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(616): Revolt\EventLoop\Internal\AbstractDriver->invokeMicrotasks()                                                                    
#7 [internal function]: Revolt\EventLoop\Internal\AbstractDriver->Revolt\EventLoop\Internal\{closure}()                                                                                                                            
#8 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(498): Fiber->start()                                                                                                                  
#9 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(553): Revolt\EventLoop\Internal\AbstractDriver->invokeCallbacks()                                                                     
#10 [internal function]: Revolt\EventLoop\Internal\AbstractDriver->Revolt\EventLoop\Internal\{closure}()                                                                                                                           
#11 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(113): Fiber->start()                                                                                                                 
#12 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop.php(406): Revolt\EventLoop\Internal\AbstractDriver->run()                                                                                                        
#13 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/functions.php(83): Revolt\EventLoop::run()                                                                                                                   
#14 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/process-runner.php(88): Amp\Parallel\Context\Internal\runContext()                                                                                           
#15 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/process-runner.php(89): Amp\Parallel\Context\Internal\{closure}()                                                                                            
#16 {main}

Next Amp\Future\UnhandledFutureError: Unhandled future: Amp\Http\Client\SocketException: "The HTTP/2 connection from '<redacted>:59720' to '<redacted>:443' closed unexpectedly"; Await the Future with Future::await() before the future is destroyed or use Future::ignore() to suppress this exception. Enable assertions and set AMP_DEBUG=true in the process environment to track its origin. in /home/ubuntu/trebbiano/vendor/amphp/amp/src/Internal/FutureState.php:53
Stack trace:                                                                                                                                                                                                                       
#0 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/Http2Connection.php(105): Amp\Internal\FutureState->__destruct()                                                                                                 
#1 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/HttpStream.php(89): Amp\Http\Client\Connection\Http2Connection->request()                                                                                        
#2 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\Connection\HttpStream->Amp\Http\Client\Connection\{closure}()                                                                            
#3 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/HttpStream.php(89): Amp\Http\Client\processRequest()                                                                                                             
#4 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/ConnectionLimitingPool.php(134): Amp\Http\Client\Connection\HttpStream->request()                                                                                
#5 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/HttpStream.php(89): Amp\Http\Client\Connection\ConnectionLimitingPool->Amp\Http\Client\Connection\{closure}()                                                    
#6 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\Connection\HttpStream->Amp\Http\Client\Connection\{closure}()                                                                            
#7 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/HttpStream.php(89): Amp\Http\Client\processRequest()                                                                                                             
#8 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Interceptor/DecompressResponse.php(43): Amp\Http\Client\Connection\HttpStream->request()                                                                                    
#9 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/InterceptedStream.php(56): Amp\Http\Client\Interceptor\DecompressResponse->requestViaNetwork()                                                                   
#10 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\Connection\InterceptedStream->Amp\Http\Client\Connection\{closure}()                                                                    
#11 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/InterceptedStream.php(39): Amp\Http\Client\processRequest()                                                                                                     
#12 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Interceptor/ModifyRequest.php(40): Amp\Http\Client\Connection\InterceptedStream->request()                                                                                 
#13 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/InterceptedStream.php(56): Amp\Http\Client\Interceptor\ModifyRequest->requestViaNetwork()                                                                       
#14 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\Connection\InterceptedStream->Amp\Http\Client\Connection\{closure}()                                                                    
#15 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/InterceptedStream.php(39): Amp\Http\Client\processRequest()                                                                                                     
#16 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Interceptor/ModifyRequest.php(40): Amp\Http\Client\Connection\InterceptedStream->request()                                                                                 
#17 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/InterceptedStream.php(56): Amp\Http\Client\Interceptor\ModifyRequest->requestViaNetwork()
#18 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\Connection\InterceptedStream->Amp\Http\Client\Connection\{closure}()
#19 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Connection/InterceptedStream.php(39): Amp\Http\Client\processRequest()
#20 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/PooledHttpClient.php(36): Amp\Http\Client\Connection\InterceptedStream->request()
#21 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\PooledHttpClient->Amp\Http\Client\{closure}()
#22 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/PooledHttpClient.php(29): Amp\Http\Client\processRequest()
#23 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Interceptor/RetryRequests.php(37): Amp\Http\Client\PooledHttpClient->request()
#24 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/InterceptedHttpClient.php(44): Amp\Http\Client\Interceptor\RetryRequests->request()
#25 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\InterceptedHttpClient->Amp\Http\Client\{closure}()
#26 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/InterceptedHttpClient.php(35): Amp\Http\Client\processRequest()
#27 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Interceptor/FollowRedirects.php(131): Amp\Http\Client\InterceptedHttpClient->request()
#28 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/InterceptedHttpClient.php(44): Amp\Http\Client\Interceptor\FollowRedirects->request()
#29 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\InterceptedHttpClient->Amp\Http\Client\{closure}()
#30 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/InterceptedHttpClient.php(35): Amp\Http\Client\processRequest()
#31 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/Interceptor/ModifyRequest.php(52): Amp\Http\Client\InterceptedHttpClient->request()
#32 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/InterceptedHttpClient.php(44): Amp\Http\Client\Interceptor\ModifyRequest->request()
#33 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(20): Amp\Http\Client\InterceptedHttpClient->Amp\Http\Client\{closure}()
#34 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/InterceptedHttpClient.php(35): Amp\Http\Client\processRequest()
#35 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/HttpClient.php(35): Amp\Http\Client\InterceptedHttpClient->request()
#36 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/functions.php(30): Amp\Http\Client\HttpClient->Amp\Http\Client\{closure}()
#37 /home/ubuntu/trebbiano/vendor/amphp/http-client/src/HttpClient.php(32): Amp\Http\Client\processRequest()                                                                                                                       
#38 /home/ubuntu/trebbiano/src/Parallel/Task/ZedUserMigrationTask.php(106): Amp\Http\Client\HttpClient->request()                                                                                                                  
#39 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Worker/Internal/task-runner.php(58): App\Parallel\Task\ZedUserMigrationTask->run()
#40 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(425): Amp\Parallel\Worker\Internal\{closure}()
#41 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(616): Revolt\EventLoop\Internal\AbstractDriver->invokeMicrotasks()
#42 [internal function]: Revolt\EventLoop\Internal\AbstractDriver->Revolt\EventLoop\Internal\{closure}()#43 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/DriverSuspension.php(171): Fiber->throw()
#44 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(425): Revolt\EventLoop\Internal\DriverSuspension::Revolt\EventLoop\Internal\{closure}()
#45 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(616): Revolt\EventLoop\Internal\AbstractDriver->invokeMicrotasks()
#46 [internal function]: Revolt\EventLoop\Internal\AbstractDriver->Revolt\EventLoop\Internal\{closure}()                                                                                                                           
#47 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(497): Fiber->resume()
#48 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(553): Revolt\EventLoop\Internal\AbstractDriver->invokeCallbacks()
#49 [internal function]: Revolt\EventLoop\Internal\AbstractDriver->Revolt\EventLoop\Internal\{closure}()                                                                                                                           
#50 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(113): Fiber->start()
#51 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop.php(406): Revolt\EventLoop\Internal\AbstractDriver->run()
#52 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/functions.php(83): Revolt\EventLoop::run()                                                                                                                   
#53 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/process-runner.php(88): Amp\Parallel\Context\Internal\runContext()
#54 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/process-runner.php(89): Amp\Parallel\Context\Internal\{closure}()
#55 {main}                                              

Next Revolt\EventLoop\UncaughtThrowable: Uncaught Amp\Future\UnhandledFutureError thrown in event loop callback Amp\Internal\FutureState::Amp\Internal\{closure} defined in /home/ubuntu/trebbiano/vendor/amphp/amp/src/Internal/FutureState.php:54; use Revolt\EventLoop::setErrorHandler() to gracefully handle such exceptions: Unhandled future: Amp\Http\Client\SocketException: "The HTTP/2 connection from '<redacted>:59720' to '<redacted>:443' closed unexpectedly"; Await the Future with Future::await() before the future is destroyed or use Future::ignore() to suppress this exception. Enable assertions and set AMP_DEBUG=true in the process environment to track its origin. in /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/UncaughtThrowable.php:13
Stack trace:                                            
#0 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(400): Revolt\EventLoop\UncaughtThrowable::throwingCallback()
#1 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php(116): Revolt\EventLoop\Internal\AbstractDriver::Revolt\EventLoop\Internal\{closure}()
#2 /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop.php(406): Revolt\EventLoop\Internal\AbstractDriver->run()
#3 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/functions.php(83): Revolt\EventLoop::run()                                                                                                                    
#4 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/process-runner.php(88): Amp\Parallel\Context\Internal\runContext()
#5 /home/ubuntu/trebbiano/vendor/amphp/parallel/src/Context/Internal/process-runner.php(89): Amp\Parallel\Context\Internal\{closure}()
#6 {main}                                               
  thrown in /home/ubuntu/trebbiano/vendor/revolt/event-loop/src/EventLoop/UncaughtThrowable.php on line 13                                                                                                                         
Killed

php -i summary:

phpinfo()
PHP Version => 8.3.6

System => Linux ip-10-80-1-210 6.5.0-1017-aws #17~22.04.2-Ubuntu SMP Mon Mar 25 20:28:54 UTC 2024 x86_64
Build Date => Apr 11 2024 20:23:38
Build System => Linux
Server API => Command Line Interface
Virtual Directory Support => disabled
Configuration File (php.ini) Path => /etc/php/8.3/cli
Loaded Configuration File => /etc/php/8.3/cli/php.ini
Scan this dir for additional .ini files => /etc/php/8.3/cli/conf.d
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/etc/php/8.3/cli/conf.d/20-fileinfo.ini,
/etc/php/8.3/cli/conf.d/20-ftp.ini,
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/etc/php/8.3/cli/conf.d/20-gmp.ini,
/etc/php/8.3/cli/conf.d/20-iconv.ini,
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/etc/php/8.3/cli/conf.d/20-phar.ini,
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/etc/php/8.3/cli/conf.d/20-sysvsem.ini,
/etc/php/8.3/cli/conf.d/20-sysvshm.ini,
/etc/php/8.3/cli/conf.d/20-tokenizer.ini,
/etc/php/8.3/cli/conf.d/20-xmlreader.ini,
/etc/php/8.3/cli/conf.d/20-xmlwriter.ini,
/etc/php/8.3/cli/conf.d/20-xsl.ini,
/etc/php/8.3/cli/conf.d/20-zip.ini

PHP API => 20230831
PHP Extension => 20230831
Zend Extension => 420230831
Zend Extension Build => API420230831,NTS
PHP Extension Build => API20230831,NTS
Debug Build => no
Thread Safety => disabled
Zend Signal Handling => enabled
Zend Memory Manager => enabled
Zend Multibyte Support => provided by mbstring
Zend Max Execution Timers => disabled
IPv6 Support => enabled
DTrace Support => disabled

Registered PHP Streams => https, ftps, compress.zlib, php, file, glob, data, http, ftp, compress.bzip2, phar, zip
Registered Stream Socket Transports => tcp, udp, unix, udg, ssl, tls, tlsv1.0, tlsv1.1, tlsv1.2, tlsv1.3
Registered Stream Filters => zlib.*, string.rot13, string.toupper, string.tolower, convert.*, consumed, dechunk, bzip2.*, convert.iconv.*

This program makes use of the Zend Scripting Language Engine:
Zend Engine v4.3.6, Copyright (c) Zend Technologies
    with Zend OPcache v8.3.6, Copyright (c), by Zend Technologies

Composer packages versions:

amphp/amp                           v3.0.1
amphp/byte-stream                   v2.1.1
amphp/cache                         v2.0.1
amphp/dns                           v2.1.2
amphp/hpack                         v3.2.1
amphp/http                          v2.1.1
amphp/http-client                   v5.1.0
amphp/parallel                      v2.2.9
amphp/parser                        v1.1.1
amphp/pipeline                      v1.2.0
amphp/process                       v2.0.3
amphp/serialization                 v1.0.0
amphp/socket                        v2.3.1
amphp/sync                          v2.2.0
amphp/windows-registry              v1.0.1
daverandom/libdns                   v2.1.0
kelunik/certificate                 v1.1.3
league/uri                          7.4.1
league/uri-components               7.4.1
league/uri-interfaces               7.4.1
monolog/monolog                     3.6.0
psr/cache                           3.0.0
psr/clock                           1.0.0
psr/container                       2.0.2
psr/event-dispatcher                1.0.0
psr/http-factory                    1.0.2
psr/http-message                    2.0
psr/log                             3.0.0
revolt/event-loop                   v1.0.6
symfony/cache                       v6.4.6
symfony/cache-contracts             v3.4.2
symfony/clock                       v6.4.5
symfony/config                      v6.4.6
symfony/console                     v6.4.6
symfony/dependency-injection        v6.4.6
symfony/deprecation-contracts       v3.4.0
symfony/dotenv                      v6.4.4
symfony/error-handler               v6.4.6
symfony/event-dispatcher            v6.4.3
symfony/event-dispatcher-contracts  v3.4.2
symfony/expression-language         v6.4.3
symfony/filesystem                  v6.4.6
symfony/finder                      v6.4.0
symfony/flex                        v2.4.5
symfony/framework-bundle            v6.4.6
symfony/http-foundation             v6.4.4
symfony/http-kernel                 v6.4.6
symfony/messenger                   v6.4.6
symfony/monolog-bridge              v6.4.4
symfony/monolog-bundle              v3.10.0
symfony/polyfill-intl-grapheme      v1.29.0
symfony/polyfill-intl-normalizer    v1.29.0
symfony/polyfill-mbstring           v1.29.0
symfony/polyfill-php83              v1.29.0
symfony/property-access             v6.4.6
symfony/property-info               v6.4.6
symfony/routing                     v6.4.6
symfony/runtime                     v6.4.3
symfony/serializer                  v6.4.6
symfony/service-contracts           v3.4.2
symfony/string                      v6.4.4
symfony/var-dumper                  v6.4.6
symfony/var-exporter                v6.4.6
symfony/yaml                        v6.4.3
@trowski
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trowski commented Apr 25, 2024

There appears to be a race condition which is releasing an HTTP/2 stream within a callback which later releases the same string. The hang may be then due to the unexpected exception, though I'm not certain.

I pushed a branch, 5.x...issue-361, which a quick fix for checking if the stream was previously released before attempting to release it again. Can you change your dependency on amphp/http-client to dev-issue-361 and see if the hang still occurs?

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@trowski @CRC-Mismatch