WebClient fails when sending multipart formdata from a virtual thread

[bramdrenthe]

Version

5.0.0 CR3

Context

Executing a webclient.sendMultipartForm with files > 250kb seems to fail when being called from a virtual thread.

Stacktrace

Exception: java.lang.IllegalArgumentException
io.vertx.ext.web.client.impl.MultipartFormUpload.pump:159
io.vertx.ext.web.client.impl.MultipartFormUpload$1.handleResume:69
io.netty.util.concurrent.AbstractEventExecutor.runTask:148
io.netty.util.concurrent.AbstractEventExecutor.safeExecute:141
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks:521
io.netty.channel.SingleThreadIoEventLoop.run:160
io.netty.util.concurrent.SingleThreadEventExecutor$5.run:1123
io.netty.util.internal.ThreadExecutorMap$2.run:74
io.netty.util.concurrent.FastThreadLocalRunnable.run:30
java.lang.Thread.run:1583

Do you have a reproducer?

https://github.com/bramdrenthe/vertx-multipart-issue

Steps to reproduce

1. Checkout above repository
2. ./gradlew run
3. Will start a local webserver at port 23456, and tries to send multipart formdata with 500kb file from both an eventloop verticle and a virtualthread verticle. Only the eventloop verticle will succeed.

Extra

Mac OS 15.2 // M2 Max
OpenJDK Runtime Environment (build 21.0.2+13-58)

[tsegismont]

Looking into it

[tsegismont]

Possible duplicate of #2685