kern/54275: nvme_poll() called too early?

[Thomas Klausner <wiz%NetBSD.org@localhost>]

>Number:         54275
>Category:       kern
>Synopsis:       nvme_poll() called too early?
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 05 23:10:00 +0000 2019
>Originator:     Thomas Klausner
>Release:        NetBSD 8.99.41
>Organization:
Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only that the cat died nobly.
- Arnold Edinborough
>Environment:
	
	
Architecture: x86_64
Machine: amd64
>Description:
Booting the amd64 USB install image from
https://nyftp.netbsd.org/pub/NetBSD-daily/HEAD/201905242230Z/images/
on a new Threadripper system with a Samsung SSD 1TB 970 Evo plus, I
see (handcopied):

panic: prevented jump to null instruction pointer (SMEP)
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x160
snprintf() at netbsd:snprintf
trap() at netbsd:trap+0x2ab
--- trap (number 6) ---
?() at 0
nvme_poll() at netbsd:nvme_poll+0x104
nvme_attach() at netbsd:nvme_atached+0x927
nvme_pci_attach() at netbsd_nvme_pci_attach+0x309
config_attach_loc()...
config_found_sm_loc()...
pci_probe_device()...
pci_enumerate_bus()...
pcirescan()...
pciattach()...
config_attach_loc()...
config_found_sm_loc()...
mp_pci_scan()...
amd64_mainbus_attach()...
mainbus_attach()...
config_attach_loc()...
cpu_configure()...
main()...
cpu0: End traceback

Disabling nvme with "userconf disable nvme*" makes the kernel boot successfully.

OpenBSD 6.5 and FreeBSD 12.0 boot successfully on the same system, including
the nvme device.

dmesg output for the nvme device (on NetBSD):

nvme0 at pci0 dev 0 function 0: vendor 144d product a808 (rev. 0x00) (not sure if it's 808 or 000 or something inbetween, bad screenshot)
nvme0: NVMe 1.3
nvme0: for admin queue interrupting at msix3 vec 0
nvme0: for io queue ... interrupting at msix3 vec ... affinity to cpu ... (where ... goes from 0 to 31)


>How-To-Repeat:
Boot on the system with nvme enabled (default on).
>Fix:
Please!

>Unformatted: