[Bug 208308] Adding USB flash drive to fstab kills ue0 on Raspberry Pi 2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208308

            Bug ID: 208308
           Summary: Adding USB flash drive to fstab kills ue0 on Raspberry
                    Pi 2
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: dhorton668 at hotmail.com

Created attachment 168654
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168654&action=edit
dmesg output from a successful boot noting differences from hung boot.

I am using FreeBSD-11.0-CURRENT-arm-armv6-RPI2-20160308-r296485.img and
experiencing a problem with USB flash drives and the built-in RPi Ethernet.  In
summary, as soon as I add my USB flash drive to /etc/fstab, the system will
never complete the boot process and ue0 never change the link state.  Once this
happens, disconnecting the flash drive from the RPi and rebooting does not
help.   Only if the flash drive is never added to /etc/fstab, will the system
boot normally.  

I don't recall experiencing this problem when using
FreeBSD-11.0-CURRENT-arm-armv6-RPI2-20160127-r294912.img and wonder if the new
problem may have been introduced by changes made for "Bug 199446 - arm
Raspberry Pi panic without ethernet connected on boot"

Here is how to reproduce it:
1) Install FreeBSD-11.0-CURRENT-arm-armv6-RPI2-20160308-r296485.img
2) Insert a USB flash drive
3) Create a UFS filesystem on da0p1
4) Add /dev/da0p1 to /etc/fstab
5) Restart the Raspberry Pi


Troubleshooting steps I've taken:
Erased (dd if=/dev/zero of=/dev/da0) the flash drive and set up partition
again)
Used different brand of flash drive.
Added the option 'noauto' to fstab.
Used another, known good RPi2.
Used another, known good power supply.
Used another, known good SD card.

None of the above makes a difference and still results in the hung boot.


Additional troubleshooting:
I swapped components (flash drive, power supply, SD card and RPi itself) with a
Linux-based media center.  I cannot reproduce the problem on the media center.


Workaround:
Do not add flash drive to fstab, but mount manually after booting.


I am attaching the dmesg output from a successful boot when the flash drive is
not in fstab.  Unfortunately I cannot include dmesg output from the hung boot,
but I do notice that the 'ue0: link state changed to DOWN' and 'ue0: link state
changed to UP' lines never appear on the screen.

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