Test case vector_index.ivf_async_task hangs

Environment

• Version: seekdb (OceanBase seekdb)
• Revision: 1-275e64ef460709c00b83d0e4b850c81b311a2811
• Build Branch: master
• Build Time: May 8 2026 22:24:10
• Build Flags: RelWithDebInfo
• Build Info: obbuild-release-master-100993
• Is this an RD-provided temporary version?: No

Description

A regression test case named vector_index.ivf_async_task consistently hangs. This issue was introduced on May 8th and is currently under bisection.

Steps to Reproduce

1. Connect using: obclient -h -uroot -P10001
2. Execute the test case: vector_index.ivf_async_task

The case hangs reliably. For detailed statistics, refer to the internal regression tracking link: https://work.oceanbase-dev.com/regression/case/statistics/detail/108136409138

Impact

This is a regression introduced on May 8th, causing a test case to hang. It requires investigation and resolution.

Additional Context

This issue was reported from an external business perspective. The original internal workflow required selecting an appropriate item type (e.g., Customer Feedback, Online Issue, Online Fault) based on the stage and impact.

Start by reproducing vector_index.ivf_async_task with obclient against the reported seekdb revision and build, then compare the regression statistics linked in the issue. Investigate the regression introduced on May 8 while bisection is in progress. Done means the test completes without hanging and the regression is resolved.