Crash in GEOM, booting on Soekris

I am seeing this crash on r271882, booting a Soekris 4501.

POST: 012345689bcefghipsajklnopqr,,,tvwxy

comBIOS ver. 1.33  20080103  Copyright (C) 2000-2007 Soekris Engineering.

net45xx

0064 Mbyte Memory                        CPU Elan SC520 133 Mhz

Pri Mas  SanDisk SDCFX-016G              LBA Xlt 1024--63  15625 Mbyte

Slot   Vend Dev  ClassRev Cmd  Stat CL LT HT  Base1    Base2   Int
-------------------------------------------------------------------
0:00:0 1022 3000 06000000 0006 2280 00 00 00 00000000 00000000
0:18:0 100B 0020 02000000 0107 0290 00 3F 00 0000E001 A0000000 10
0:19:0 100B 0020 02000000 0107 0290 00 3F 00 0000E101 A0001000 11
0:20:0 100B 0020 02000000 0107 0290 00 3F 00 0000E201 A0002000 05

 1 Seconds to automatic boot.   Press Ctrl-P for entering Monitor.
/boot/config: -h

Consoles: serial port
BIOS drive C: is disk0
BIOS 639kB/64512kB available memory

FreeBSD/x86 bootstrap loader, Revision 1.1
(tom_at_bernice, Fri Sep 19 19:39:16 MDT 2014)
Loading /boot/defaults/loader.conf
/boot/kernel/kernel text=0x790cd5 data=0x5e2a0+0x2f0eb8
syms=[0x4+0x89480+0x4+0xebe59]

Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2014 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 11.0-CURRENT #0 r271882M: Fri Sep 19 20:21:03 MDT 2014
    tom_at_bernice:/storage/home/tom/crochet-kientzle/crochet-freebsd/work/obj/i386.i386/storage/home/tom/crochet/src/FreeBSDHead/head/sys/SOEKRIS
i386
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
WARNING: WITNESS option enabled, expect reduced performance.
CPU: AMD Enhanced Am486DX4/Am5x86 Write-Back (486-class CPU)
  Origin="AuthenticAMD"  Id=0x494  Family=0x4  Model=0x9  Stepping=4
  Features=0x1<FPU>
real memory  = 67108864 (64 MB)
avail memory = 47398912 (45 MB)
random device not loaded; using insecure entropy
random: <Software, Yarrow> initialized
module_register_init: MOD_LOAD (vesa, 0xc0a447c0, 0) error 19
kbd1 at kbdmux0
ACPI BIOS Error (bug): A valid RSDP was not found (20130823/tbxfroot-223)
ACPI: Table initialisation failed: AE_NOT_FOUND
ACPI: Try disabling either ACPI or apic support.
sysctl machdep.i8254_freq=1189161 returns 0
Timecounter "ELAN" frequency 8333333 Hz quality 1000
pcib0 pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
sis0: <NatSemi DP8381[56] 10/100BaseTX> port 0xe000-0xe0ff mem
0xa0000000-0xa0000fff irq 10 at device 18.0 on pci0
sis0: Silicon Revision: DP83816A
miibus0: <MII bus> on sis0
nsphyter0: <DP83815 10/100 media interface> PHY 0 on miibus0
nsphyter0:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sis0: Ethernet address: 00:00:24:c8:d4:d4
sis1: <NatSemi DP8381[56] 10/100BaseTX> port 0xe100-0xe1ff mem
0xa0001000-0xa0001fff irq 11 at device 19.0 on pci0
sis1: Silicon Revision: DP83816A
miibus1: <MII bus> on sis1
nsphyter1: <DP83815 10/100 media interface> PHY 0 on miibus1
nsphyter1:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sis1: Ethernet address: 00:00:24:c8:d4:d5
sis2: <NatSemi DP8381[56] 10/100BaseTX> port 0xe200-0xe2ff mem
0xa0002000-0xa0002fff irq 5 at device 20.0 on pci0
sis2: Silicon Revision: DP83816A
miibus2: <MII bus> on sis2
nsphyter2: <DP83815 10/100 media interface> PHY 0 on miibus2
nsphyter2:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sis2: Ethernet address: 00:00:24:c8:d4:d6
cpu0 on motherboard
isa0: <ISA bus> on motherboard
pmtimer0 on isa0
orm0: <ISA Option ROM> at iomem 0xc8000-0xd0fff pnpid ORM0000 on isa0
ata0: <ATA channel> at port 0x1f0-0x1f7,0x3f6 irq 14 on isa0
ata1: <ATA channel> at port 0x170-0x177,0x376 irq 15 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atrtc0: <AT realtime clock> at port 0x70 irq 8 on isa0
Event timer "RTC" frequency 32768 Hz quality 0
attimer0: <AT timer> at port 0x40 on isa0
Timecounter "i8254" frequency 1189161 Hz quality 0
Event timer "i8254" frequency 1189161 Hz quality 100
uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
uart0: console (9600,n,8,1)
uart1: <16550 or compatible> at port 0x2f8-0x2ff irq 3 on isa0
Timecounters tick every 1.000 msec
interrupt storm detected on "irq5:"; throttling interrupt source
Elan-mmcr driver: MMCR at 0xc37ff000.
Elan-mmcr Soekris net45xx comBIOS ver. 1.33 20080103 Copyright (C) 2000-2007
random: unblocking device.
ada0 at ata0 bus 0 scbus0 target 0 lun 0
ada0: <SanDisk SDCFX-016G HDX 7.03> CFA-0 device
ada0: Serial Number AJZ061813191928
ada0: 16.700MB/s transfers (PIO4, PIO 512bytes)
ada0: 15259MB (31250432 512 byte sectors: 16H 63S/T 31002C)
ada0: Previously was known as ad0
panic: Bio not on queue bp=0xc2aaa4c0 target 0xc0c0f8bc
KDB: stack backtrace:
db_trace_self_wrapper(c0b3f07a,c29eb800,c2689be4,c06231d1,c29eb830,...) at
db_trace_self_wrapper+0x2d/frame 0xc2689bb8
kdb_backtrace(c0b3a646,c0c11888,c0b277fe,c2689c70,c0b277fe,...) at
kdb_backtrace+0x30/frame 0xc2689c1c
vpanic(c0c11728,100,c0b277fe,c2689c70,c2689c70,...) at vpanic+0x80/frame
0xc2689c40
kassert_panic(c0b277fe,c2aaa4c0,c0c0f8bc,0,c28cfc40,...) at
kassert_panic+0xe9/frame 0xc2689c64
g_bioq_first(c0c0f8d4,0,c0b275c0,5c,0,...) at g_bioq_first+0x63/frame
0xc2689c80
g_io_schedule_up(c28cfc40,0,c0b27a0d,60,c2689cf4,...) at
g_io_schedule_up+0x94/frame 0xc2689cb4
g_up_procbody(0,c2689d08,c0b33cde,3c9,0,...) at g_up_procbody+0x9d/frame
0xc2689ccc
fork_exit(c0706640,0,c2689d08) at fork_exit+0x7f/frame 0xc2689cf4
fork_trampoline() at fork_trampoline+0x8/frame 0xc2689cf4
--- trap 0, eip = 0, esp = 0xc2689d40, ebp = 0 ---
KDB: enter: panic
[ thread pid 13 tid 100009 ]
Stopped at      kdb_enter+0x3d: movl    $0,kdb_why
db>



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