GEOM panic in today's -current

I'll get whatever info someone wants or needs. 
Here, a handwritten  trace of the boot-time panic

db> trace
free()
g_slice_free
g_slice_spoiled()
g_bsd_taste()
g_new_provider_event()
one_event()
g_run_events()
g_event_procbody()
fork_exit()
fork_trampoline

db> call doadump
Dumping 511 MB

Dump failed.  Partition too small.

The dump partition is 1 GB in size, but it is attached
to the ATA controller.  The panic occurs during the
the probing of the acd0.  See dmesg from previous
kernel below. 

-- 
Steve


Copyright (c) 1992-2004 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 5.2-CURRENT #0: Tue Apr 20 12:04:35 PDT 2004
    root_at_dhcp-78-74.apl.washington.edu:/usr/obj/usr/src/sys/MOBILE
Preloaded elf kernel "/boot/kernel.old/kernel" at 0xc07d8000.
Preloaded elf module "/boot/kernel.old/vesa.ko" at 0xc07d81d0.
Preloaded elf module "/boot/kernel.old/snd_pcm.ko" at 0xc07d8280.
Preloaded elf module "/boot/kernel.old/snd_ich.ko" at 0xc07d8330.
Preloaded elf module "/boot/kernel.old/agp.ko" at 0xc07d83e0.
Preloaded elf module "/boot/kernel.old/radeon.ko" at 0xc07d848c.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Mobile Intel(R) Pentium(R) 4 - M CPU 2.00GHz (1994.12-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
  Features=0xbfebf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
real memory  = 536748032 (511 MB)
avail memory = 519688192 (495 MB)
random: <entropy source, Software, Yarrow>
Pentium Pro MTRR support enabled
VESA: v2.0, 16384k memory, flags:0x1, mode table:0xc0780a22 (1000022)
VESA: ATI MOBILITY RADEON 7500
acpi0: <DELL CPi R  > on motherboard
acpi0: [GIANT-LOCKED]
pcibios: BIOS version 2.10
Found $PIR table, 11 entries at 0xc00fbb90
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_tz0: <Thermal Zone> on acpi0
acpi_acad0: <AC Adapter> on acpi0
acpi_cmbat0: <Control Method Battery> on acpi0
acpi_cmbat1: <Control Method Battery> on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_button1: <Sleep Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib0: slot 29 INTA is routed to irq 11
pcib0: slot 31 INTB is routed to irq 11
pcib0: slot 31 INTB is routed to irq 11
agp0: <Intel 82845 host to AGP bridge> mem 0xe8000000-0xebffffff at device 0.0 on pci0
agp0: Reserved 0x4000000 bytes for rid 0x10 type 3 at 0xe8000000
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pcib1: slot 0 INTA is routed to irq 11
drm0: <ATI Radeon LW Mobility 7500 M7> port 0xc000-0xc0ff mem 0xfcff0000-0xfcffffff,0xe0000000-0xe7ffffff irq 11 at device 0.0 on pci1
info: [drm] AGP at 0xe8000000 64MB
info: [drm] Initialized radeon 1.10.0 20020828 on minor 0
uhci0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> port 0xbf80-0xbf9f irq 11 at device 29.0 on pci0
uhci0: Reserved 0x20 bytes for rid 0x20 type 4 at 0xbf80
uhci0: [GIANT-LOCKED]
usb0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
pcib2: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci2: <ACPI PCI bus> on pcib2
pcib2: slot 0 INTA is routed to irq 11
xl0: <3Com 3c905C-TX Fast Etherlink XL> port 0xec80-0xecff mem 0xf8fffc00-0xf8fffc7f irq 11 at device 0.0 on pci2
xl0: Reserved 0x80 bytes for rid 0x14 type 3 at 0xf8fffc00
miibus0: <MII bus> on xl0
ukphy0: <Generic IEEE 802.3u media interface> on miibus0
ukphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
xl0: Ethernet address: 00:08:74:99:7c:c5
xl0: [GIANT-LOCKED]
cbb0: <TI1420 PCI-CardBus Bridge> at device 1.0 on pci2
cbb0: Lazy allocation of 0x1000 bytes rid 0x10 type 3 at 0xf4000000
cardbus0: <CardBus bus> on cbb0
pccard0: <16-bit PCCard bus> on cbb0
pcib2: slot 1 INTA is routed to irq 11
cbb1: <TI1420 PCI-CardBus Bridge> at device 1.1 on pci2
cbb1: Lazy allocation of 0x1000 bytes rid 0x10 type 3 at 0xf4001000
cardbus1: <CardBus bus> on cbb1
pccard1: <16-bit PCCard bus> on cbb1
pcib2: slot 1 INTA is routed to irq 11
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH3 UDMA100 controller> port 0xbfa0-0xbfaf,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 at device 31.1 on pci0
atapci0: Reserved 0x10 bytes for rid 0x20 type 4 at 0xbfa0
atapci0: Reserved 0x8 bytes for rid 0x10 type 4 at 0x1f0
atapci0: Reserved 0x4 bytes for rid 0x14 type 4 at 0x3f4
ata0: at 0x1f0 irq 14 on atapci0
atapci0: Reserved 0x8 bytes for rid 0x18 type 4 at 0x170
atapci0: Reserved 0x4 bytes for rid 0x1c type 4 at 0x374
ata1: at 0x170 irq 15 on atapci0
pcm0: <Intel ICH3 (82801CA)> port 0xdc80-0xdcbf,0xd800-0xd8ff irq 11 at device 31.5 on pci0
pcm0: Reserved 0x100 bytes for rid 0x10 type 4 at 0xd800
pcm0: Reserved 0x40 bytes for rid 0x14 type 4 at 0xdc80
pcm0: [GIANT-LOCKED]
pcm0: <Cirrus Logic CS4205 AC97 Codec>
pci0: <simple comms> at device 31.6 (no driver attached)
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model Generic PS/2 mouse, device ID 0
fdc0: cannot reserve I/O port range (1 ports)
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
ppc0 port 0x778-0x77b,0x378-0x37f irq 7 drq 3 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
fdc0: cannot reserve I/O port range (1 ports)
cpu0 on motherboard
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
pmtimer0 on isa0
orm0: <Option ROMs> at iomem 0xcf800-0xcffff,0xcf000-0xcf7ff,0xc0000-0xcefff on isa0
sc0: <System console> on isa0
sc0: VGA <8 virtual consoles, flags=0x200>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
fdc0: cannot reserve I/O port range (6 ports)
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
Timecounter "TSC" frequency 1994122768 Hz quality 800
Timecounters tick every 10.000 msec
acpi_cpu: throttling enabled, 8 steps (100% to 12.5%), currently 100.0%
ad0: 38154MB <IC25N040ATCS05-0> [77520/16/63] at ata0-master UDMA100

The panic occurs at this point.

ata1-slave: FAILURE - ATAPI_IDENTIFY no interrupt
ata1-slave: FAILURE - ATAPI_IDENTIFY no interrupt
acd0: DVDROM <HL-DT-STDVD-ROM GDR8081N> at ata1-master WDMA2
Mounting root from ufs:/dev/ad0s3a