lhotari opened a new issue, #23848:
URL: https://github.com/apache/pulsar/issues/23848

   ### Search before asking
   
   - [x] I searched in the [issues](https://github.com/apache/pulsar/issues) 
and found nothing similar.
   
   
   ### Read release policy
   
   - [x] I understand that unsupported versions don't get bug fixes. I will 
attempt to reproduce the issue on a supported version of Pulsar client and 
Pulsar broker.
   
   
   ### Version
   
   Pulsar 4.0.1
   
   ### Minimal reproduce step
   
   Exact steps to reproduce aren't yet confirmed.
   
   This problem was faced in a test. The problem is that there isn't a `jstack 
-l <PID>` thread dump of the deadlocked state. I have a heap dump, but since 
heap dumps don't contain exactly the same information as a thread dump about 
threads, it's hard to find out the exact reason why the dead lock happens. 
There are multiple blocked threads which indicates a dead lock:
   
   <img width="1314" alt="Image" 
src="https://github.com/user-attachments/assets/e0e94d2b-d61d-478a-b644-41dad2b93e65";
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   <img width="1153" alt="Image" 
src="https://github.com/user-attachments/assets/34da420d-33bb-4185-819e-96812a12910b";
 />
   
   <img width="1011" alt="Image" 
src="https://github.com/user-attachments/assets/b7d02f4e-cc0a-4de6-b943-f18ff747d94d";
 />
   
   <img width="1129" alt="Image" 
src="https://github.com/user-attachments/assets/4715666f-f498-47a4-933c-b8e6a652ed85";
 />
   
   <img width="1197" alt="Image" 
src="https://github.com/user-attachments/assets/371366a4-938e-4994-8291-ca593389618f";
 />
   
   <img width="1200" alt="Image" 
src="https://github.com/user-attachments/assets/28c78430-0a79-46ff-bd4c-c356e3538424";
 />
   
   <img width="1203" alt="Image" 
src="https://github.com/user-attachments/assets/6a0a4f9f-2541-4584-a619-0a29105c53b9";
 />
   
   <img width="1241" alt="Image" 
src="https://github.com/user-attachments/assets/f4ff8988-3d03-47e8-aa83-1263f13e530f";
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   <img width="1244" alt="Image" 
src="https://github.com/user-attachments/assets/13a3a20a-68db-4913-b502-2e3fdd5d5002";
 />
   
   ### What did you expect to see?
   
   No dead locks.
   
   ### What did you see instead?
   
   There are multiple threads in blocked state which indicates a dead lock.
   
   ### Anything else?
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   - [x] I'm willing to submit a PR!


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