From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Title: - Description: In the poll routine, when traversing the xarray, there is a lack of lock protection. Even though the RCU read lock is held, only the radix tree slots are guaranteed to be locked, while the data structures stored in those slots (such as ) are not protected. The poll routine traverses the radix tree and references , so the RCU read lock provides insufficient protection in this case. A spinlock is required for proper protection. 2. Fix Details: - Fix Commit: - Fixer: Jingbo Xu - Fix Commit Link: Click here 3. Related Links: - Original Submission - Upstream Submission 4. Code Changes: - File: - Changes: - Added a check for . - When is true, added a check for . - Added calls to and . 5. Authors and Contributors: - Author: Jingbo Xu - Contributors: Baokun Li , Jeff Layton , Jia Zhu , Gao Xiang , Christian Brauner , Sasha Levin This information helps us understand the vulnerability's background, the fix process, and the specific code changes made.