FreeBSD 10.1 i386 encrypted mirrored ZFS root on USB flash drives

[David Christensen]

freebsd-questions:

I did another install, set the protective MBR boot flag on the USB 
drives using Linux fdisk, booted the machine, entered the encryption 
passphrase, and it crashes:

	Enter passphrase for da0p4: GEOM_MIRROR: Force device swap start due to 
timeout.
	
	GEOM_ELI: Device da0p4.eli created
	GEOM_ELI: Encryption: AES-XTS 256
	GEOM_ELI:     Crypto: software
	GEOM_MIRROR: Cancelling unmapped because of da0p3.
	GEOM_MIRROR: Device mirror/swap launched (1/2).
	GEOM_ELI: Device da1p4.eli created.
	GEOM_ELI: Encryption: AES-XTS 256
	GEOM_ELI:     Crypto: software
	Trying to mount root from zfs:cd2533/ROOT/default []...

	Fatal double fault:
	eip = 0xc186ad2e
	esp = 0xea4f2000
	ebp = 0xea4f2360
	cpuid = 0; apic id = 00
	panic: double fault
	cpuid = 0
	KDB: stack backtrace:
	#0 0xc0b53ed2 at kdb_backtrace+0x52
	#1 0xc0b1688f at panic+0x11f
	#2 0xc101bedb at dblfault_handler+0xab


Any ideas?


TIA,

David