Hi Christoph, There's something wrong with the nvme-pci heading for 6.2-rc1: no problem booting here on this Lenovo ThinkPad X1 Carbon 5th, but under load... nvme nvme0: I/O 0 (I/O Cmd) QID 2 timeout, aborting nvme nvme0: I/O 1 (I/O Cmd) QID 2 timeout, aborting nvme nvme0: I/O 2 (I/O Cmd) QID 2 timeout, aborting nvme nvme0: I/O 3 (I/O Cmd) QID 2 timeout, aborting nvme nvme0: Abort status: 0x0 nvme nvme0: Abort status: 0x0 nvme nvme0: Abort status: 0x0 nvme nvme0: Abort status: 0x0 nvme nvme0: I/O 0 QID 2 timeout, reset controller ...and more, until I just have to poweroff and reboot. Bisection points to your 0da7feaa5913 ("nvme-pci: use the tagset alloc/free helpers") And that does revert cleanly, giving a kernel which shows no problem. I've spent a while comparing old nvme_pci_alloc_tag_set() and new nvme_alloc_io_tag_set(), I do not know my way around there at all and may be talking nonsense, but it did look as if there might now be a difference in the queue_depth, sqsize, q_depth conversions. I'm running load successfully with the patch below, but I strongly suspect that the right patch will be somewhere else: over to you! Hugh --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4926,7 +4926,7 @@ int nvme_alloc_io_tag_set(struct nvme_ct memset(set, 0, sizeof(*set)); set->ops = ops; - set->queue_depth = ctrl->sqsize + 1; + set->queue_depth = ctrl->sqsize; /* * Some Apple controllers requires tags to be unique across admin and * the (only) I/O queue, so reserve the first 32 tags of the I/O queue.