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Subjectoops with 2.0.27
I have a masquerading host that I just upgrded to 16M (from 4).  I had the
'allow large windows' switch turned on and got several oops. The only one that
got captured by syslog follows. This happened while it was connected via ppp
to my isp and I was working through it from my main machine which also has
the switch turned on. Turning off that switch (and re-compile), seems to have
fixed the problem. I don't know if the first 4 lines are related but I left
them in just in case.

pern kernel: MASQ: failed TCP/UDP checksum from 204.157.220.13!
pern last message repeated 5 times
pern kernel: MASQ: failed TCP/UDP checksum from 204.157.220.13!
pern last message repeated 8 times
pern kernel: Unable to handle kernel NULL pointer dereference at virtual address c000002c
pern kernel: current->tss.cr3 = 00ab2000, 8r3 = 00ab2000
pern kernel: *pde = 00102067
pern kernel: *pte = 00000027
pern kernel: Oops: 0000
pern kernel: CPU: 0
pern kernel: EIP: 0010:[wd_block_output+98/168]
pern kernel: EFLAGS: 00010202
pern kernel: eax: 0000002c ebx: 001a94a8 ecx: 00000000 edx: 000000b2
pern kernel: esi: 004b88ba edi: 000d06b0 ebp: 000000b2 esp: 00bb69f4
pern kernel: ds: 0018 es: 0018 fs: 0018 gs: 002b ss: 0018
pern kernel: Process rpm (pid: 3256, process nr: 24, stackpage=00bb6000)
pern kernel: Stack: 00096118 00000006 000000b2 001a94a8 00000280 004b0285 000d0600 0017bca9
pern kernel: 001a94a8 000000b2 004b880a 00000006 00000000 004b88d8 001a9540 001a94a8
pern kernel: 00140000 004b78e5 000000b2 00000290 00136b7d 004b88d8 001a94a8 004b88d8
pern kernel: Call Trace: [ei_start_xmit+597/740] [tcp_err+184/412] [do_dev_queue_xmit+381/432] [dev_queue_xmit+23/36] [ip_build_xmit+1369/2812] [<0181c950>] [<0181c96c>]
pern kernel: [udp_send+201/236] [udp_getfrag+0/168] [udp_sendto+189/224] [udp_sendmsg+46/180] [inet_sendmsg+129/144] [<0181cc2b>] [do_fast_IRQ+41/72] [fast_IRQ4_interrupt+59/96]
pern kernel: [<0181c2c8>] [<0181c113>] [<0181c105>] [<0181c04c>] [do_fast_IRQ+41/72] [fast_IRQ4_interrupt+59/96] [<0181c113>] [<0181bea4>]
pern kernel: [<0181a844>] [<0181dc24>] [do_page_fault+0/712] [generic_file_read+1265/1476] [<0181d6a5>] [do_no_page+0/776] [verify_area+279/440] [sys_read+136/176]
pern kernel: [system_call+85/128]
pern kernel: Code: c2 01 74 01 a4 8b 43 44 8a 40 23 66 8b 54 24 14 ee 5b 5e 5f
pern kernel: Aiee, killing interrupt handler
pern kernel: eth0: No Tx buffers free! irq=0 tx1=-1 tx2=178 last=-1

The following is the config as it is now - the same except for the 'no' on
allow large windows.

#
# Automatically generated by make menuconfig: don't edit
#

#
# Code maturity level options
#
CONFIG_EXPERIMENTAL=y

#
# Loadable module support
#
CONFIG_MODULES=y
CONFIG_MODVERSIONS=y
CONFIG_KERNELD=y

#
# General setup
#
CONFIG_MATH_EMULATION=y
CONFIG_NET=y
# CONFIG_MAX_16M is not set
# CONFIG_PCI is not set
CONFIG_SYSVIPC=y
CONFIG_BINFMT_AOUT=y
CONFIG_BINFMT_ELF=y
# CONFIG_BINFMT_JAVA is not set
CONFIG_KERNEL_ELF=y
CONFIG_M386=y

#
# Floppy, IDE, and other block devices
#
CONFIG_BLK_DEV_FD=y
CONFIG_BLK_DEV_IDE=y
# CONFIG_BLK_DEV_HD_IDE is not set
# CONFIG_BLK_DEV_IDECD is not set
# CONFIG_BLK_DEV_IDETAPE is not set
# CONFIG_BLK_DEV_IDE_PCMCIA is not set
# CONFIG_BLK_DEV_CMD640 is not set
# CONFIG_IDE_CHIPSETS is not set
# CONFIG_BLK_DEV_LOOP is not set
# CONFIG_BLK_DEV_MD is not set
# CONFIG_BLK_DEV_RAM is not set
# CONFIG_BLK_DEV_XD is not set
# CONFIG_BLK_DEV_HD is not set

#
# Networking options
#
CONFIG_FIREWALL=y
# CONFIG_NET_ALIAS is not set
CONFIG_INET=y
CONFIG_IP_FORWARD=y
# CONFIG_IP_MULTICAST is not set
CONFIG_IP_FIREWALL=y
CONFIG_IP_FIREWALL_VERBOSE=y
CONFIG_IP_MASQUERADE=y
# CONFIG_IP_TRANSPARENT_PROXY is not set
CONFIG_IP_ALWAYS_DEFRAG=y
CONFIG_IP_ACCT=y
# CONFIG_IP_ROUTER is not set
# CONFIG_NET_IPIP is not set
# CONFIG_INET_PCTCP is not set
# CONFIG_INET_RARP is not set
# CONFIG_NO_PATH_MTU_DISCOVERY is not set
CONFIG_IP_NOSR=y
# CONFIG_SKB_LARGE is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_AX25 is not set
# CONFIG_BRIDGE is not set
# CONFIG_NETLINK is not set

#
# SCSI support
#
# CONFIG_SCSI is not set

#
# Network device support
#
CONFIG_NETDEVICES=y
CONFIG_DUMMY=m
# CONFIG_EQUALIZER is not set
# CONFIG_DLCI is not set
CONFIG_PLIP=m
CONFIG_PPP=y
CONFIG_SLIP=m
CONFIG_SLIP_COMPRESSED=y
# CONFIG_SLIP_SMART is not set
# CONFIG_SLIP_MODE_SLIP6 is not set
# CONFIG_NET_RADIO is not set
CONFIG_NET_ETHERNET=y
# CONFIG_NET_VENDOR_3COM is not set
# CONFIG_LANCE is not set
CONFIG_NET_VENDOR_SMC=y
CONFIG_WD80x3=y
# CONFIG_ULTRA is not set
# CONFIG_SMC9194 is not set
# CONFIG_NET_ISA is not set
# CONFIG_NET_EISA is not set
# CONFIG_NET_POCKET is not set
# CONFIG_TR is not set
# CONFIG_FDDI is not set
# CONFIG_ARCNET is not set

#
# ISDN subsystem
#
# CONFIG_ISDN is not set

#
# CD-ROM drivers (not for SCSI or IDE/ATAPI drives)
#
# CONFIG_CD_NO_IDESCSI is not set

#
# Filesystems
#
# CONFIG_QUOTA is not set
# CONFIG_LOCK_MANDATORY is not set
CONFIG_MINIX_FS=m
# CONFIG_EXT_FS is not set
CONFIG_EXT2_FS=y
# CONFIG_XIA_FS is not set
CONFIG_FAT_FS=m
CONFIG_MSDOS_FS=m
CONFIG_VFAT_FS=m
CONFIG_UMSDOS_FS=m
CONFIG_PROC_FS=y
CONFIG_NFS_FS=m
CONFIG_SMB_FS=m
CONFIG_SMB_WIN95=y
# CONFIG_ISO9660_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_SYSV_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_UFS_FS is not set

#
# Character devices
#
CONFIG_SERIAL=y
# CONFIG_DIGI is not set
# CONFIG_CYCLADES is not set
# CONFIG_STALDRV is not set
# CONFIG_RISCOM8 is not set
CONFIG_PRINTER=m
# CONFIG_MOUSE is not set
# CONFIG_UMISC is not set
# CONFIG_QIC02_TAPE is not set
# CONFIG_FTAPE is not set
# CONFIG_APM is not set
# CONFIG_WATCHDOG is not set
# CONFIG_RTC is not set

#
# Sound
#
# CONFIG_SOUND is not set

#
# Kernel hacking
#
# CONFIG_PROFILE is not set



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