Error building kernel in 9.0-BETA3: use of uninitialized variable in ipfw

From: Brett Glass <brett_at_lariat.net>
Date: Sat, 15 Oct 2011 12:38:31 -0600
Just tried to build a new kernel in 9.0-BETA3 with the IPFIREWALL 
option, and found that the build halts with a compiler error. The 
error occurs at netinet/ipfw/ip_fw_pfil.c, line 185, where the 
compiler complains that the variable "len" is used before 
intialization. Problem occurs on both i386 and amd64 platforms. 
Sample kernel config follows:

cpu             HAMMER
ident           BETA

#makeoptions    DEBUG=-g                # Build kernel with gdb(1) 
debug symbols

options         SCHED_ULE               # ULE scheduler
options         PREEMPTION              # Enable kernel thread preemption
options         INET                    # InterNETworking
#options        INET6                   # IPv6 communications protocols
#options        SCTP                    # Stream Control Transmission Protocol
options         FFS                     # Berkeley Fast Filesystem
options         SOFTUPDATES             # Enable FFS soft updates support
#options        UFS_ACL                 # Support for access control lists
options         UFS_DIRHASH             # Improve performance on 
big directories
#options        UFS_GJOURNAL            # Enable gjournal-based UFS journaling
#options        MD_ROOT                 # MD is a potential root device
#options        NFSCL                   # New Network Filesystem Client
#options        NFSD                    # New Network Filesystem Server
#options        NFSLOCKD                # Network Lock Manager
#options        NFS_ROOT                # NFS usable as /, requires NFSCL
#options        MSDOSFS                 # MSDOS Filesystem
#options        CD9660                  # ISO 9660 Filesystem
options         PROCFS                  # Process filesystem 
(requires PSEUDOFS)
options         PSEUDOFS                # Pseudo-filesystem framework
options         GEOM_PART_GPT           # GUID Partition Tables.
options         GEOM_LABEL              # Provides labelization
#options        COMPAT_FREEBSD32        # Compatible with i386 binaries
#options        COMPAT_FREEBSD4         # Compatible with FreeBSD4
#options        COMPAT_FREEBSD5         # Compatible with FreeBSD5
#options        COMPAT_FREEBSD6         # Compatible with FreeBSD6
#options        COMPAT_FREEBSD7         # Compatible with FreeBSD7
options         SCSI_DELAY=5000         # Delay (in ms) before probing SCSI
#options        KTRACE                  # ktrace(1) support
#options        STACK                   # stack(9) support
options         SYSVSHM                 # SYSV-style shared memory
options         SYSVMSG                 # SYSV-style message queues
options         SYSVSEM                 # SYSV-style semaphores
options         _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B 
real-time extensions
options         PRINTF_BUFR_SIZE=128    # Prevent printf output 
being interspersed.
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev
#options        HWPMC_HOOKS             # Necessary kernel hooks for hwpmc(4)
#options        AUDIT                   # Security event auditing
#options        MAC                     # TrustedBSD MAC Framework
##options       KDTRACE_FRAME           # Ensure frames are compiled in
##options       KDTRACE_HOOKS           # Kernel DTrace hooks
#options        INCLUDE_CONFIG_FILE     # Include this file in kernel

# Debugging for use in -current
#options        KDB                     # Enable kernel debugger support.
#options        DDB                     # Support DDB.
#options        GDB                     # Support remote GDB.
#options        DEADLKRES               # Enable the deadlock resolver
#options        INVARIANTS              # Enable calls of extra sanity checking
#options        INVARIANT_SUPPORT       # Extra sanity checks of 
internal structures, required by IN
VARIANTS
#options        WITNESS                 # Enable checks to detect 
deadlocks and cycles
#options        WITNESS_SKIPSPIN        # Don't run witness on 
spinlocks for speed
#options        MALLOC_DEBUG_MAXZONES=8 # Separate malloc(9) zones

# Make an SMP-capable kernel by default
options         SMP                     # Symmetric MultiProcessor Kernel

# CPU frequency control
device          cpufreq

# Bus support.
device          acpi
device          pci

# Floppy drives
#device         fdc

# ATA controllers
device          ahci            # AHCI-compatible SATA controllers
device          ata             # Legacy ATA/SATA controllers
options         ATA_CAM         # Handle legacy controllers with CAM
options         ATA_STATIC_ID   # Static device numbering
#device         mvs             # Marvell 88SX50XX/88SX60XX/88SX70XX/SoC SATA
#device         siis            # SiliconImage SiI3124/SiI3132/SiI3531 SATA

# SCSI Controllers
#device         ahc             # AHA2940 and onboard AIC7xxx devices
#options        AHC_REG_PRETTY_PRINT    # Print register bitfields in debug
                                         # output.  Adds ~128k to driver.
#device         ahd             # AHA39320/29320 and onboard AIC79xx devices
#options        AHD_REG_PRETTY_PRINT    # Print register bitfields in debug
                                         # output.  Adds ~215k to driver.
#device         amd             # AMD 53C974 (Tekram DC-390(T))
#device         hptiop          # Highpoint RocketRaid 3xxx series
#device         isp             # Qlogic family
##device                ispfw           # Firmware for QLogic HBAs- 
normally a module
#device         mpt             # LSI-Logic MPT-Fusion
#device         mps             # LSI-Logic MPT-Fusion 2
##device                ncr             # NCR/Symbios Logic
#device         sym             # NCR/Symbios Logic (newer chipsets 
+ those of `ncr')
#device         trm             # Tekram DC395U/UW/F DC315U adapters

#device         adv             # Advansys SCSI adapters
#device         adw             # Advansys wide SCSI adapters
#device         aic             # Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
#device         bt              # Buslogic/Mylex MultiMaster SCSI adapters

# ATA/SCSI peripherals
device          scbus           # SCSI bus (required for ATA/SCSI)
#device         ch              # SCSI media changers
device          da              # Direct Access (disks)
#device         sa              # Sequential Access (tape etc)
#device         cd              # CD
device          pass            # Passthrough device (direct ATA/SCSI access)
#device         ses             # SCSI Environmental Services (and SAF-TE)

# RAID controllers interfaced to the SCSI subsystem
#device         amr             # AMI MegaRAID
#device         arcmsr          # Areca SATA II RAID
##XXX it is not 64-bit clean, -scottl
##device                asr             # DPT SmartRAID V, VI and 
Adaptec SCSI RAID
#device         ciss            # Compaq Smart RAID 5*
#device         dpt             # DPT Smartcache III, IV - See 
NOTES for options
#device         hptmv           # Highpoint RocketRAID 182x
#device         hptrr           # Highpoint RocketRAID 17xx, 22xx, 23xx, 25xx
#device         iir             # Intel Integrated RAID
#device         ips             # IBM (Adaptec) ServeRAID
#device         mly             # Mylex AcceleRAID/eXtremeRAID
#device         twa             # 3ware 9000 series PATA/SATA RAID

# RAID controllers
#device         aac             # Adaptec FSA RAID
#device         aacp            # SCSI passthrough for aac (requires CAM)
#device         ida             # Compaq Smart RAID
#device         mfi             # LSI MegaRAID SAS
#device         mlx             # Mylex DAC960 family
##XXX pointer/int warnings
##device                pst             # Promise Supertrak SX6000
#device         twe             # 3ware ATA RAID

# atkbdc0 controls both the keyboard and the PS/2 mouse
#device         atkbdc          # AT keyboard controller
#device         atkbd           # AT keyboard
#device         psm             # PS/2 mouse

#device         kbdmux          # keyboard multiplexer

device          vga             # VGA video card driver

#device         splash          # Splash screen and screen saver support

# syscons is the default console driver, resembling an SCO console
device          sc
#options        SC_PIXEL_MODE   # add support for the raster text mode

device          agp             # support several AGP chipsets

# PCCARD (PCMCIA) support
# PCMCIA and cardbus bridge support
#device         cbb             # cardbus (yenta) bridge
#device         pccard          # PC Card (16-bit) bus
#device         cardbus         # CardBus (32-bit) bus

# Serial (COM) ports
#device         uart            # Generic UART driver

# Parallel port
#device         ppc
#device         ppbus           # Parallel port bus (required)
#device         lpt             # Printer
#device         plip            # TCP/IP over parallel
#device         ppi             # Parallel port interface device
##device                vpo             # Requires scbus and da

#device         puc             # Multi I/O cards and multi-channel UARTs

# PCI Ethernet NICs.
#device         bxe             # Broadcom 
BCM57710/BCM57711/BCM57711E 10Gb Ethernet
#device         de              # DEC/Intel DC21x4x (``Tulip'')
#device         em              # Intel PRO/1000 Gigabit Ethernet Family
#device         igb             # Intel PRO/1000 PCIE Server Gigabit Family
#device         ixgbe           # Intel PRO/10GbE PCIE Ethernet Family
#device         le              # AMD Am7900 LANCE and Am79C9xx PCnet
#device         ti              # Alteon Networks Tigon I/II gigabit Ethernet
#device         txp             # 3Com 3cR990 (``Typhoon'')
#device         vx              # 3Com 3c590, 3c595 (``Vortex'')

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device          miibus          # MII bus support
#device         ae              # Attansic/Atheros L2 FastEthernet
#device         age             # Attansic/Atheros L1 Gigabit Ethernet
#device         alc             # Atheros AR8131/AR8132 Ethernet
#device         ale             # Atheros AR8121/AR8113/AR8114 Ethernet
#device         bce             # Broadcom BCM5706/BCM5708 Gigabit Ethernet
#device         bfe             # Broadcom BCM440x 10/100 Ethernet
#device         bge             # Broadcom BCM570xx Gigabit Ethernet
#device         dc              # DEC/Intel 21143 and various workalikes
#device         et              # Agere ET1310 10/100/Gigabit Ethernet
#device         fxp             # Intel EtherExpress PRO/100B (82557, 82558)
#device         jme             # JMicron JMC250 Gigabit/JMC260 Fast Ethernet
#device         lge             # Level 1 LXT1001 gigabit Ethernet
#device         msk             # Marvell/SysKonnect Yukon II Gigabit Ethernet
#device         nfe             # nVidia nForce MCP on-board Ethernet
#device         nge             # NatSemi DP83820 gigabit Ethernet
##device                nve             # nVidia nForce MCP 
on-board Ethernet Networking
#device         pcn             # AMD Am79C97x PCI 10/100 
(precedence over 'le')
device          re              # RealTek 8139C+/8169/8169S/8110S
#device         rl              # RealTek 8129/8139
#device         sf              # Adaptec AIC-6915 (``Starfire'')
#device         sge             # Silicon Integrated Systems SiS190/191
#device         sis             # Silicon Integrated Systems SiS 900/SiS 7016
#device         sk              # SysKonnect SK-984x & SK-982x gigabit Ethernet
#device         ste             # Sundance ST201 (D-Link DFE-550TX)
#device         stge            # Sundance/Tamarack TC9021 gigabit Ethernet
#device         tl              # Texas Instruments ThunderLAN
#device         tx              # SMC EtherPower II (83c170 ``EPIC'')
#device         vge             # VIA VT612x gigabit Ethernet
#device         vr              # VIA Rhine, Rhine II
#device         wb              # Winbond W89C840F
#device         xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')

# ISA Ethernet NICs.  pccard NICs included.
#device         cs              # Crystal Semiconductor CS89x0 NIC
# 'device ed' requires 'device miibus'
#device         ed              # NE[12]000, SMC Ultra, 3c503, DS8390 cards
#device         ex              # Intel EtherExpress Pro/10 and Pro/10+
#device         ep              # Etherlink III based cards
#device         fe              # Fujitsu MB8696x based cards
#device         sn              # SMC's 9000 series of Ethernet chips
#device         xe              # Xircom pccard Ethernet

# Wireless NIC cards
#device         wlan            # 802.11 support
#options        IEEE80211_DEBUG # enable debug msgs
#options        IEEE80211_AMPDU_AGE # age frames in AMPDU reorder q's
#options        IEEE80211_SUPPORT_MESH  # enable 802.11s draft support
#device         wlan_wep        # 802.11 WEP support
#device         wlan_ccmp       # 802.11 CCMP support
#device         wlan_tkip       # 802.11 TKIP support
#device         wlan_amrr       # AMRR transmit rate control algorithm
#device         an              # Aironet 4500/4800 802.11 wireless NICs.
#device         ath             # Atheros NIC's
#device         ath_pci         # Atheros pci/cardbus glue
#device         ath_hal         # pci/cardbus chip support
#options        AH_SUPPORT_AR5416       # enable AR5416 tx/rx descriptors
#device         ath_rate_sample # SampleRate tx rate control for ath
##device                bwi             # Broadcom BCM430x/BCM431x 
wireless NICs.
##device                bwn             # Broadcom BCM43xx wireless NICs.
#device         ipw             # Intel 2100 wireless NICs.
#device         iwi             # Intel 2200BG/2225BG/2915ABG wireless NICs.
#device         iwn             # Intel 4965/1000/5000/6000 wireless NICs.
#device         malo            # Marvell Libertas wireless NICs.
#device         mwl             # Marvell 88W8363 802.11n wireless NICs.
#device         ral             # Ralink Technology RT2500 wireless NICs.
#device         wi              # WaveLAN/Intersil/Symbol 802.11 wireless NICs.
#device         wpi             # Intel 3945ABG wireless NICs.

# Pseudo devices.
device          loop            # Network loopback
device          random          # Entropy device
device          ether           # Ethernet support
device          vlan            # 802.1Q VLAN support
device          tun             # Packet tunnel.
device          pty             # BSD-style compatibility pseudo ttys
#device         md              # Memory "disks"
#device         gif             # IPv6 and IPv4 tunneling
#device         faith           # IPv6-to-IPv4 relaying (translation)
#device         firmware        # firmware assist module

# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
# Note that 'bpf' is required for DHCP.
device          bpf             # Berkeley packet filter

# USB support
#options        USB_DEBUG       # enable debug msgs
device          uhci            # UHCI PCI->USB interface
#device         ohci            # OHCI PCI->USB interface
#device         ehci            # EHCI PCI->USB interface (USB 2.0)
#device         xhci            # XHCI PCI->USB interface (USB 3.0)
device          usb             # USB Bus (required)
##device                udbp            # USB Double Bulk Pipe 
devices (needs netgraph)
#device         uhid            # "Human Interface Devices"
device          ukbd            # Keyboard
#device         ulpt            # Printer
#device         umass           # Disks/Mass storage - Requires scbus and da
#device         ums             # Mouse
#device         urio            # Diamond Rio 500 MP3 player
# USB Serial devices
#device         u3g             # USB-based 3G modems (Option, Huawei, Sierra)
#device         uark            # Technologies ARK3116 based serial adapters
#device         ubsa            # Belkin F5U103 and compatible serial adapters
#device         uftdi           # For FTDI usb serial adapters
#device         uipaq           # Some WinCE based devices
#device         uplcom          # Prolific PL-2303 serial adapters
#device         uslcom          # SI Labs CP2101/CP2102 serial adapters
#device         uvisor          # Visor and Palm devices
#device         uvscom          # USB serial support for DDI pocket's PHS
# USB Ethernet, requires miibus
#device         aue             # ADMtek USB Ethernet
#device         axe             # ASIX Electronics USB Ethernet
#device         cdce            # Generic USB over Ethernet
#device         cue             # CATC USB Ethernet
#device         kue             # Kawasaki LSI USB Ethernet
#device         rue             # RealTek RTL8150 USB Ethernet
#device         udav            # Davicom DM9601E USB
# USB Wireless
#device         rum             # Ralink Technology RT2501USB wireless NICs
#device         run             # Ralink Technology RT2700/RT2800/RT3000 NICs.
#device         uath            # Atheros AR5523 wireless NICs
#device         upgt            # Conexant/Intersil PrismGT wireless NICs.
#device         ural            # Ralink Technology RT2500USB wireless NICs
#device         urtw            # Realtek RTL8187B/L wireless NICs
#device         zyd             # ZyDAS zd1211/zd1211b wireless NICs

# FireWire support
#device         firewire        # FireWire bus code
#device         sbp             # SCSI over FireWire (Requires scbus and da)
#device         fwe             # Ethernet over FireWire (non-standard!)
#device         fwip            # IP over FireWire (RFC 2734,3146)
#device         dcons           # Dumb console driver
#device         dcons_crom      # Configuration ROM for dcons

# Sound support
#device         sound           # Generic sound driver (required)
#device         snd_es137x      # Ensoniq AudioPCI ES137x
#device         snd_hda         # Intel High Definition Audio
#device         snd_ich         # Intel, NVidia and other ICH AC'97 Audio
#device         snd_uaudio      # USB Audio
#device         snd_via8233     # VIA VT8233x Audio

options         IPFIREWALL              # IPFW firewall
options         IPFIREWALL_DEFAULT_TO_ACCEPT    # For safety
options         IPFIREWALL_FORWARD      # For walled gardens, transparent
                                         # proxies and policy routing
options         IPFIREWALL_NAT          # Firewall kernel NAT
options         IPFIREWALL_VERBOSE      #enable logging to syslogd(8)
options         IPFIREWALL_VERBOSE_LIMIT=100    #limit verbosity
options         LIBALIAS                # Necessary for kernel NAT
options         DUMMYNET                # For pacing in IPFW
options         HZ=1000                 # For DUMMYNET
options         NETGRAPH                # For mpd
options         NETGRAPH_MPPC_ENCRYPTION
options         NETGRAPH_SOCKET
options         NETGRAPH_TEE
options         NETGRAPH_PPTPGRE
options         NETGRAPH_KSOCKET
options         NETGRAPH_IFACE
options         NETGRAPH_PPP
options         NETGRAPH_TCPMSS
options         NETGRAPH_VJC
Received on Sat Oct 15 2011 - 16:38:38 UTC

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