idehong opened a new issue, #1365:
URL: https://github.com/apache/pulsar-client-go/issues/1365
#### Expected behavior
When calling producer.SendAsync to produce messages, it cannot be blocked
and deadlock
#### Actual behavior
When calling producer.SendAsync to produce a message, an error occurs. The
producer.Close interface is called in the callback of SendAsync, causing the
process to deadlock.
same goroutinue are deadlock，call stack：
```
sync.runtime_SemacquireMutex(0x1288980?, 0x20?, 0x15b15a0?)
/myapp/go1.23.0/go/src/runtime/sema.go:95 +0x25
sync.(*Mutex).lockSlow(0xc00084b0ac)
/myapp/go1.23.0/go/src/sync/mutex.go:173 +0x15d
sync.(*Mutex).Lock(0x11c4b80?)
/myapp/go1.23.0/go/src/sync/mutex.go:92 +0x32
sync.(*Once).doSlow(0xc00084b0a8, 0xc001ae7098)
/myapp/go1.23.0/go/src/sync/once.go:72 +0x3a
sync.(*Once).Do(0xc00084b0a8, 0xc001ae7098)
/myapp/go1.23.0/go/src/sync/once.go:67 +0x33
github.com/apache/pulsar-client-go/pulsar.(*producer).Close(0xc9870a?)
```
#### Steps to reproduce
1. call producer.SendAsync
2. call the producer.Close in the SendAsync failure callback function
How can we reproduce the issue
#### System configuration
**Pulsar version**: 0.14
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