linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops

Thanks for the feedback.

The oops is forced by the kernel after it sees then wrong negative d_count.

I'd say it's memory corruption, but it doesn't look like a memory bitflip.

I'm almost certain that it's not caused by the VM-global patch.

Which device driver and compiler are you using?

Andrea
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Andrea Arcangeli writes ("Re: linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops"):

chiark:~> gcc -v
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.2/specs gcc version 2.95.2 20000220 (Debian GNU/Linux) chiark:~> dpkg -l gcc Desired=Unknown/Install/Remove/Purge/Hold

| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err:uppercase=bad)
||/ Name           Version        Description

+++-==============-==============-============================================
ii gcc 2.95.2-13 The GNU C compiler.
chiark:~>

I've enclosed a copy of `.config' from the 2.2.18pre17+VM-global.

I forgot to mention, and it might be relevant (given that the oops is in hung_up_tty_read'), that I'm using a VPN system of my own devising which gets packets in and out of the kernel by using slattach' on pty's; it has no nonstandard kernel component, but probably has some unusual pty handling behaviour. If you really want to look at what it does, the source is on ftp.chiark.greenend.org.uk in ipif/service.c inside /users/ian/userv/userv-utils-0.2.0.tar.gz.

Ian.

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

#
# Code maturity level options
#
# CONFIG_EXPERIMENTAL is not set

#
# Processor type and features
#
# CONFIG_M386 is not set
# CONFIG_M486 is not set
# CONFIG_M586 is not set
CONFIG_M586TSC=y
# CONFIG_M686 is not set
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_TSC=y
# CONFIG_MICROCODE is not set
# CONFIG_X86_MSR is not set
# CONFIG_X86_CPUID is not set
CONFIG_1GB=y
# CONFIG_2GB is not set
# CONFIG_MATH_EMULATION is not set
# CONFIG_MTRR is not set
# CONFIG_SMP is not set

#
# Loadable module support
#
# CONFIG_MODULES is not set

#
# General setup
#
CONFIG_NET=y
CONFIG_PCI=y
# CONFIG_PCI_GOBIOS is not set
# CONFIG_PCI_GODIRECT is not set
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_QUIRKS=y
CONFIG_PCI_OLD_PROC=y
# CONFIG_MCA is not set
# CONFIG_VISWS is not set
CONFIG_SYSVIPC=y
CONFIG_BSD_PROCESS_ACCT=y
CONFIG_SYSCTL=y
CONFIG_BINFMT_AOUT=y
CONFIG_BINFMT_ELF=y
# CONFIG_BINFMT_MISC is not set
# CONFIG_PARPORT is not set
# CONFIG_APM is not set
# CONFIG_TOSHIBA is not set

#
# Plug and Play support
#
# CONFIG_PNP is not set

#
# Block devices
#
CONFIG_BLK_DEV_FD=y
# CONFIG_BLK_DEV_IDE is not set
# CONFIG_BLK_DEV_HD_ONLY is not set
# CONFIG_BLK_DEV_LOOP is not set
# CONFIG_BLK_DEV_NBD is not set
CONFIG_BLK_DEV_MD=y
# CONFIG_MD_LINEAR is not set
CONFIG_MD_STRIPED=y
# CONFIG_MD_MIRRORING is not set
# CONFIG_MD_RAID5 is not set
# CONFIG_MD_BOOT is not set
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=4096
# CONFIG_BLK_DEV_INITRD is not set
# CONFIG_BLK_DEV_XD is not set
# CONFIG_BLK_DEV_DAC960 is not set
CONFIG_PARIDE_PARPORT=y
# CONFIG_PARIDE is not set
# CONFIG_BLK_CPQ_DA is not set
# CONFIG_BLK_CPQ_CISS_DA is not set
# CONFIG_BLK_DEV_HD is not set

#
# Networking options
#
CONFIG_PACKET=y
CONFIG_NETLINK=y
CONFIG_RTNETLINK=y
CONFIG_NETLINK_DEV=y
CONFIG_FIREWALL=y
CONFIG_FILTER=y
CONFIG_UNIX=y
CONFIG_INET=y
# CONFIG_IP_MULTICAST is not set
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_RTNETLINK=y
CONFIG_NETLINK=y
# CONFIG_IP_MULTIPLE_TABLES is not set
# CONFIG_IP_ROUTE_MULTIPATH is not set
# CONFIG_IP_ROUTE_TOS is not set
CONFIG_IP_ROUTE_VERBOSE=y
# CONFIG_IP_ROUTE_LARGE_TABLES is not set
# CONFIG_IP_PNP is not set
CONFIG_IP_FIREWALL=y
CONFIG_IP_FIREWALL_NETLINK=y
CONFIG_NETLINK_DEV=y
# CONFIG_IP_TRANSPARENT_PROXY is not set
# CONFIG_IP_MASQUERADE is not set
# CONFIG_IP_ROUTER is not set
# CONFIG_NET_IPIP is not set
# CONFIG_NET_IPGRE is not set
CONFIG_IP_ALIAS=y
CONFIG_SYN_COOKIES=y
# CONFIG_INET_RARP is not set
CONFIG_SKB_LARGE=y
# CONFIG_IPX is not set
# CONFIG_ATALK is not set

#
# Telephony Support
#
# CONFIG_PHONE is not set
# CONFIG_PHONE_IXJ is not set

#
# SCSI support
#
CONFIG_SCSI=y
CONFIG_BLK_DEV_SD=y
CONFIG_CHR_DEV_ST=y
# CONFIG_BLK_DEV_SR is not set
# CONFIG_CHR_DEV_SG is not set
# CONFIG_SCSI_MULTI_LUN is not set
CONFIG_SCSI_CONSTANTS=y
CONFIG_SCSI_LOGGING=y

#
# SCSI low-level drivers
#
# CONFIG_SCSI_7000FASST is not set
# CONFIG_SCSI_ACARD is not set
# CONFIG_SCSI_AHA152X is not set
# CONFIG_SCSI_AHA1542 is not set
# CONFIG_SCSI_AHA1740 is not set
# CONFIG_SCSI_AIC7XXX is not set
# CONFIG_SCSI_IPS is not set
# CONFIG_SCSI_ADVANSYS is not set
# CONFIG_SCSI_IN2000 is not set
# CONFIG_SCSI_AM53C974 is not set
# CONFIG_SCSI_MEGARAID is not set
# CONFIG_SCSI_BUSLOGIC is not set
# CONFIG_SCSI_CPQFCTS is not set
# CONFIG_SCSI_DTC3280 is not set
# CONFIG_SCSI_EATA is not set
# CONFIG_SCSI_EATA_DMA is not set
# CONFIG_SCSI_EATA_PIO is not set
# CONFIG_SCSI_FUTURE_DOMAIN is not set
# CONFIG_SCSI_GDTH is not set
# CONFIG_SCSI_GENERIC_NCR5380 is not set
# CONFIG_SCSI_INITIO is not set
# CONFIG_SCSI_INIA100 is not set
# CONFIG_SCSI_NCR53C406A is not set
# CONFIG_SCSI_SYM53C416 is not set
# CONFIG_SCSI_SIM710 is not set
# CONFIG_SCSI_NCR53C7xx is not set
CONFIG_SCSI_NCR53C8XX=y
CONFIG_SCSI_SYM53C8XX=y
CONFIG_SCSI_NCR53C8XX_DEFAULT_TAGS=8
CONFIG_SCSI_NCR53C8XX_MAX_TAGS=32
CONFIG_SCSI_NCR53C8XX_SYNC=40
# CONFIG_SCSI_NCR53C8XX_IOMAPPED is not set
# CONFIG_SCSI_NCR53C8XX_PQS_PDS is not set
# CONFIG_SCSI_PAS16 is not set
# CONFIG_SCSI_PCI2000 is not set
# CONFIG_SCSI_PCI2220I is not set
# CONFIG_SCSI_PSI240I is not set
# CONFIG_SCSI_QLOGIC_FAS is not set
# CONFIG_SCSI_QLOGIC_ISP is not set
# CONFIG_SCSI_QLOGIC_FC is not set
# CONFIG_SCSI_SEAGATE is not set
# CONFIG_SCSI_DC390T is not set
# CONFIG_SCSI_T128 is not set
# CONFIG_SCSI_U14_34F is not set
# CONFIG_SCSI_ULTRASTOR is not set

#
# I2O device support
#
# CONFIG_I2O is not set
# CONFIG_I2O_PCI is not set
# CONFIG_I2O_BLOCK is not set
# CONFIG_I2O_SCSI is not set

#
# Network device support
#
CONFIG_NETDEVICES=y

#
# ARCnet devices
#
# CONFIG_ARCNET is not set
# CONFIG_DUMMY is not set
# CONFIG_BONDING is not set
# CONFIG_EQUALIZER is not set
# CONFIG_NET_SB1000 is not set

#
# Ethernet (10 or 100Mbit)
#
CONFIG_NET_ETHERNET=y
# CONFIG_NET_VENDOR_3COM is not set
# CONFIG_LANCE is not set
# CONFIG_NET_VENDOR_SMC is not set
# CONFIG_NET_VENDOR_RACAL is not set
CONFIG_NET_ISA=y
# CONFIG_AT1700 is not set
# CONFIG_E2100 is not set
# CONFIG_DEPCA is not set
# CONFIG_EWRK3 is not set
# CONFIG_EEXPRESS is not set
# CONFIG_EEXPRESS_PRO is not set
# CONFIG_FMV18X is not set
# CONFIG_HPLAN_PLUS is not set
# CONFIG_HPLAN is not set
# CONFIG_HP100 is not set
CONFIG_NE2000=y
# CONFIG_SK_G16 is not set
# CONFIG_NET_EISA is not set
# CONFIG_NET_POCKET is not set

#
# Ethernet (1000 Mbit)
#
# CONFIG_SK98LIN is not set
# CONFIG_FDDI is not set
# CONFIG_PPP is not set
CONFIG_SLIP=y
CONFIG_SLIP_COMPRESSED=y
# CONFIG_SLIP_SMART is not set
# CONFIG_SLIP_MODE_SLIP6 is not set
# CONFIG_NET_RADIO is not set

#
# Token ring devices
#
# CONFIG_TR is not set
# CONFIG_NET_FC is not set

#
# Wan interfaces
#
# CONFIG_HOSTESS_SV11 is not set
# CONFIG_COSA is not set
# CONFIG_SEALEVEL_4021 is not set
# CONFIG_SYNCLINK_SYNCPPP is not set
# CONFIG_LANMEDIA is not set
# CONFIG_COMX is not set
# CONFIG_DLCI is not set
# CONFIG_WAN_DRIVERS is not set
# CONFIG_XPEED is not set
# CONFIG_SBNI is not set

#
# Amateur Radio support
#
# CONFIG_HAMRADIO is not set

#
# IrDA (infrared) support
#
# CONFIG_IRDA is not set

#
# ISDN subsystem
#
# CONFIG_ISDN is not set

#
# Old CD-ROM drivers (not SCSI, not IDE)
#
# CONFIG_CD_NO_IDESCSI is not set

#
# Character devices
#
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
# CONFIG_SERIAL is not set
# CONFIG_SERIAL_EXTENDED is not set
# CONFIG_SERIAL_NONSTANDARD is not set
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=1024
# CONFIG_MOUSE is not set

#
# Joysticks
#
# CONFIG_JOYSTICK is not set
# CONFIG_QIC02_TAPE is not set
# CONFIG_WATCHDOG is not set
# CONFIG_NVRAM is not set
# CONFIG_RTC is not set
# CONFIG_INTEL_RNG is not set

#
# Video For Linux
#
# CONFIG_VIDEO_DEV is not set
# CONFIG_DTLK is not set

#
# Ftape, the floppy tape device driver
#
# CONFIG_FTAPE is not set

#
# USB support
#
# CONFIG_USB is not set

#
# Filesystems
#
# CONFIG_QUOTA is not set
# CONFIG_AUTOFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_FAT_FS is not set
# CONFIG_MSDOS_FS is not set
# CONFIG_UMSDOS_FS is not set
# CONFIG_VFAT_FS is not set
# CONFIG_ISO9660_FS is not set
# CONFIG_JOLIET is not set
CONFIG_MINIX_FS=y
# CONFIG_NTFS_FS is not set
# CONFIG_HPFS_FS is not set
CONFIG_PROC_FS=y
CONFIG_DEVPTS_FS=y
# CONFIG_ROMFS_FS is not set
CONFIG_EXT2_FS=y
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set

#
# Network File Systems
#
# CONFIG_CODA_FS is not set
# CONFIG_NFS_FS is not set
# CONFIG_NFSD is not set
# CONFIG_SUNRPC is not set
# CONFIG_LOCKD is not set
# CONFIG_SMB_FS is not set
# CONFIG_NCP_FS is not set

#
# Partition Types
#
# CONFIG_BSD_DISKLABEL is not set
# CONFIG_MAC_PARTITION is not set
# CONFIG_SMD_DISKLABEL is not set
# CONFIG_SOLARIS_X86_PARTITION is not set
# CONFIG_NLS is not set

#
# Console drivers
#
CONFIG_VGA_CONSOLE=y
# CONFIG_VIDEO_SELECT is not set

#
# Sound
#
# CONFIG_SOUND is not set

#
# Kernel hacking
#
# CONFIG_MAGIC_SYSRQ is not set
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Please give a try to 2.95.2 19991024 (release) or egcs 1.1.2 or gcc 2.7.2.3. I don't see anything strange in your .config.

Andrea
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