My system paniced a couple of times in a couple of days with the
following error: "ffs_alloccg: map corrupted"!

Furthermore, I have noticed some strange things occur simetimes: a
particular byte of a give file changes!

The system is an OpenBSD 3.4 i386 (a checkout of OPENBSD_3_4 of a couple
of days ago).

What does it means?


Thanks.



P.S.
Here it is the dmesg:

Oct 7 10:15:54 galadriel /bsd:
giannici@galadriel.neomedia.it:/usr/src/sys/arch/i386/compile/NEOMEDIA
Oct 7 10:15:54 galadriel /bsd: cpu0: Intel Pentium 4 ("GenuineIntel"
686-class) 2.81 GHz
Oct 7 10:15:54 galadriel /bsd: cpu0:
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,P GE,MCA,CMOV,PAT,PSE36,CFLUSH,ACPI,MMX,FXSR,SIMD,SI MD2,SS,HTT,TM,SBF,CNXT-ID
Oct 7 10:15:54 galadriel /bsd: real mem = 1072476160 (1047340K)
Oct 7 10:15:54 galadriel /bsd: avail mem = 988934144 (965756K)
Oct 7 10:15:54 galadriel /bsd: using 4278 buffers containing 53727232
bytes (52468K) of memory
Oct 7 10:15:54 galadriel /bsd: mainbus0 (root)
Oct 7 10:15:54 galadriel /bsd: bios0 at mainbus0: AT/286+(00) BIOS,
date 06/11/03, BIOS32 rev. 0 @ 0xf0010
Oct 7 10:15:54 galadriel /bsd: pcibios0 at bios0: rev. 2.1 @
0xf0000/0x10000
Oct 7 10:15:54 galadriel /bsd: pcibios0: PCI IRQ Routing Table rev. 1.0
@ 0xf53c0/256 (14 entries)
Oct 7 10:15:54 galadriel /bsd: pcibios0: PCI Interrupt Router at
000:31:0 ("Intel 82801EB/ER LPC" rev 0x00)
Oct 7 10:15:54 galadriel /bsd: pcibios0: PCI bus #2 is the last bus
Oct 7 10:15:54 galadriel /bsd: bios0: ROM list: 0xc0000/0x8000
0xc8000/0x1800 0xc9800/0x4c00
Oct 7 10:15:54 galadriel /bsd: pci0 at mainbus0 bus 0: configuration
mode 1 (no bios)
Oct 7 10:15:54 galadriel /bsd: pchb0 at pci0 dev 0 function 0 "Intel
82865G/PE/P CPU to I/0 Bridge 1" rev 0x02
Oct 7 10:15:54 galadriel /bsd: ppb0 at pci0 dev 1 function 0 "Intel
82865G/PE/P CPU to AGP Bridge" rev 0x02
Oct 7 10:15:54 galadriel /bsd: pci1 at ppb0 bus 1
Oct 7 10:15:54 galadriel /bsd: vga1 at pci1 dev 0 function 0 "ATI Rage
Fury" rev 0x00
Oct 7 10:15:54 galadriel /bsd: wsdisplay0 at vga1: console (80x25,
vt100 emulation)
Oct 7 10:15:54 galadriel /bsd: wsdisplay0: screen 1-5 added (80x25,
vt100 emulation)
Oct 7 10:15:54 galadriel /bsd: uhci0 at pci0 dev 29 function 0 "Intel
82801EB/ER USB" rev 0x02: irq 10
Oct 7 10:15:54 galadriel /bsd: usb0 at uhci0: USB revision 1.0
Oct 7 10:15:54 galadriel /bsd: uhub0 at usb0
Oct 7 10:15:54 galadriel /bsd: uhub0: Intel UHCI root hub, class 9/0,
rev 1.00/1.00, addr 1
Oct 7 10:15:54 galadriel /bsd: uhub0: 2 ports with 2 removable, self
powered
Oct 7 10:15:54 galadriel /bsd: uhci1 at pci0 dev 29 function 1 "Intel
82801EB/ER USB" rev 0x02: irq 5
Oct 7 10:15:54 galadriel /bsd: usb1 at uhci1: USB revision 1.0
Oct 7 10:15:54 galadriel /bsd: uhub1 at usb1
Oct 7 10:15:54 galadriel /bsd: uhub1: Intel UHCI root hub, class 9/0,
rev 1.00/1.00, addr 1
Oct 7 10:15:54 galadriel /bsd: uhub1: 2 ports with 2 removable, self
powered
Oct 7 10:15:54 galadriel /bsd: uhci2 at pci0 dev 29 function 2 "Intel
82801EB/ER USB" rev 0x02: irq 5
Oct 7 10:15:54 galadriel /bsd: usb2 at uhci2: USB revision 1.0
Oct 7 10:15:54 galadriel /bsd: uhub2 at usb2
Oct 7 10:15:54 galadriel /bsd: uhub2: Intel UHCI root hub, class 9/0,
rev 1.00/1.00, addr 1
Oct 7 10:15:54 galadriel /bsd: uhub2: 2 ports with 2 removable, self
powered
Oct 7 10:15:54 galadriel /bsd: uhci3 at pci0 dev 29 function 3 "Intel
82801EB/ER USB" rev 0x02: irq 10
Oct 7 10:15:54 galadriel /bsd: usb3 at uhci3: USB revision 1.0
Oct 7 10:15:54 galadriel /bsd: uhub3 at usb3
Oct 7 10:15:54 galadriel /bsd: uhub3: Intel UHCI root hub, class 9/0,
rev 1.00/1.00, addr 1
Oct 7 10:15:54 galadriel /bsd: uhub3: 2 ports with 2 removable, self
powered
Oct 7 10:15:54 galadriel /bsd: "Intel 82801EB/ER USB" rev 0x02 at pci0
dev 29 function 7 not configured
Oct 7 10:15:54 galadriel /bsd: ppb1 at pci0 dev 30 function 0 "Intel
82801BA AGP" rev 0xc2
Oct 7 10:15:54 galadriel /bsd: pci2 at ppb1 bus 2
Oct 7 10:15:54 galadriel /bsd: skc0 at pci2 dev 5 function 0 "3Com
3c940" rev 0x12: irq 11
Oct 7 10:15:54 galadriel /bsd: skc0: 3Com Gigabit LOM (3C940)
Oct 7 10:15:54 galadriel /bsd: sk0 at skc0 port A: address
00:0c:6e:4d:8d:c3
Oct 7 10:15:54 galadriel /bsd: eephy0 at sk0 phy 0: Marvell 88E1000*
Gigabit PHY
Oct 7 10:15:54 galadriel /bsd: fxp0 at pci2 dev 9 function 0 "Intel
82557" rev 0x0c: irq 5, address 00:02:b3:94:a1:37
Oct 7 10:15:54 galadriel /bsd: inphy0 at fxp0 phy 1: i82555 10/100
media interface, rev. 4
Oct 7 10:15:54 galadriel /bsd: gdt0 at pci2 dev 10 function 0 "Vortex
GDT6513RS" rev 0x00: irq 11 dpmem f7efc000 1-bus 1 cache device
Oct 7 10:15:54 galadriel /bsd: gdt0: ver 21c, cache on, strategy 2,
writeback on, blksz 32
Oct 7 10:15:54 galadriel /bsd: gdt0: raw feat 1 cache feat 101
Oct 7 10:15:54 galadriel /bsd: scsibus0 at gdt0: 35 targets
Oct 7 10:15:54 galadriel /bsd: sd0 at scsibus0 targ 0 lun 0: <ICP, Host
drive #00, > SCSI2 0/direct fixed
Oct 7 10:15:54 galadriel /bsd: sd0: 70001MB, 8924 cyl, 255 head, 63
sec, 512 bytes/sec, 143364060 sec total
Oct 7 10:15:54 galadriel /bsd: scsibus1 at gdt0: 16 targets
Oct 7 10:15:54 galadriel /bsd: pcib0 at pci0 dev 31 function 0 "Intel
82801EB/ER LPC" rev 0x02
Oct 7 10:15:54 galadriel /bsd: pciide0 at pci0 dev 31 function 1 "Intel
82801EB/ER IDE" rev 0x02: DMA, channel 0 configured to compatibility,
channel 1 configured to compatibility
Oct 7 10:15:54 galadriel /bsd: pciide0: channel 0 disabled (no drives)
Oct 7 10:15:54 galadriel /bsd: pciide0: channel 1 disabled (no drives)
Oct 7 10:15:54 galadriel /bsd: "Intel 82801EB/ER SMB" rev 0x02 at pci0
dev 31 function 3 not configured
Oct 7 10:15:54 galadriel /bsd: auich0 at pci0 dev 31 function 5 "Intel
82801EB/ER AC97 Audio" rev 0x02: irq 11, ICH5 AC97
Oct 7 10:15:54 galadriel /bsd: ac97: codec id 0x41445375 (Analog
Devices AD1985)
Oct 7 10:15:54 galadriel /bsd: ac97: codec features headphone, 20 bit
DAC, No 3D Stereo
Oct 7 10:15:54 galadriel /bsd: audio0 at auich0
Oct 7 10:15:54 galadriel /bsd: isa0 at pcib0
Oct 7 10:15:54 galadriel /bsd: isadma0 at isa0
Oct 7 10:15:54 galadriel /bsd: pckbc0 at isa0 port 0x60/5
Oct 7 10:15:54 galadriel /bsd: pckbd0 at pckbc0 (kbd slot)
Oct 7 10:15:54 galadriel /bsd: pckbc0: using irq 1 for kbd slot
Oct 7 10:15:54 galadriel /bsd: wskbd0 at pckbd0: console keyboard,
using wsdisplay0
Oct 7 10:15:54 galadriel /bsd: pcppi0 at isa0 port 0x61
Oct 7 10:15:54 galadriel /bsd: midi0 at pcppi0: <PC speaker>
Oct 7 10:15:54 galadriel /bsd: sysbeep0 at pcppi0
Oct 7 10:15:54 galadriel /bsd: lpt0 at isa0 port 0x378/4 irq 7
Oct 7 10:15:54 galadriel /bsd: lm0 at isa0 port 0x290/8: W83627THF
Oct 7 10:15:54 galadriel /bsd: npx0 at isa0 port 0xf0/16: using
exception 16
Oct 7 10:15:54 galadriel /bsd: pccom0 at isa0 port 0x3f8/8 irq 4:
ns16550a, 16 byte fifo
Oct 7 10:15:54 galadriel /bsd: pccom1 at isa0 port 0x2f8/8 irq 3:
ns16550a, 16 byte fifo
Oct 7 10:15:54 galadriel /bsd: fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
Oct 7 10:15:54 galadriel /bsd: fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2
head, 18 sec
Oct 7 10:15:54 galadriel /bsd: biomask c60 netmask c60 ttymask ce2
Oct 7 10:15:54 galadriel /bsd: pctr: user-level cycle counter enabled
Oct 7 10:15:54 galadriel /bsd: dkcsum: sd0 matched BIOS disk 80
Oct 7 10:15:54 galadriel /bsd: root on sd0a
Oct 7 10:15:54 galadriel /bsd: rootdev=0x400 rrootdev=0xd00 rawdev=0xd02
Oct 7 10:15:54 galadriel savecore: reboot after panic: ffs_alloccg: map
corrupted
Oct 7 10:15:54 galadriel savecore: no dump, not enough free space on device


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