[Bug 221075] regression: 11.1 is unable to mount ZFS / on boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221075

--- Comment #13 from seschwar at gmail.com ---
So I had another go at this...

(In reply to Marius Strobl from comment #12)
> (is the card reader you mention a USB one?).

nope:

$ pciconf -lv
(...)
none2 at pci0:11:0:0:  class=0x0c0010 card=0x04a31028 chip=0x11f71217 rev=0x05
hdr=0x00
    vendor     = 'O2 Micro, Inc.'
    device     = 'OZ600 1394a-2000 Controller'
    class      = serial bus
    subclass   = FireWire
none3 at pci0:11:0:1:  class=0x080501 card=0x04a31028 chip=0x83201217 rev=0x05
hdr=0x00
    vendor     = 'O2 Micro, Inc.'
    device     = 'OZ600RJ1/OZ900RJ1 SD/MMC Card Reader Controller'
    class      = base peripheral
    subclass   = SD host controller
none4 at pci0:11:0:2:  class=0x018000 card=0x04a31028 chip=0x83301217 rev=0x05
hdr=0x00
    vendor     = 'O2 Micro, Inc.'
    device     = 'OZ600 MS/xD Controller'
    class      = mass storage

> The one thing that comes to my mind is that since r318197, mmcsd(4) depends
> on geom_flasmap(4) and that the latter might cause some interaction with ZFS.
> (...) One - not necessarily conclusive - way to
> test the theory of interaction between geom_flasmap(4) and ZFS would be to use
> a kernel built from a configuration with mmcsd(4) removed, so this dependency
> isn't dragged in.

Ok, I've build a 11.1 kernel using the following configuration:

$ cat /usr/src/sys/amd64/conf/CUSTOM
include GENERIC
ident CUSTOM
nodevice mmc
nodevice mmcsd
nodevice sdhci

This kernel is indeed capable of mounting the root filesystem on my ZFS pool! 
So your guess that base r318197 is not actually the cause of this, but merely
exposes the issue is probably spot on.

12.0-CURRENT not exhibiting the issue raises the question if the underlying
problem is fixed there, or just happens to not be triggered.  Is there a way
for me to provide more information on this?  Maybe boot with
kern.geom.debugflags set to some appropriate value?

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