When looking at the snapshot tgz files on the second level mirror in Erlangen and compared the dates to those from ftp.openbsd.org I also noticed that the files base40.tgz and comp40.tgz have a slightly different size and md5sum.
So I downloaded the files from ftp.openbsd.org and updated the system and now PF works again. Is there maybe something broken with the mirroring? Dmesg date from mirror: OpenBSD 4.0-current (GENERIC) #1162: Wed Oct 18 18:25:41 MDT 2006 Dmesg date from master: OpenBSD 4.0-current (GENERIC) #1159: Tue Oct 17 18:24:33 MDT 2006 New master dmesg: OpenBSD 4.0-current (GENERIC) #1162: Wed Oct 18 18:25:41 MDT 2006 [EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/GENERIC cpu0: Intel(R) Pentium(R) 4 CPU 2.80GHz ("GenuineIntel" 686-class) 2.81 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,CNXT-ID,CX16 real mem = 1073053696 (1047904K) avail mem = 970838016 (948084K) using 4256 buffers containing 53776384 bytes (52516K) of memory mainbus0 (root) bios0 at mainbus0: AT/286+(00) BIOS, date 03/24/06, BIOS32 rev. 0 @ 0xffe90, SMBIOS rev. 2.3 @ 0xfa3d0 (48 entries) bios0: Dell Computer Corporation PowerEdge 850 pcibios0 at bios0: rev 2.1 @ 0xf0000/0x10000 pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xfb840/176 (9 entries) pcibios0: PCI Interrupt Router at 000:31:0 ("Intel 82801GB LPC" rev 0x00) pcibios0: PCI bus #7 is the last bus bios0: ROM list: 0xc0000/0xb000 0xcb000/0x3c00 0xcf000/0x600 0xec000/0x4000! ipmi0 at mainbus0: version 1.5 interface KCS iobase 0xca8/8 spacing 4 cpu0 at mainbus0 pci0 at mainbus0 bus 0: configuration mode 1 (no bios) pchb0 at pci0 dev 0 function 0 "Intel E7230 MCH" rev 0x00 ppb0 at pci0 dev 1 function 0 "Intel E7230 PCIE" rev 0x00 pci1 at ppb0 bus 1 ppb1 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x01 pci2 at ppb1 bus 2 ppb2 at pci2 dev 0 function 0 "Intel PCIE-PCIE" rev 0x09 pci3 at ppb2 bus 3 ppb3 at pci3 dev 2 function 0 vendor "Hint", unknown product 0x0022 rev 0x04 pci4 at ppb3 bus 4 vga1 at pci4 dev 2 function 0 "ATI Radeon VE QY" rev 0x00 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) vendor "Dell", unknown product 0x0010 (class undefined unknown subclass 0x00, rev 0x00) at pci4 dev 4 function 0 not configured "Dell DRAC 4 Virtual UART" rev 0x00 at pci4 dev 4 function 1 not configured "Dell DRAC 4 SMIC" rev 0x00 at pci4 dev 4 function 2 not configured pciide0 at pci4 dev 7 function 0 "CMD Technology PCI0680" rev 0x02 pciide0: bus-master DMA support present pciide0: channel 0 wired to native-PCI mode pciide0: using irq 10 for native-PCI interrupt atapiscsi0 at pciide0 channel 0 drive 0 scsibus0 at atapiscsi0: 2 targets sd0 at scsibus0 targ 0 lun 0: <DELL, VSF, 0123> SCSI0 0/direct removable sd0: drive offline atapiscsi1 at pciide0 channel 0 drive 1 scsibus1 at atapiscsi1: 2 targets cd0 at scsibus1 targ 0 lun 0: <DELL, VCD, 0133> SCSI0 5/cdrom removable sd0(pciide0:0:0): using PIO mode 3 cd0(pciide0:0:1): using PIO mode 3 pciide0: channel 1 wired to native-PCI mode ppb4 at pci0 dev 28 function 4 "Intel 82801G PCIE" rev 0x01 pci5 at ppb4 bus 5 bge0 at pci5 dev 0 function 0 "Broadcom BCM5721" rev 0x11, BCM5750 B1 (0x4101): irq 10, address 00:15:c5:60:88:06 brgphy0 at bge0 phy 1: BCM5750 10/100/1000baseT PHY, rev. 0 ppb5 at pci0 dev 28 function 5 "Intel 82801G PCIE" rev 0x01 pci6 at ppb5 bus 6 bge1 at pci6 dev 0 function 0 "Broadcom BCM5721" rev 0x11, BCM5750 B1 (0x4101): irq 5, address 00:15:c5:60:88:07 brgphy1 at bge1 phy 1: BCM5750 10/100/1000baseT PHY, rev. 0 uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: irq 11 usb0 at uhci0: USB revision 1.0 uhub0 at usb0 uhub0: Intel UHCI root hub, rev 1.00/1.00, addr 1 uhub0: 2 ports with 2 removable, self powered uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: irq 10 usb1 at uhci1: USB revision 1.0 uhub1 at usb1 uhub1: Intel UHCI root hub, rev 1.00/1.00, addr 1 uhub1: 2 ports with 2 removable, self powered uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x01: irq 6 usb2 at uhci2: USB revision 1.0 uhub2 at usb2 uhub2: Intel UHCI root hub, rev 1.00/1.00, addr 1 uhub2: 2 ports with 2 removable, self powered ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: irq 11 usb3 at ehci0: USB revision 2.0 uhub3 at usb3 uhub3: Intel EHCI root hub, rev 2.00/1.00, addr 1 uhub3: 6 ports with 6 removable, self powered ppb6 at pci0 dev 30 function 0 "Intel 82801BA AGP" rev 0xe1 pci7 at ppb6 bus 7 ichpcib0 at pci0 dev 31 function 0 "Intel 82801GB LPC" rev 0x01: PM disabled pciide1 at pci0 dev 31 function 1 "Intel 82801GB IDE" rev 0x01: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility atapiscsi2 at pciide1 channel 0 drive 0 scsibus2 at atapiscsi2: 2 targets cd1 at scsibus2 targ 0 lun 0: <TEAC, CD-ROM CD-224E-N, 3.AB> SCSI0 5/cdrom removable cd1(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 2 pciide1: channel 1 ignored (disabled) pciide2 at pci0 dev 31 function 2 "Intel 82801GB SATA" rev 0x01: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI pciide2: using irq 11 for native-PCI interrupt wd0 at pciide2 channel 0 drive 0: <ST3808110AS> wd0: 16-sector PIO, LBA48, 76293MB, 156250000 sectors wd0(pciide2:0:0): using PIO mode 4, Ultra-DMA mode 5 wd1 at pciide2 channel 1 drive 0: <ST380013AS> wd1: 16-sector PIO, LBA48, 76293MB, 156250000 sectors wd1(pciide2:1:0): using PIO mode 4, Ultra-DMA mode 5 ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: irq 11 iic0 at ichiic0: disabled to avoid ipmi0 interactions isa0 at ichpcib0 isadma0 at isa0 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 pmsi0 at pckbc0 (aux slot) pckbc0: using irq 12 for aux slot wsmouse0 at pmsi0 mux 0 pcppi0 at isa0 port 0x61 midi0 at pcppi0: <PC speaker> spkr0 at pcppi0 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo biomask efcd netmask efed ttymask ffef pctr: user-level cycle counter enabled uhidev0 at uhub0 port 1 configuration 1 interface 0 uhidev0: Dell DRAC4, rev 1.10/0.00, 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 1 configuration 1 interface 1 uhidev1: Dell DRAC4, rev 1.10/0.00, addr 2, iclass 3/1 ums0 at uhidev1: 3 buttons and Z dir. wsmouse1 at ums0 mux 0 dkcsum: wd0 matches BIOS drive 0x80 dkcsum: wd1 matches BIOS drive 0x81 root on wd0a rootdev=0x0 rrootdev=0x300 rawdev=0x302