Test Class: distributed/tensor/test_dtensor_testbase.py::DTensorTestBaseUtilCPUTest
Number of Failing Tests: 1
Platform: Distributed
Test Type: Unit Test
Error Pattern: single_issue

Summary:
Test in DTensorTestBaseUtilCPUTest is failing with process timeout and resource unavailability errors in distributed environment.

Version Information:

• PyTorch Commit: 6bdd8c9
• Branch: main
• Test Date: 2026-01-13
• Python Version: 3.12
• Sprint: Sprint 24

Failure Pattern:
Test times out after 300 seconds and then fails with resource unavailability on retry

Common Error:

RuntimeError: Process 0 terminated or timed out after 300.08277130126953 seconds

On retry:
RuntimeError: Resource temporarily unavailable
  backend_class = ProcessGroupGloo(...)

Failing Tests:
1. test_dtensor_testbase_destroy_pg

Steps to Reproduce:
1. Run test:

   TEST_CONFIG=cpu python3 test/run_test.py -i distributed/tensor/test_dtensor_testbase
   TEST_CONFIG=distributed python3 test/run_test.py -i distributed/tensor/test_dtensor_testbase
   

2. Observe process timeout followed by resource unavailability on retry

Expected Result:
Test should complete within timeout and process groups should be properly destroyed

Actual Result:
Process 0 times out after 300 seconds, subsequent retry fails with resource unavailability when initializing ProcessGroupGloo

Root Cause Analysis:
The test is experiencing issues with:
1. Process group destruction taking too long or hanging
2. Resource exhaustion (possibly file descriptors or network ports) preventing ProcessGroupGloo initialization
3. Improper cleanup of previous test processes

Potential Solutions:
1. Increase timeout for process group operations
2. Ensure proper cleanup of resources between test runs
3. Investigate why ProcessGroupGloo initialization fails with resource unavailability
4. Check for leaked file descriptors or network connections

Priority: P2