SOEKRIS kernel crash

I've compiled a SOEKRIS kernel which I'm booting with Crochet-BSD.  It's
reliably crashing on boot, with the below message.   The kernel revision is
271600, and the kernel config is here:

https://github.com/kientzle/crochet-freebsd/blob/master/board/Soekris/conf/SOEKRIS11


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=0xc2ab74c0 target 0xc0c0f43c

KDB: stack backtrace:

db_trace_self_wrapper(c0b3e6fa,c2a01800,c2689be4,c061fdf1,c2a01830,...) at
db_trace_self_wrapper+0x2d/frame 0xc2689bb8

kdb_backtrace(c0b39cc6,c0c11408,c0b26e7a,c2689c70,c0b26e7a,...) at
kdb_backtrace+0x30/frame 0xc2689c1c

vpanic(c0c112a8,100,c0b26e7a,c2689c70,c2689c70,...) at vpanic+0x80/frame
0xc2689c40

kassert_panic(c0b26e7a,c2ab74c0,c0c0f43c,0,c28d9c40,...) at
kassert_panic+0xe9/frame 0xc2689c64

g_bioq_first(c0c0f454,0,c0b26c3c,5c,0,...) at g_bioq_first+0x63/frame
0xc2689c80

g_io_schedule_up(c28d9c40,0,c0b27089,60,c2689cf4,...) at
g_io_schedule_up+0x94/frame 0xc2689cb4

g_up_procbody(0,c2689d08,c0b3335e,3c9,0,...) at g_up_procbody+0x9d/frame
0xc2689ccc

fork_exit(c0703210,0,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> bt

Tracing pid 13 tid 100009 td 0xc28d9c40

kdb_enter(c0b39f64,c0b39f64,c0b26e7a,c2689c70,c0b26e7a,...) at
kdb_enter+0x3d/frame 0xc2689c1c

vpanic(c0c112a8,100,c0b26e7a,c2689c70,c2689c70,...) at vpanic+0xcb/frame
0xc2689c40

kassert_panic(c0b26e7a,c2ab74c0,c0c0f43c,0,c28d9c40,...) at
kassert_panic+0xe9/frame 0xc2689c64

g_bioq_first(c0c0f454,0,c0b26c3c,5c,0,...) at g_bioq_first+0x63/frame
0xc2689c80

g_io_schedule_up(c28d9c40,0,c0b27089,60,c2689cf4,...) at
g_io_schedule_up+0x94/frame 0xc2689cb4

g_up_procbody(0,c2689d08,c0b3335e,3c9,0,...) at g_up_procbody+0x9d/frame
0xc2689ccc

fork_exit(c0703210,0,c2689d08) at fork_exit+0x7f/frame 0xc2689cf4

fork_trampoline() at fork_trampoline+0x8/frame 0xc2689cf4

--- trap 0, eip = 0, esp = 0xc2689d40, ebp = 0 ---

db>

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