On 05/18/11 18:32, Ariane van der Steldt wrote:
> It turns out that on sparc64, doing something like
> show map /f *kernel_map
> in ddb, makes you crash with a nullpointer exception.
> Diff below makes sure we read all bytes of the pointer. The int in the
> original code also explains why amd64 (little-endian arch) never had a
> problem.
>
> To test this, drop into ddb and type
> show map /f *kernel_map
> Without this diff, any big-endian 64-bit arch should have a null-pointer
> excepction.
> With this diff applied, the kernel allocation map should be printed.
>
> Please test the above to confirm this (I don't have the hardware here).
> PS, unmount your filesystems before testing!
>
> Ok?
Works for me on amd64.
Before:
ddb{0}> show map /f *kernel_map
show map /f *kernel_map
kernel: page fault trap, code=0
Faulted in DDB; continuing...
ddb{0}> boot reboot
boot reboot
rebooting...
After:
# sysctl -w ddb.trigger=1
sysctl -w ddb.trigger=1
Stopped at Debugger+0x5: leave
ddb{1}> show map /f *kernel_map
show map /f *kernel_map
MAP 0xffffffff80cf6780: [0xffff800000000000->0xffff800100000000]
#ent=12, sz=246595584, ref=1, version=2280, flags=0x1
pmap=0xffffffff80d5c6a0(resident=511)
- 0xffffffff80d1a7d0: 0xffff800000000000->0xffff800000013000: obj=0x0/0x0,
amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xffffffff80d1a740: 0xffff800000013000->0xffff800008013000:
obj=0xffffffff80cceaa0/0x0, amap=0x0/0
submap=T, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xffffffff80d1a6b0: 0xffff800008013000->0xffff800008133000:
obj=0xffffffff80cf6740/0x8013000, amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xffffffff80d1a590: 0xffff800008133000->0xffff800008533000:
obj=0xffff800000014f00/0x0, amap=0x0/0
submap=T, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xffffffff80d1a500: 0xffff800008533000->0xffff80000865f000:
obj=0xffff800000014e00/0x0, amap=0x0/0
submap=T, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xffffffff80d1a470: 0xffff80000865f000->0xffff80000e89f000: obj=0x0/0x0,
amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=0/0, inh=2, wc=0, adv=0
- 0xffffffff80d1a350: 0xffff80000e89f000->0xffff80000e8ab000:
obj=0xffffffff80cf6740/0xe89f000, amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xffffffff80d1a3e0: 0xffff80000e8ab000->0xffff80000e8ab040:
obj=0xffffffff80cf6740/0xe8ab000, amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=7/7, inh=2, wc=1, adv=1
- 0xffffffff80d1a230: 0xffff80000e8ab040->0xffff80000e8af000:
obj=0xffffffff80cf6740/0xe8ab040, amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xffffffff80d1a1a0: 0xffff80000e8af000->0xffff80000eac8000:
obj=0xffffffff80cf6740/0xe8af000, amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=7/7, inh=2, wc=0, adv=1
- 0xfffffe803fe2f1b0: 0xffff80000eac8000->0xffff80000eb18000:
obj=0xffffffff80cf6740/0xeac8000, amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=3/3, inh=2, wc=0, adv=1
- 0xfffffe803fe2f6c0: 0xffff80000eb5a000->0xffff80000eb6e000:
obj=0xffffffff80cf6740/0xeb5a000, amap=0x0/0
submap=F, cow=F, nc=F, prot(max)=3/3, inh=2, wc=0, adv=1
ddb{1}> boot reboot
boot reboot
rebooting...
booting hd0a:bsd.ddbfix: 5612792+1596908+944936+0+628256
[89+496392+319941]=0xd28e90
entry point at 0x1001e0 [7205c766, 34000004, 24448b12, 8c58a304]
[ using 817264 bytes of bsd ELF symbol table ]
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
Copyright (c) 1995-2011 OpenBSD. All rights reserved. http://www.OpenBSD.org
OpenBSD 4.9-current (GENERIC.MP) #21: Thu May 19 00:36:11 EDT 2011
r...@x2.thrush.com:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 1072627712 (1022MB)
avail mem = 1030017024 (982MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.5 @ 0xe1000 (5 entries)
bios0: vendor innotek GmbH version "VirtualBox" date 12/01/2006
bios0: innotek GmbH VirtualBox
acpi0 at bios0: rev 2
acpi0: sleep states S0 S5
acpi0: tables DSDT FACP APIC SSDT
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 32 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: AMD Phenom(tm) 9550 Quad-Core Processor, 2191.01 MHz
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,NXE,FFXSR,LONG,3DNOW2,3DNOW
cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line
16-way L2 cache
cpu0: ITLB 32 4KB entries fully associative, 16 4MB entries fully associative
cpu0: DTLB 48 4KB entries fully associative, 48 4MB entries fully associative
cpu0: apic clock running at 999MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: AMD Phenom(tm) 9550 Quad-Core Processor, 2190.72 MHz
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,NXE,FFXSR,LONG,3DNOW2,3DNOW
cpu1: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 64b/line
16-way L2 cache
cpu1: ITLB 32 4KB entries fully associative, 16 4MB entries fully associative
cpu1: DTLB 48 4KB entries fully associative, 48 4MB entries fully associative
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 11, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 2
acpiprt0 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0
acpicpu1 at acpi0
acpibat0 at acpi0: BAT0 not present
acpiac0 at acpi0: AC unit online
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00
pciide0 at pci0 dev 1 function 1 "Intel 82371AB IDE" rev 0x01: DMA, channel 0
configured to compatibility, channel 1 configured to compatibility
pciide0: channel 0 disabled (no drives)
atapiscsi0 at pciide0 channel 1 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <VBOX, CD-ROM, 1.0> ATAPI 5/cdrom removable
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2
vga1 at pci0 dev 2 function 0 "InnoTek VirtualBox Graphics Adapter" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
em0 at pci0 dev 3 function 0 "Intel PRO/1000MT (82540EM)" rev 0x02: apic 2 int
19, address 08:00:27:14:ce:ca
"InnoTek VirtualBox Guest Service" rev 0x00 at pci0 dev 4 function 0 not
configured
auich0 at pci0 dev 5 function 0 "Intel 82801AA AC97" rev 0x01: apic 2 int 21,
ICH AC97
ac97: codec id 0x83847600 (SigmaTel STAC9700)
audio0 at auich0
ohci0 at pci0 dev 6 function 0 "Apple Intrepid USB" rev 0x00: apic 2 int 22,
version 1.0
piixpm0 at pci0 dev 7 function 0 "Intel 82371AB Power" rev 0x08: SMBus disabled
ehci0 at pci0 dev 11 function 0 "Intel 82801FB USB" rev 0x00: apic 2 int 19
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ahci0 at pci0 dev 13 function 0 "Intel 82801HBM AHCI" rev 0x02: apic 2 int 21,
AHCI 1.1
ahci0: device on port 0 didn't come ready, TFD: 0x171<ERR>
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, VBOX HARDDISK, 1.0> SCSI3 0/direct fixed
t10.ATA_VBOX_HARDDISK_VB7c6c1ac7-21c49bfd_
sd0: 30720MB, 512 bytes/sec, 62914560 sec total
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: console
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
usb1 at ohci0: USB revision 1.0
uhub1 at usb1 "Apple OHCI root hub" rev 1.00/1.00 addr 1
mtrr: CPU supports MTRRs but not enabled
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
root on sd0a (96fa835758f5cab4.a) swap on sd0b dump on sd0b
setting tty flags
pf enabled
ddb.console: 1 -> 1
ddb.max_line: 24 -> 0
machdep.allowaperture: 0 -> 2
machdep.kbdreset: 0 -> 1
kern.bufcachepercent: 10 -> 90
starting network
DHCPREQUEST on em0 to 255.255.255.255 port 67
DHCPACK from 10.1.2.18 (00:e0:4c:77:6d:ab)
bound to 10.1.2.100 -- renewal in 302400 seconds.
starting system logger
starting initial daemons: portmap ntpd.
savecore: no core dump
checking quotas: done.
building ps databases: kvm dev.
clearing /tmp
starting pre-securelevel daemons:.
setting kernel security level: kern.securelevel: 0 -> 1
creating runtime link editor directory cache.
preserving editor files.
starting network daemons: sshd sendmail inetd.
starting standard daemons: apmd cron.
Thu May 19 00:44:55 EDT 2011
