ThomasKrieger opened a new issue, #16033:
URL: https://github.com/apache/lucene/issues/16033
### Description
There is a data race in `org.apache.lucene.util.hnsw.BlockingFloatHeap`
The variable `size` which for example gets updated `offer` is accessed
outside a lock in the method `poll` leading to a data race:
```
public float poll() {
if (size > 0) {
float result;
lock.lock();
```
The data race can be reproduced with VMLens the test case is here:
[VMLens
testcase](https://github.com/vmlens/vmlens-examples/blob/master/lucene/src/test/java/org/apache/lucene/util/hnsw/TestBlockingFloatHeap.java)
### Version and environment details
MacOs
JVM 25
Lucence Core 10.3.2
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