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amd64 kernel crash
Got the following crash on a recent (current as of 2008-09-20 21:18:14)
4.99.72 kernel. Nothing special was happening at the time, just a
normal 'build.sh -j 8 release'. Kernel config and dmesg are attached.
This is similar to the "random" crashes that I've previously attributed
to having "too much memory" (8GB total), but the kernel is built with
options PHYSMEM_MAX_ADDR=4096
so that shouldn't be an issue.
(gdb) bt
#0 0xffffffff8032ef3a in cpu_reboot (howto=260, bootstr=<value
optimized out>)
at /build/src/sys/arch/amd64/amd64/machdep.c:654
#1 0xffffffff8029999b in panic (fmt=0xffffffff804614a0 "trap")
at /build/src/sys/kern/subr_prf.c:258
#2 0xffffffff80330794 in trap (frame=0xffff80004d5f9370)
at /build/src/sys/arch/amd64/amd64/trap.c:254
#3 0xffffffff80101002 in calltrap ()
#4 0xffffffff8029886b in kprintf (fmt0=0x0, oflags=Cannot access memory
at address 0xffffffffffffff7c)
at /build/src/sys/kern/subr_prf.c:1463
Previous frame inner to this frame (corrupt stack?)
(gdb)
Any clues on how to dig deeper into this would be appreciated. I've got
the whole 3.2GB dump file...
----------------------------------------------------------------------
| Paul Goyette | PGP DSS Key fingerprint: | E-mail addresses: |
| Customer Service | FA29 0E3B 35AF E8AE 6651 | paul%whooppee.com@localhost |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette%juniper.net@localhost |
----------------------------------------------------------------------
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007, 2008
The NetBSD Foundation, Inc. All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
NetBSD 4.99.72 (SPEEDY (ASUS M2N-E) 2008-09-20 21:18:14) #0: Sat Sep 20
14:36:00 PDT 2008
paul%speedy.whooppee.com@localhost:/build/obj/amd64/sys/arch/amd64/compile/SPEEDY
total memory = 3070 MB
avail memory = 2967 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
SMBIOS rev. 2.4 @ 0xf0000 (72 entries)
System manufacturer System Product Name (System Version)
mainbus0 (root)
cpu0 at mainbus0 apid 0: AMD 686-class, 2310MHz, id 0x100f22
cpu0: erratum 298 present
cpu0: erratum 298 present
cpu0: erratum 309 present
cpu0: WARNING: errata present, BIOS upgrade may be
cpu0: WARNING: necessary to ensure reliable operation
cpu1 at mainbus0 apid 1: AMD 686-class, 2310MHz, id 0x100f22
cpu2 at mainbus0 apid 2: AMD 686-class, 2310MHz, id 0x100f22
cpu3 at mainbus0 apid 3: AMD 686-class, 2310MHz, id 0x100f22
ioapic0 at mainbus0 apid 4: pa 0xfec00000, version 11, 24 pins
acpi0 at mainbus0: Intel ACPICA 20080321
acpi0: X/RSDT: OemId <Nvidia,ASUSACPI,42302e31>, AslId <AWRD,00000000>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present
timecounter: Timecounter "ACPI-Fast" frequency 3579545 Hz quality 1000
ACPI-Fast 24-bit timer
acpibut0 at acpi0 (PWRB, PNP0C0C): ACPI Power Button
attimer0 at acpi0 (TMR, PNP0100): AT Timer
attimer0: io 0x40-0x43
hpet0 at acpi0 (HPET, PNP0103)
hpet0: mem 0xfefff000-0xfefff3ff irq 0,8
timecounter: Timecounter "hpet0" frequency 25000000 Hz quality 2000
pcppi0 at acpi0 (SPKR, PNP0800)
pcppi0: io 0x61
midi0 at pcppi0: PC speaker (CPU-intensive output)
sysbeep0 at pcppi0
FDC0 (PNP0700) at acpi0 not configured
com0 at acpi0 (UAR1, PNP0501-1)
com0: io 0x3f8-0x3ff irq 4
com0: ns16550a, working fifo
lpt0 at acpi0 (LPT1, PNP0400-1)
lpt0: io 0x378-0x37f irq 7
aiboost0 at acpi0 (ASOC, ATK0110-16843024)
aiboost0: ASUS AI Boost Hardware monitor
FAN (PNP0C0B) at acpi0 not configured
acpitz0 at acpi0 (THRM): active cooling level 0: 73.0C critical 75.0C passive
40.0C
attimer0: attached to pcppi0
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
vendor 0x10de product 0x0369 (RAM memory, revision 0xa2) at pci0 dev 0 function
0 not configured
pcib0 at pci0 dev 1 function 0
pcib0: vendor 0x10de product 0x0360 (rev. 0xa3)
nfsmbc0 at pci0 dev 1 function 1: vendor 0x10de product 0x0368 (rev. 0xa3)
nfsmb0 at nfsmbc0 SMBus 1
iic0 at nfsmb0: I2C bus
iic0: devices at 0x50 0x51 0x52 0x53
spdmem0 at iic0 addr 0x50
spdmem0: DDR2 SDRAM memory, no parity or ECC, 2048MB, 800MHz (PC2-6400)
spdmem0: 14 rows, 10 cols, 2 ranks, 8 banks/chip, 2.50ns cycle time
spdmem0: tAA-tRCD-tRP-tRAS: 5-5-5-18
spdmem0: voltage SSTL 1.8V, refresh time 7.8us (self-refreshing)
spdmem1 at iic0 addr 0x51
spdmem1: DDR2 SDRAM memory, no parity or ECC, 2048MB, 800MHz (PC2-6400)
spdmem1: 14 rows, 10 cols, 2 ranks, 8 banks/chip, 2.50ns cycle time
spdmem1: tAA-tRCD-tRP-tRAS: 5-5-5-18
spdmem1: voltage SSTL 1.8V, refresh time 7.8us (self-refreshing)
spdmem2 at iic0 addr 0x52
spdmem2: DDR2 SDRAM memory, no parity or ECC, 2048MB, 800MHz (PC2-6400)
spdmem2: 14 rows, 10 cols, 2 ranks, 8 banks/chip, 2.50ns cycle time
spdmem2: tAA-tRCD-tRP-tRAS: 5-5-5-18
spdmem2: voltage SSTL 1.8V, refresh time 7.8us (self-refreshing)
spdmem3 at iic0 addr 0x53
spdmem3: DDR2 SDRAM memory, no parity or ECC, 2048MB, 800MHz (PC2-6400)
spdmem3: 14 rows, 10 cols, 2 ranks, 8 banks/chip, 2.50ns cycle time
spdmem3: tAA-tRCD-tRP-tRAS: 5-5-5-18
spdmem3: voltage SSTL 1.8V, refresh time 7.8us (self-refreshing)
nfsmb1 at nfsmbc0 SMBus 2
iic1 at nfsmb1: I2C bus
iic1: devices at 0x0c 0x2e
dbcool0 at iic1 addr 0x2e
dbcool0: ADT7475 dBCool(tm) Controller (rev 0x0069)
ohci0 at pci0 dev 2 function 0: vendor 0x10de product 0x036c (rev. 0xa1)
APCF: Picked IRQ 20 with weight 0
ohci0: interrupting at ioapic0 pin 20
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
ehci0 at pci0 dev 2 function 1: vendor 0x10de product 0x036d (rev. 0xa2)
APCL: Picked IRQ 21 with weight 0
ehci0: interrupting at ioapic0 pin 21
ehci0: EHCI version 1.0
ehci0: companion controller, 10 ports each: ohci0
usb1 at ehci0: USB revision 2.0
viaide0 at pci0 dev 4 function 0
viaide0: NVIDIA MCP55 IDE Controller (rev. 0xa1)
viaide0: bus-master DMA support present
viaide0: primary channel configured to compatibility mode
viaide0: primary channel interrupting at ioapic0 pin 14
atabus0 at viaide0 channel 0
viaide0: secondary channel configured to compatibility mode
viaide0: secondary channel ignored (disabled)
viaide1 at pci0 dev 5 function 0
viaide1: NVIDIA MCP55 Serial ATA Controller (rev. 0xa3)
viaide1: bus-master DMA support present
viaide1: primary channel wired to native-PCI mode
APSI: Picked IRQ 22 with weight 0
viaide1: using ioapic0 pin 22 for native-PCI interrupt
atabus1 at viaide1 channel 0
viaide1: secondary channel wired to native-PCI mode
atabus2 at viaide1 channel 1
viaide2 at pci0 dev 5 function 1
viaide2: NVIDIA MCP55 Serial ATA Controller (rev. 0xa3)
viaide2: bus-master DMA support present
viaide2: primary channel wired to native-PCI mode
APSJ: Picked IRQ 23 with weight 0
viaide2: using ioapic0 pin 23 for native-PCI interrupt
atabus3 at viaide2 channel 0
viaide2: secondary channel wired to native-PCI mode
atabus4 at viaide2 channel 1
viaide3 at pci0 dev 5 function 2
viaide3: NVIDIA MCP55 Serial ATA Controller (rev. 0xa3)
viaide3: bus-master DMA support present
viaide3: primary channel wired to native-PCI mode
ASA2: Picked IRQ 20 with weight 1
viaide3: using ioapic0 pin 20 for native-PCI interrupt
atabus5 at viaide3 channel 0
viaide3: secondary channel wired to native-PCI mode
atabus6 at viaide3 channel 1
ppb0 at pci0 dev 6 function 0: vendor 0x10de product 0x0370 (rev. 0xa2)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
azalia0 at pci0 dev 6 function 1: Generic High Definition Audio Controller
AAZA: Picked IRQ 21 with weight 1
azalia0: interrupting at ioapic0 pin 21
azalia0: host: 0x10de/0x0371 (rev. 162), HDA rev. 1.0
nfe0 at pci0 dev 8 function 0: vendor 0x10de product 0x0373 (rev. 0xa3)
APCH: Picked IRQ 22 with weight 1
nfe0: interrupting at ioapic0 pin 22
nfe0: Ethernet address 00:1e:8c:3e:2b:95
makphy0 at nfe0 phy 1: Marvell 88E1116 Gigabit PHY, rev. 1
makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,
1000baseT-FDX, auto
ppb1 at pci0 dev 15 function 0: vendor 0x10de product 0x0377 (rev. 0xa3)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled, rd/line, wr/inv ok
vga0 at pci2 dev 0 function 0: vendor 0x1002 product 0x9588 (rev. 0x00)
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0
drm at vga0 not configured
azalia1 at pci2 dev 0 function 1: Generic High Definition Audio Controller
APC7: Picked IRQ 16 with weight 0
azalia1: interrupting at ioapic0 pin 16
azalia1: host: 0x1002/0xaa08 (rev. 0), HDA rev. 1.0
pchb0 at pci0 dev 24 function 0
pchb0: vendor 0x1022 product 0x1200 (rev. 0x00)
pchb1 at pci0 dev 24 function 1
pchb1: vendor 0x1022 product 0x1201 (rev. 0x00)
pchb2 at pci0 dev 24 function 2
pchb2: vendor 0x1022 product 0x1202 (rev. 0x00)
amdtemp0 at pci0 dev 24 function 3
amdtemp0: AMD CPU Temperature Sensors (Family10h / Family11h)
pchb4 at pci0 dev 24 function 4
pchb4: vendor 0x1022 product 0x1204 (rev. 0x00)
isa0 at pcib0
pckbc1 at isa0 port 0x60-0x64
pckbd0 at pckbc1 (kbd slot)
pckbc1: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
itesio0 at isa0 port 0x2e-0x2f: iTE IT8716F Super I/O (rev 1)
itesio0: Hardware Monitor registers at 0x290
itesio0: Watchdog Timer present
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
timecounter: Timecounter "TSC" frequency 2310795980 Hz quality 3000
azalia0: codec[0]: Analog Devices AD1988B (rev. 4.0), HDA rev. 1.0
audio0 at azalia0: full duplex, independent
azalia1: codec[0]: ATI R600 HDMI (rev. 0.0), HDA rev. 1.0
audio1 at azalia1: full duplex, independent
uhub0 at usb0: vendor 0x10de OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 10 ports with 10 removable, self powered
uhub1 at usb1: vendor 0x10de EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub1: 10 ports with 10 removable, self powered
viaide2 port 1: device present, speed: 3.0Gb/s
ehci0: handing over low speed device on port 4 to ohci0
wd0 at atabus4 drive 0: <WDC WD5000AAKS-00TMA0>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 465 GB, 969021 cyl, 16 head, 63 sec, 512 bytes/sect x 976773168 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(viaide2:1:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
pad0: outputs: 44100Hz, 16-bit, stereo
audio2 at pad0: half duplex
boot device: wd0
root on wd0a dumps on wd0b
uhidev0 at uhub0 port 4 configuration 1 interface 0
uhidev0: Justcom Technology USB KVM Switch, rev 1.10/1.00, addr 2, iclass 3/1
ukbd0 at uhidev0: 8 modifier keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub0 port 4 configuration 1 interface 1
uhidev1: Justcom Technology USB KVM Switch, rev 1.10/1.00, addr 2, iclass 3/1
ums0 at uhidev1: 5 buttons and Z dir.
wsmouse0 at ums0 mux 0
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)
Accounting started
include "arch/amd64/conf/std.amd64"
options INCLUDE_CONFIG_FILE # embed config file in kernel binary
#ident "GENERIC-$Revision: 1.226 $"
ident "SPEEDY (ASUS M2N-E) 2008-09-28 04:50:35"
maxusers 64 # estimated number of users
options INSECURE # disable kernel security levels - X needs this
options RTC_OFFSET=0 # hardware clock is this many mins. west of GMT
options NTP # NTP phase/frequency locked loop
options KTRACE # system call tracing via ktrace(1)
#options SYSTRACE # system call vetting via systrace(1)
options SYSVMSG # System V-like message queues
options SYSVSEM # System V-like semaphores
options SYSVSHM # System V-like memory sharing
#options SHMMAXPGS=2048 # 2048 pages is the default
options P1003_1B_SEMAPHORE
options LKM # loadable kernel modules
options MODULAR
options MEMORY_DISK_HOOKS
options MEMORY_DISK_DYNAMIC
options WAPBL # File system journaling
options VGA_POST
options USERCONF # userconf(4) support
options SYSCTL_INCLUDE_DESCR # Include sysctl descriptions in kernel
options POWERNOW_K8
options SOFTDEP # FFS soft updates support.
options QUOTA # UFS quotas
options NFSSERVER # Network File System server
options EXEC_ELF32
options COMPAT_NETBSD32
options COMPAT_BSDPTY # /dev/[pt]ty?? ptys.
options COMPAT_40
options DIAGNOSTIC # expensive kernel consistency checks
#options DEBUG # expensive debugging checks/support
options KMEMSTATS # kernel memory statistics (vmstat -m)
# Because gcc omits the frame pointer for any -O level, the line below
# is needed to make backtraces in DDB work.
#
makeoptions COPTS="-O2 -fno-omit-frame-pointer"
options DDB # in-kernel debugger
#options DDB_ONPANIC=1 # see also sysctl(8): `ddb.onpanic'
options DDB_HISTORY_SIZE=512 # enable history editing in DDB
#options KGDB # remote debugger
#options KGDB_DEVNAME="\"com\"",KGDB_DEVADDR=0x3f8,KGDB_DEVRATE=9600
makeoptions DEBUG="-g" # compile full symbol table
# File systems
file-system FFS # UFS
file-system MFS # memory file system
file-system NFS # Network File System client
file-system CD9660 # ISO 9660 + Rock Ridge file system
file-system MSDOSFS
file-system FDESC # /dev/fd
file-system KERNFS # /kern
file-system NULLFS # loopback file system
file-system PROCFS # /proc
file-system PTYFS # /dev/pts/N support
file-system TMPFS # Efficient memory file-system
# Networking options
options GATEWAY # packet forwarding
options INET # IP + ICMP + TCP + UDP
options PFIL_HOOKS # pfil(9) packet filter hooks
options IPFILTER_LOG # ipmon(8) log support
options IPFILTER_LOOKUP # ippool(8) support
#options IPFILTER_DEFAULT_BLOCK # block all packets by default
# These options enable verbose messages for several subsystems.
# Warning, these may compile large string tables into the kernel!
#options ACPIVERBOSE # verbose ACPI configuration messages
#options MIIVERBOSE # verbose PHY autoconfig messages
#options PCIVERBOSE # verbose PCI device autoconfig messages
#options SCSIVERBOSE # human readable SCSI error messages
#options USBVERBOSE # verbose USB device autoconfig messages
#
# wscons options
#
options WSEMUL_VT100 # VT100 / VT220 emulation
options WS_KERNEL_FG=WSCOL_GREEN
options WSDISPLAY_COMPAT_PCVT # emulate some ioctls
options WSDISPLAY_COMPAT_SYSCONS # emulate some ioctls
options WSDISPLAY_COMPAT_USL # VT handling
options WSDISPLAY_COMPAT_RAWKBD # can get raw scancodes
options PCDISPLAY_SOFTCURSOR
options WSDISPLAY_SCROLLSUPPORT
config netbsd root on wd0a type ffs
#
# Pseudo-Devices
#
# accept filters
pseudo-device accf_data # "dataready" accept filter
pseudo-device accf_http # "httpready" accept filter
# crypto pseudo-devices
pseudo-device crypto # /dev/crypto device
pseudo-device swcrypto # software crypto implementation
# disk/mass storage pseudo-devices
pseudo-device cgd 4 # cryptographic disk devices
#pseudo-device fss 4 # file system snapshot device
pseudo-device md 1 # memory disk device (ramdisk)
pseudo-device vnd # disk-like interface to files
#options VND_COMPRESSION # compressed vnd(4)
# network pseudo-devices
pseudo-device bpfilter # Berkeley packet filter
pseudo-device ipfilter # IP filter (firewall) and NAT
pseudo-device loop # network loopback
# miscellaneous pseudo-devices
pseudo-device pty # pseudo-terminals
pseudo-device sequencer 1 # MIDI sequencer
pseudo-device rnd # /dev/random and in-kernel generator
pseudo-device clockctl # user control of clock subsystem
pseudo-device ksyms # /dev/ksyms
#pseudo-device pf # PF packet filter
#pseudo-device pflog # PF log if
pseudo-device lockstat
pseudo-device drvctl
pseudo-device pad
# wscons pseudo-devices
pseudo-device wsmux # mouse & keyboard multiplexor
pseudo-device wsfont
options PAX_MPROTECT=0 # PaX mprotect(2) restrictions
options PAX_ASLR=0 # PaX Address Space Layout Randomization
options DKWEDGE_AUTODISCOVER
options DKWEDGE_METHOD_GPT
#
# Device configuration
#
# Mainbus configuration
mainbus0 at root
cpu0 at mainbus0
cpu1 at mainbus0
cpu2 at mainbus0
cpu3 at mainbus0
ioapic0 at mainbus0
acpi0 at mainbus0
options ACPI_SCANPCI
pci0 at mainbus0 bus 0
pci1 at ppb0 bus 1
pci2 at ppb1 bus 2
# ACPI devices (includes formerly-isa stuff!)
hpet0 at acpi0
aiboost0 at acpi0
acpibut0 at acpi0 # ACPI Button
acpitz0 at acpi0 # ACPI Thermal Zone
com0 at acpi0
lpt0 at acpi0
attimer0 at acpi0
acpiec0 at acpi0 # ACPI Embedded Controller (late binding)
acpiecdt0 at acpi0 # ACPI Embedded Controller (early binding)
pckbc0 at acpi0
#fdc0 at acpi0
#fd0 at fdc0
#npx0 at acpi0
pcppi0 at acpi0
midi0 at pcppi0
sysbeep0 at pcppi0
# PCI Bus configuration
amdtemp* at pci? dev ? function ? # XXX
pcib0 at pci0 dev 1 function 0
nfsmbc0 at pci0 dev 1 function 1
nfsmb0 at nfsmbc0
iic0 at nfsmb0
nfsmb1 at nfsmbc0
iic1 at nfsmb1
ohci0 at pci0 dev 2 function 0
ehci0 at pci0 dev 2 function 1
viaide0 at pci0 dev 4 function 0
viaide1 at pci0 dev 5 function 0
viaide2 at pci0 dev 5 function 1
viaide3 at pci0 dev 5 function 2
ppb0 at pci0 dev 6 function 0
azalia0 at pci0 dev 6 function 1
nfe0 at pci0 dev 8 function 0
makphy0 at nfe0 phy 1
ppb1 at pci0 dev 15 function 0
azalia1 at pci2 dev 0 function 1
pchb0 at pci0 dev 24 function 0
pchb1 at pci0 dev 24 function 1
pchb2 at pci0 dev 24 function 2
pchb3 at pci0 dev 24 function 3
pchb4 at pci0 dev 24 function 4
vga0 at pci2 dev 0 function 0
wsdisplay0 at vga0 kbdmux 1
#drm0 at vga0
isa0 at pcib0
itesio0 at isa0 port 0x2e
audio0 at azalia0
audio1 at azalia1
audio2 at pad0
# IDE Disk/CD/Tape configuration
atabus0 at viaide0 channel 0
atabus1 at viaide1 channel 0
atabus2 at viaide1 channel 1
atabus3 at viaide2 channel 0
atabus4 at viaide2 channel 1
atabus5 at viaide3 channel 0
atabus6 at viaide3 channel 1
wd0 at atabus4 drive 0
wd* at atabus? drive ?
# USB keyboard, mouse, and printer
usb0 at ohci0
uhub0 at usb0
usb1 at ehci0
uhub1 at usb1
uhub* at uhub? port ?
uhidev* at uhub? port ? configuration ? interface ?
ukbd* at uhidev? reportid ?
wskbd* at ukbd? console ? mux 1
ums* at uhidev? reportid ?
wsmouse* at ums? mux 0
ulpt* at uhub? port ? configuration ? interface ?
uhid* at uhidev? reportid ?
ugen* at uhub? port ?
options UGEN_BULK_RA_WB # Read-ahead/write-behind on ugen bulk endpts
umass* at uhub? port ? configuration ? interface ?
scsibus* at umass?
sd* at scsibus?
# PS/2 keyboard and mouse
pckbc* at isa0
pckbd* at pckbc?
wskbd* at pckbd? mux 1
pms* at pckbc?
wsmouse* at pms? mux 0
# NVIDIA nForce2/3/4 SMBus controller
spdmem0 at iic0 addr 0x50
spdmem1 at iic0 addr 0x51
spdmem2 at iic0 addr 0x52
spdmem3 at iic0 addr 0x53
dbcool0 at iic1 addr 0x2e
options I2C_SCAN # See what else might be there
options DDB_ONPANIC=0
options DDB_COMMANDONENTER="call ddb_vgapost; bt"
# Temporary, until bounce-buffers are fixed
options PHYSMEM_MAX_ADDR=4096
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