tobizhang opened a new issue, #13560:
URL: https://github.com/apache/dubbo/issues/13560
### Environment
* Dubbo version: 3.2.10
* Operating System version: mac
* Java version: jdk8
### Steps to reproduce this issue
1. 使用dubbo-spring-boot-starter和nacos通过springboot
web应用拉起dubbo提供者服务时，会deadlock，日志如下：
"main" Id=1 BLOCKED on org.apache.dubbo.config.spring.ServiceBean@4840dee0
owned by "Dubbo-ots-service-export-thread-1" Id=300
at org.apache.dubbo.config.ServiceConfig.register(ServiceConfig.java:353)
- blocked on org.apache.dubbo.config.spring.ServiceBean@4840dee0
at
org.apache.dubbo.config.deploy.DefaultModuleDeployer.registerServiceInternal(DefaultModuleDeployer.java:491)
at
org.apache.dubbo.config.deploy.DefaultModuleDeployer.registerServices(DefaultModuleDeployer.java:431)
at
org.apache.dubbo.config.deploy.DefaultModuleDeployer.startSync(DefaultModuleDeployer.java:191)
- locked org.apache.dubbo.config.deploy.DefaultModuleDeployer@19d1ac5
at
org.apache.dubbo.config.deploy.DefaultModuleDeployer.start(DefaultModuleDeployer.java:156)
at
org.apache.dubbo.config.spring.context.DubboDeployApplicationListener.onContextRefreshedEvent(DubboDeployApplicationListener.java:153)
- locked java.util.concurrent.ConcurrentHashMap@381ae39 <---- but
blocks 6 other threads!
at
org.apache.dubbo.config.spring.context.DubboDeployApplicationListener.onApplicationEvent(DubboDeployApplicationListener.java:138)
at
org.apache.dubbo.config.spring.context.DubboDeployApplicationListener.onApplicationEvent(DubboDeployApplicationListener.java:47)
at
org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at
org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at
org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at
org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:398)
at
org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:355)
at
org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:882)
at
org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:163)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
- locked java.lang.Object@3775b7f2
at
org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
at
org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
at
org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
at com.xxx.cpods.xxx.rpc.api.RpcApplication.main(RpcApplication.java:83)
通过去除DubboDeployApplicationListener.onContextRefreshedEvent中的synchronized代码可以解决这个死锁问题。但不知是否有其他影响
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