[Bug 211620] Cannot boot on zfs with nvme in system

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211620

            Bug ID: 211620
           Summary: Cannot boot on zfs with nvme in system
           Product: Base System
           Version: 10.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: braddeicide at hotmail.com

As soon as I plug an nvme into my system I can't boot on zfs root (ZFS enabled
bootstrap loader).  I can load from DVD, and I've since reinstalled onto a
temporary UFS root system and everything works fine.

The system freezes during the BTX loader screen, the drive is given a BIOS
drive letter, then the spinner stops before the "Bios 625kB/3654644kB available
memory" screen.

Some grepping brings me to this loop
https://svnweb.freebsd.org/base/release/10.3.0/sys/boot/i386/loader/main.c?revision=297553&view=markup#l172

Zfs appears to have its own dv_init here:
https://svnweb.freebsd.org/base/release/10.3.0/sys/boot/zfs/zfs.c?revision=297553&view=markup#l385

>From this point I hope someone might have a better idea than printf debugging
:)

The nvme is a Samsung 950 pro, it's in a pcie m2 card. I can dig out exact
model of mount if required.

#nvmecontrol devlist
 nvme0: Samsung SSD 950 PRO 512GB
    nvme0ns1 (488386MB)

# diskinfo -v /dev/nvd0
/dev/nvd0
        512             # sectorsize
        512110190592    # mediasize in bytes (477G)
        1000215216      # mediasize in sectors
        512             # stripesize
        0               # stripeoffset
        S2GMNCAGA01093W # Disk ident.

# pciconf -lv | grep nvme -A3
nvme0 at pci0:3:0:0:       class=0x010802 card=0xa801144d chip=0xa802144d rev=0x01
hdr=0x00
    vendor     = 'Samsung Electronics Co Ltd'
    class      = mass storage
    subclass   = NVM

re severity, I came across someone else with exact same problem on forums.

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