[Bug 215459] Installing card reader causes bootloader to fail with BTX Halted

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215459

            Bug ID: 215459
           Summary: Installing card reader causes bootloader to fail with
                    BTX Halted
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fmatthew5876 at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 178164
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178164&action=edit
screenshot of crash

This bug is occuring on this hardware:

- Supermicro X11SAT-F motherboard
- Sky Intel Xeon CPU

I have an aft xm-37u usb 3.0 card reader.

http://www.kioskreader.com/products-xm37u

This card reader seems to work fine if I connect it to the system after I've
booted.

When I plug this card reader into one of the internal ports of my motherboard
and try to boot the system however, I get a crash in the boot loader. If I
remove this device, the system boots fine. I'm using 2 ssds mirrored in zfs as
my boot drives on the motherboard's internal sata ports.

First, I see a bunch of gptzfsboot errors like the below:

gptzfsboot error 49 lba 1
gptzfsboot error 49 lba 32
gptzfsboot error 49 lba 1
gptzfsboot error 49 lba 32
gptzfsboot error 49 lba 1
gptzfsboot error 49 lba 32
gptzfsboot error 49 lba 1
gptzfsboot error 49 lba 32
gptzfsboot error 49 lba 1
gptzfsboot error 49 lba 32

and then finally ending in a crash with BTX halted (see attached screenshot).

When I plug in the device, I see all of the various sd card ports show up as 5
bootable drives in the BIOS. You can also see the in the screenshot that the
bootloader has detected 14 BIOS drives, whereas normally this system has only
9.

I suspect perhaps the bootloader is somehow getting confused by the presence of
these extra drives? I'm pretty sure those 5 pairs of gptzfsboot errors must be
getting triggered from the 5 bios drives of the card reader. 

I also tried inserting an sd card into one of the slots of the card reader and
rebooting. With the sd card inserted, I get only 4 pairs of gptzfsboot errors
instead of 5! Maybe the error is being caused by these memory card ports not
having actual disks in them and that is somehow confusing the bootloader?

Also the card reader appears to work fine if plugged in after booting, so the
error must be solely related to the bootloader and its interaction with the
bios.

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