jarohen opened a new issue, #906:
URL: https://github.com/apache/arrow-java/issues/906
### Describe the bug, including details regarding any error messages,
version, and platform.
```kotlin
@Test
fun testArrowBufRetainBug() {
RootAllocator().use { al ->
val buf = al.buffer(10)
buf.close()
// correctly throws
assertThrows<IllegalArgumentException> {
buf.referenceManager.retain() }
assertEquals(0, buf.refCnt()) // nope, it's 1
// doesn't throw, ref-count is 1 - so the caller assumes they've
successfully taken a reference
// but the underlying memory has already been reclaimed and re-used
assertThrows<IllegalArgumentException> {
buf.referenceManager.retain() }
}
}
```
Caused by the `getAndAdd` in `BufferLedger.retain(int)` - this is what
leaves the ref-count positive, so on the next call, this doesn't fail.
Some kind of compareAndSet instead, perhaps?
Cheers,
James
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