Memory leak since version `5.8.0`

Open

#1,186 opened on Jul 20, 2023 2 comments 1 reaction 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 45/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: java
Domain: api, backend

Research direction

Start with the supplied Main.java and CloudFoundryService.java reproducer, then trace getClient(), connectionContext(), and the DefaultConnectionContext stack frames in the report. Run the repeated calls on Linux or Cloud Foundry and compare behavior with versions 5.7.0 and 5.8.0. Done means the repeated calls no longer exhaust direct buffer memory and the regression is covered by a reproducible verification.

Written by the indexing model from the issue text.

Description

The following code results in a memory leak:

Main.java

package org.example;

import org.cloudfoundry.client.v2.users.GetUserResponse;
import org.cloudfoundry.client.v3.roles.RoleType;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.util.List;

@SpringBootApplication
public class Main {
    public static void main(String[] args) {
        System.out.println("Hello world!");

        SpringApplication.run(Main.class, args);

        triggerCalls();
    }

    public static void triggerCalls() {
        CloudFoundryService cloudFoundryService = new CloudFoundryService();

        for (int i = 0; i < 100; i++) {
            try {
                GetUserResponse getUserResponse = cloudFoundryService.getUser("c33c0489-2f84-4ddc-9b6a-e4f73c8be628");
                System.out.println("Fetch " + i + " : " + getUserResponse.getEntity().getUsername());

                List<RoleType> roleTypes = cloudFoundryService.getUserRoles();

            } catch (Exception e) {
            }
        }

        System.out.println("DONE");

    }
}

CloudFoundryService.java

package org.example;

import org.cloudfoundry.client.v2.users.GetUserRequest;
import org.cloudfoundry.client.v2.users.GetUserResponse;
import org.cloudfoundry.client.v3.roles.ListRolesRequest;
import org.cloudfoundry.client.v3.roles.RoleResource;
import org.cloudfoundry.client.v3.roles.RoleType;
import org.cloudfoundry.reactor.DefaultConnectionContext;
import org.cloudfoundry.reactor.client.ReactorCloudFoundryClient;
import org.cloudfoundry.reactor.tokenprovider.PasswordGrantTokenProvider;

import java.util.List;
import java.util.stream.Collectors;

public class CloudFoundryService {

    private String user = "user";
    private String password = "1234";

    public GetUserResponse getUser(String userId) {
        return this.getClient().users().get(GetUserRequest.builder().userId(userId).build()).block();
    }

    public List<RoleType> getUserRoles() {
        return this.getClient().rolesV3().list(ListRolesRequest.builder().build())
                .map(userRoleListResponse -> {
                    return userRoleListResponse.getResources().stream()
                            .map(RoleResource::getType)
                            .collect(Collectors.toList());
                })
                .block();

    }

    ReactorCloudFoundryClient getClient() {
        return ReactorCloudFoundryClient.builder()
                .connectionContext(this.connectionContext())
                .tokenProvider(this.tokenProvider())
                .build();
    }

    DefaultConnectionContext connectionContext() {
        return DefaultConnectionContext.builder()
                .apiHost("api.domain.com")
                .build();
    }

    PasswordGrantTokenProvider tokenProvider() {
        return PasswordGrantTokenProvider.builder()
                .password(this.password)
                .username(this.user)
                .build();
    }
}

Here's a stack trace:

Stacktrace

24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR Exception in thread "main" java.lang.reflect.InvocationTargetException
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/java.lang.reflect.Method.invoke(Unknown Source)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR Caused by: java.lang.OutOfMemoryError: Cannot reserve 49152 bytes of direct buffer memory (allocated: 10444808, limit: 10485760)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/java.nio.Bits.reserveMemory(Unknown Source)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/java.nio.DirectByteBuffer.<init>(Unknown Source)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/java.nio.ByteBuffer.allocateDirect(Unknown Source)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.unix.Buffer.allocateDirectWithNativeOrder(Buffer.java:40)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.epoll.EpollEventArray.<init>(EpollEventArray.java:58)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.epoll.EpollEventLoop.<init>(EpollEventLoop.java:95)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.epoll.EpollEventLoopGroup.newChild(EpollEventLoopGroup.java:187)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.epoll.EpollEventLoopGroup.newChild(EpollEventLoopGroup.java:37)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:60)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:49)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:114)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:101)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:78)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.resources.DefaultLoopEpoll.newEventLoopGroup(DefaultLoopEpoll.java:93)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.resources.DefaultLoopResources.cacheNativeServerLoops(DefaultLoopResources.java:254)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.resources.DefaultLoopResources.cacheNativeClientLoops(DefaultLoopResources.java:219)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.resources.DefaultLoopResources.onClient(DefaultLoopResources.java:139)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.transport.NameResolverProvider.newNameResolverGroup(NameResolverProvider.java:473)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.transport.ClientTransportConfig.lambda$getOrCreateResolver$0(ClientTransportConfig.java:240)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(Unknown Source)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.internal.util.MapUtils.computeIfAbsent(MapUtils.java:46)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.transport.ClientTransportConfig.getOrCreateResolver(ClientTransportConfig.java:239)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.transport.ClientTransport.runOn(ClientTransport.java:352)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.transport.ClientTransport.runOn(ClientTransport.java:42)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at reactor.netty.transport.Transport.runOn(Transport.java:249)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.cloudfoundry.reactor._DefaultConnectionContext.configureHttpClient(_DefaultConnectionContext.java:265)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.cloudfoundry.reactor._DefaultConnectionContext.getHttpClient(_DefaultConnectionContext.java:105)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.cloudfoundry.reactor.DefaultConnectionContext.access$2201(DefaultConnectionContext.java:26)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.cloudfoundry.reactor.DefaultConnectionContext$InitShim.getHttpClient(DefaultConnectionContext.java:126)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.cloudfoundry.reactor.DefaultConnectionContext.<init>(DefaultConnectionContext.java:83)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.cloudfoundry.reactor.DefaultConnectionContext.<init>(DefaultConnectionContext.java:26)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.cloudfoundry.reactor.DefaultConnectionContext$Builder.build(DefaultConnectionContext.java:1167)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.example.CloudFoundryService.connectionContext(CloudFoundryService.java:45)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.example.CloudFoundryService.getClient(CloudFoundryService.java:37)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.example.CloudFoundryService.getUser(CloudFoundryService.java:21)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.example.Main.triggerCalls(Main.java:25)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR at org.example.Main.main(Main.java:17)
24/07/2023, 08:31:01 [APP/PROC/WEB/0] ERR ... 8 more

It is not reproducible locally (macOS). We deploy this as a CloudFoundry app (linux).

It is not reproducible with version 5.7.0.

Dominant language: Java
Stars: 334
Forks: 319
PR merge metrics: No merged PRs in 30d

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