[GitHub] [pulsar] zbentley opened a new issue, #16009: When using the Python pulsar client, crashes occasionally happen on connect/disconnect/close due to pthread_mutex_lock assertion failures

[GitBox <gi...@apache.org>]

zbentley opened a new issue, #16009:
URL: https://github.com/apache/pulsar/issues/16009

   **Describe the bug**
   Occasionally, in flakey CI tests that run Python code in a heavily threaded environment, we have segfaults when calling `connect`, `create_producer`, or `producer.close()` on Pulsar client objects.
   
   I wish I had more debugging info or a full C system call trace, but the failures occur only in CI where I can't use `gdb`, and Python's `faulthandler` doesn't seem to provide a stacktrace unfortunately.
   
   The errors always have these characteristics:
   - They exist in an environment with many threads.
   - Some of the threads have previously used a Pulsar client, and still exist, but are not using that client.
   - The current thread attempting to use the Pulsar client is doing a `connect`, `create_producer`, or `producer.close()` operation.
   - The error line is either an unhandled SIGSEGV, or an abort with the description `[__pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed](https://stackoverflow.com/questions/9239999/pthread-mutex-lock-c62-pthread-mutex-lock-assertion-mutex-data-owner)`.
   
   I'm sorry I don't have more specific debugging or reproduction information.
   
   This only occurs on client 2.10.0; we're using that client with Python 3.7.13 on Linux, in Docker, x86_64 arch.


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[GitHub] [pulsar] github-actions[bot] commented on issue #16009: When using the Python pulsar client, crashes occasionally happen on connect/disconnect/close due to pthread_mutex_lock assertion failures

[GitBox <gi...@apache.org>]

github-actions[bot] commented on issue #16009:
URL: https://github.com/apache/pulsar/issues/16009#issuecomment-1179897076

   The issue had no activity for 30 days, mark with Stale label.


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