printing the log directly will obviously cause a JVM deadlock

[hustchaya]

In the recordSample function, printing the log directly will obviously cause a JVM deadlock. Would you like to inquire about this detailed principle and solution?

[apangin]

I'm not sure I understand the question. Are you talking about an existing async-profiler issue or you are trying to develop new functionality?

Since logging relies on *printf functions, it's unsafe to use it inside a signal handler.
See signal-safety(7) for the list of functions safe to call inside a signal handler.

[hustchaya]

I'm trying to make some modifications that suit my product. Thank you very much for your reply. My doubts have been resolved.