SUSE: CVE-2024-26937: SUSE Linux Security Advisory

In the Linux kernel, the following vulnerability has been resolved:

drm/i915/gt: Reset queue_priority_hint on parking

Originally, with strict in order execution, we could complete execution
only when the queue was empty. Preempt-to-busy allows replacement of an
active request that may complete before the preemption is processed by
HW. If that happens, the request is retired from the queue, but the
queue_priority_hint remains set, preventing direct submission until
after the next CS interrupt is processed.

This preempt-to-busy race can be triggered by the heartbeat, which will
also act as the power-management barrier and upon completion allow us to
idle the HW. We may process the completion of the heartbeat, and begin
parking the engine before the CS event that restores the
queue_priority_hint, causing us to fail the assertion that it is MIN.

sched_engine->queue_priority_hint != (-((int)(~0U >> 1)) - 1))

...
-0 5d.H3. 165741207us : execlists_irq_handler: 0000:00:02.0 rcs0: semaphore yield: 00000040
sched_engine->queue_priority_hint != (-((int)(~0U >> 1)) - 1))


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