Gilthoniel opened a new issue, #1257:
URL: https://github.com/apache/pulsar-client-go/issues/1257
#### Expected behavior
Closing a producer should never produce an inconsistent sequence of messages
according to Send / SendAsync order of calls.
#### Actual behavior
When a producer is starting a reconnect loop, and is requested to close at
the same time, it can happen that one or more pending batches are dropped and
following ones are published.
#### Steps to reproduce
I can't provide a consistent way of reproducing this because it is very
random and rare as you need to get unlucky on the sequence of events.
Here is the list of logs that lead me to that discovery:
```
{"ts": "2024-07-23T20:50:42.023Z", "msg": "Closing producer", "producerID":
36}
{"ts": "2024-07-23T20:50:42.023Z", "msg": "Connected producer",
"producerID": 36, "epoch": 10}
{"ts": "2024-07-23T20:50:42.038Z", "msg": "Failing 1 messages on closing
producer", "producerID": 36}
```
This is demonstrating the possible race between:
```Go
func (p *partitionProducer) doClose(reason error)
```
And
```Go
func (p *partitionProducer) grabCnx(assignedBrokerURL string) error
```
#### System configuration
**Pulsar version**: v3.0.5
**Pulsar Go client**: v12.1
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