Users of various Linux distributions using the BFQ I/O scheduler, after updating the Linux kernel to release 5.14.7, encountered an issue causing the kernel to crash within a few hours of booting. The problem also continues to manifest itself in the 5.14.8 kernel. The reason was a regressive change in the I / O scheduler BFQ (Budget Fair Queueing) transferred from the test branch 5.15, which has so far been eliminated only in the form of a patch.
As a workaround to solve the problem, you can replace the scheduler with mq-deadline. For example, for device nvme0n1: echo mq-deadline > /sys/block/nvme0n1/queue/scheduler
Source: opennet.ru