[Bug] Bug Report: TypeError When Executing Batched Syscalls with RR Scheduler

[JianlongCao]

Checked other resources

• I added a very descriptive title to this issue.
• I am sure the issue hasn't been already addressed by searching through https://github.com/agiresearch/AIOS/issues.
• The usage issue is not resolved by updating to the latest stable version in the main branch.

Describe your current environment

No response

Describe the bug

Description
A TypeError occurs when using the RR scheduler with the demo agent and use_context_manager: true in config.yaml. When a single LLMSyscall object is passed to _execute_batch_syscalls instead of a list, the following error appears:

TypeError: 'LLMSyscall' object is not iterable

Prerequisites
config.yaml is configured with:
use_context_manager: true
RR scheduler is being used.

• The demo agent is triggered to generate syscalls.

• Version: latest main branch (2025-07-09).

• Reproduction Steps

• Set use_context_manager: true in config.yaml.

• Use the RR scheduler.

• Trigger the demo agent to run.

• Observe the exception in the logs.

Expected Behavior
_execute_batch_syscalls should always receive a list of syscalls. If a single syscall is passed, it should either be wrapped in a list or the function should raise an informative error.

Actual Behavior
A TypeError is raised because a single LLMSyscall object is not iterable.

Logs / Stack Trace

Exception in thread process_llm_requests:
Traceback (most recent call last):
  File "/home/jianlong/miniconda3/envs/aios/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/home/jianlong/miniconda3/envs/aios/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "/home/jianlong/AIOS/aios/scheduler/rr_scheduler.py", line 181, in process_llm_requests
    self._execute_batch_syscalls(llm_syscall, self.llm.execute_llm_syscalls, "LLM")
  File "/home/jianlong/AIOS/aios/scheduler/rr_scheduler.py", line 134, in _execute_batch_syscalls
    for syscall in batch:
TypeError: 'LLMSyscall' object is not iterable

[evison]

We have made bug fixes to the code, could you test again? Feel free to report any errors.