AER (Advanced Error Reporting)
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NVMe AER Issues
There are many community reports AER error on boot on various systems. [1]
Kernel boot error
The pci=noaer directive tells AER to not report errors. Those error reports would go into a log file, and each error sends a time-consuming interrupt request (IRQ) to the central processor. A rapid flow of error reports could thus flood the drive -- and clog NVMe bandwidth, slowing or even halting bootup.
The nvme 0000:xx:xx.x AER message identifies that error as from the NVMe M.2 connection to the PCIe bus.
So, the NVMe drive may be healthy, but there could be trouble brewing around the PCIe subsystem