The pthreads are not working on user space. ARM64 cortex_a53 but generic requirement.

[AshwinKrishn]

Describe the bug
Pthread is not working on ARM user space. The system exits when pthreads start.

Please also mention any information which could help others to understand
the problem you're facing:

• The pthread requires stack to execute and creating the stack array is not possible in user space.
• Is there a work around to provide it stack ?

To Reproduce
Steps to reproduce the behavior:

1. enable pthreads with user space

Expected behavior
Pthreads must work when called.

Impact
Unable to run multithreaded applications on arm64.

Environment (please complete the following information):

• OS: Linux,
• Toolchain Zephyr SDK

[dkalowsk]

This is not supported and closing as a bug. Please re-file as a feature request.

[cfriedt]

@AshwinKrishn - just thought I would chime in. This has been a feature in development for a long time. It's been on the backburner for me for a while. But yea, the assessment is accurate. There needs to be a new first-class Zephyr object type for "automatic" thread stacks, which requires dynamic objects. It applies to userspace only, not kernel threads.

See also #26999, #24714, #25973