CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel's jbd2 component affects systems utilizing the journal block device (JBD) by allowing excessive lock hold times when processing checkpoint buffers, particularly if they are busy. This can lead to soft lockups or RCU stalls, negatively impacting system performance and stability. Organizations using Linux systems, especially those with high transaction volumes, should prioritize addressing this issue to maintain optimal operation and prevent potential downtime.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: jbd2: bound shrinker scans by examined checkpoint buffers The jbd2 shrinker currently accounts only checkpoint buffers that it successfully releases against nr_to_scan. Busy buffers therefore do not consume the scan budget. If a checkpoint transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs spinning on j_list_lock, causing soft lockups or RCU stalls. Pass nr_to_scan into journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL from checkpoint cleanup paths so their existing full-list behavior is preserved. This restores the scan-budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete checkpoint list.