WebClient resolver doing eventloop-work on worker

[tobias-]

It happens relatively seldom, but maybe once every 10 minutes or so and is only seen when debugging (as it's an assertion that's reporting the issue).

There are multiple WebClient's in the VM, but the simplest one that keeps throwing this is (yes, creates a new WebClient for every request, but it's one request every couple of minutes):

WebClient.of().get("https://host/path")
                .aggregate()
                .get()

2024-09-04T10:38:24.422795111Z {179} [WARNING] AbstractEventExecutor A task raised an exception. Task: com.linecorp.armeria.client.RefreshingAddressResolver$$Lambda$1341/0x0000000101491218@569ce20b[armeria-common-worker-epoll-3-3]
java.lang.AssertionError
    at com.linecorp.armeria.internal.client.dns.DefaultDnsResolver.resolveOne(DefaultDnsResolver.java:88)
    at com.linecorp.armeria.internal.client.dns.DefaultDnsResolver.resolve(DefaultDnsResolver.java:81)
    at com.linecorp.armeria.client.RefreshingAddressResolver.sendQueries(RefreshingAddressResolver.java:161)
    at com.linecorp.armeria.client.RefreshingAddressResolver.access$500(RefreshingAddressResolver.java:56)
    at com.linecorp.armeria.client.RefreshingAddressResolver$CacheEntry.refresh(RefreshingAddressResolver.java:356)
    at io.netty.util.concurrent.AbstractEventExecutor.runTask$$$capture(AbstractEventExecutor.java:173)
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:166)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:405)
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:994)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:833)

Issue was present in at least 1.27.3 and is still present in 1.30.0.

@-mention me in the discord thread if you need help reproducing it/stepit or more logs.