Jens Axboe

تم تحديد مشكلة في نواة لينكس حيث يمكن أن تعمل الدالة `bfq merge bio()` بمعلومات cgroup قديمة عند ترحيل عملية إلى cgroup مختلفة. قد يؤدي ذلك إلى دمج bio مع طلب من cgroup مختلفة، أو دمج `bfqqs` لـ cgroups مختلفة، مما قد يتسبب في مشكلات الاستخدام بعد التحرير (use-after-free).

A NULL pointer dereference issue has been resolved in the Linux kernel. The problem occurred when the `acpi dev put()` function was called on a possibly NULL pointer, which was not handled correctly by the helper inline function. This issue was caused by a change in the `for each acpi dev match()` function. To fix this, the `acpi dev put()` function has been modified to silently accept a NULL pointer.

The issue is related to the io uring feature in the Linux kernel, where the function `io uring cancel sqpoll()` is intended to cancel all requests of a specified context. However, it uses per-task counters to track the number of inflight requests, which can lead to the function going to sleep waiting for requests to appear that will never happen. This can cause the task to hang. The issue affects contexts that share sqpoll and continue to use shared counters.