From Jesse Vincent <jesse@fsck.com> via Andrew Lutomirski <amluto@gmail.com>:

A friend of mine [Jesse] has a brand new LG laptop that has intermittent NVMe
failures.  They mostly happen during a suspend/resume cycle
(apparently during suspend, not resume).  Unlike the earlier
Dell/Samsung issue, the NVMe device isn't completely gone -- MMIO
reads fail, but PCI configuration space is apparently still there:

nvme nvme0: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0x10

and it comes with a nice AER dump:

[12720.894411] pcieport 0000:00:1c.0: AER: Multiple Corrected error
received: id=00e0
[12720.909747] pcieport 0000:00:1c.0: PCIe Bus Error:
severity=Corrected, type=Physical Layer, id=00e0(Transmitter ID)
[12720.909751] pcieport 0000:00:1c.0:   device [8086:9d14] error
status/mask=00001001/00002000
[12720.909754] pcieport 0000:00:1c.0:    [ 0] Receiver Error         (First)
[12720.909756] pcieport 0000:00:1c.0:    [12] Replay Timer Timeout
...