The Linux kernel's rqspinlock deadlock detection mechanism suppressed destruction of the waiter queue to allow other waiters to attempt lock acquisition after detecting a deadlock. However, it failed to reset the tail pointer in the queue, causing the final waiter to wait indefinitely for a next waiter that might never arrive, resulting in intermittent or indefinite stalls. This issue is specific to ABBA deadlocks, as AA deadlocks are guarded against entry into the wait queue. The patch fixes this by resetting the tail pointer and signaling the next waiter appropriately, ensuring the queue does not stall indefinitely.

This vulnerability can cause intermittent stalls or indefinite blocking in kernel locking paths during specific ABBA deadlock scenarios. Such stalls could degrade system responsiveness or cause hangs in affected kernel operations relying on rqspinlock. There is no indication of privilege escalation or data corruption from the provided information.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The description indicates the vulnerability has been resolved in the Linux kernel, so applying the relevant kernel update when available is recommended to address this issue.