Connection market as broken SQLSTATE(08006), ErrorCode(0)

[cdprete]

Hello.
In my Spring Boot (3.4.0) JDBC application I'm using HikariCP 5.1.0 and, from time to time, I can see the following warning popping out:

024-12-16T00:54:47.789+01:00  WARN 2787738 --- [LoadGenerator] [ol-1-thread-346] com.zaxxer.hikari.pool.ProxyConnection   : HikariPool-1 - Connection org.postgresql.jdbc.PgConnection@52e398c0 marked as broken because of SQLSTATE(08006), ErrorCode(0)

org.postgresql.util.PSQLException: An I/O error occurred while sending to the backend.
        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:399) ~[postgresql-42.7.4.jar!/:42.7.4]
        at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:517) ~[postgresql-42.7.4.jar!/:42.7.4]
        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:434) ~[postgresql-42.7.4.jar!/:42.7.4]
        at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:194) ~[postgresql-42.7.4.jar!/:42.7.4]
        at org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:155) ~[postgresql-42.7.4.jar!/:42.7.4]
        at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[HikariCP-5.1.0.jar!/:na]
        at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[HikariCP-5.1.0.jar!/:na]
        at org.springframework.jdbc.core.JdbcTemplate.lambda$update$2(JdbcTemplate.java:977) ~[spring-jdbc-6.2.0.jar!/:6.2.0]
        at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:658) ~[spring-jdbc-6.2.0.jar!/:6.2.0]
        at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:972) ~[spring-jdbc-6.2.0.jar!/:6.2.0]
        at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:1016) ~[spring-jdbc-6.2.0.jar!/:6.2.0]
        at com.foo.bar.load.cockroachdb.CockroachDbRepository.save(CockroachDbRepository.java:88) ~[!/:0.0.1-SNAPSHOT]
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source) ~[na:na]
        at java.base/java.lang.reflect.Method.invoke(Unknown Source) ~[na:na]
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:359) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:196) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:89) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at com.foo.bar.load.cockroachdb.CockroachDbRetryableTransactionAspect.doInTransaction(CockroachDbRetryableTransactionAspect.java:42) ~[!/:0.0.1-SNAPSHOT]
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source) ~[na:na]
        at java.base/java.lang.reflect.Method.invoke(Unknown Source) ~[na:na]
        at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:638) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:628) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:71) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:173) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:380) ~[spring-tx-6.2.0.jar!/:6.2.0]
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:727) ~[spring-aop-6.2.0.jar!/:6.2.0]
        at com.foo.bar.load.cockroachdb.CockroachDbRepository$$SpringCGLIB$$0.save(<generated>) ~[!/:0.0.1-SNAPSHOT]
        at com.foo.bar.load.cockroachdb.CockroachDbPersister.persist(CockroachDbPersister.java:73) ~[!/:0.0.1-SNAPSHOT]
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) ~[na:na]
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) ~[na:na]
        at java.base/java.lang.Thread.run(Unknown Source) ~[na:na]
Caused by: java.io.EOFException: null
        at org.postgresql.core.PGStream.receiveChar(PGStream.java:478) ~[postgresql-42.7.4.jar!/:42.7.4]
        at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2174) ~[postgresql-42.7.4.jar!/:42.7.4]
        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:372) ~[postgresql-42.7.4.jar!/:42.7.4]
        ... 35 common frames omitted

Unfortunately, it doesn't seem to be only a warning because my application indeed stops to ingest data.
The pool is configured as follows:

spring.datasource:
  hikari:
    auto-commit: true
    maximum-pool-size: 384
    max-lifetime: 1800000
    data-source-properties:
      sslmode: disable
      ApplicationName: CockroachDB JDBC