linux 2.2.18pre17 + VM-global -7 = `Negative d

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* linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops
       [not found] ` <20001025050631.A6817@athlon.random>
@ 2000-10-26 17:37   ` Ian Jackson
  2000-10-26 23:05     ` Andrea Arcangeli
  0 siblings, 1 reply; 4+ messages in thread
From: Ian Jackson @ 2000-10-26 17:37 UTC (permalink / raw)
  To: Andrea Arcangeli; +Cc: Linux Kernel Mailing List

Andrea Arcangeli writes ("Re: linux 2.2.18-pre17: "Kernel panic: LRU list corrupted""):
> I also included the fix in a new VM-global patch against vanilla 2.2.18pre17
> (the VM-global patch is available as a single patch inside 2.2.18pre17aa1/
> directory too but I have to maintain a separate version of it against clean
> 2.2.18pre17 due silly rejects that I can't avoid)
> 
> 	ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/patches/v2.2/2.2.18pre17/VM-global-2.2.18pre17-7.bz2

I've been having apparently VM-related `pauses' with 2.2.17 [1], so I
thought I'd try 2.2.18pre17 with that patch.  The results weren't
good: I get many instances of

 Negative d_count (-805538369) for [binary garbage]/<NULL>

followed by an oops.  Kernel logfile extract below, uuencoded.

I'm sure I'd be able to reproduce this, but I'd rather not because
this is a production system.  ver_linux reports:

chiark:linux-2.2.17-chiark> sh scripts/ver_linux
-- Versions installed: (if some fields are empty or looks
-- unusual then possibly you have very old versions)
Linux chiark 2.2.17 #2 Thu Oct 26 10:57:45 BST 2000 i586 unknown
Kernel modules         2.3.11
Gnu C                  2.95.2
Binutils               2.9.5.0.37
Linux C Library        2.1.3
Dynamic linker         ldd: version 1.9.11
Procps                 2.0.6
Mount                  2.10f
Net-tools              2.05
Kbd                    0.99
Sh-utils               2.0
cat: /proc/modules: No such file or directory
Modules Loaded
chiark:linux-2.2.17-chiark>

I don't know why it says `Kernel modules 2.3.11', since I have
disabled kernel modules completely.  My CPU is:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 5
model           : 8
model name      : AMD-K6(tm) 3D processor
stepping        : 0
cpu MHz         : 350.808
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
sep_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr mce cx8 sep mmx 3dnow
bogomips        : 699.60

REPORTING-BUGS wanted me to include /proc/scsi/scsi, so here it is:

Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: IBM      Model: DCAS-34330       Rev: S65A
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: IBM      Model: DCAS-34330       Rev: S65A
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 04 Lun: 00
  Vendor: HP       Model: T20              Rev: 3.01
  Type:   Sequential-Access                ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: IBM      Model: DNES-318350W     Rev: SA30
  Type:   Direct-Access                    ANSI SCSI revision: 03

It might be relevant that a large part of the system's job is to be a
shell account server, and users log in with a variety of mechanisms,
most often OpenSSH (Debian 1.2.3-9).  I've not had any reports from
users about sessions randomly dropping, which I might have expected;
however, I did have a number of background cron jobs die in very
strange ways suggesting killing of processes at random.

The system as a whole is largely Debian 2.2, and has 256Mb of RAM and
about 400Mb of swap.  It usually runs with about 50-100Mb of swap used
and at a load of somewhere around 1ish during busy periods.


[1] VM lockup problem:

I believe that this is a known problem with the 2.2.x VM ?  The
symptoms I have are that under reasonably high but not excessive VM
and/or disk load, the system will freeze for around 10-15 minutes.
Most often this seems to have beeen provoked by a moderately large
(20Mb or so) Emacs doing an auto-save during an otherwise-busy time.

During the lockup network packets are processed - pings receive
replies, and TCP connection attempts succeed, but there is no evidence
of any user-mode executing.  After the lockup the system apparently
just resumes where it left off.  Sometimes afterwards there is a
message like `VM: do_try_to_free_pages failed for emacs...' but more
often there isn't.


Thanks for your attention,

Ian.

begin 664 chiark-oops
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end
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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops
  2000-10-26 17:37   ` linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops Ian Jackson
@ 2000-10-26 23:05     ` Andrea Arcangeli
  2000-10-27 11:14       ` Ian Jackson
  0 siblings, 1 reply; 4+ messages in thread
From: Andrea Arcangeli @ 2000-10-26 23:05 UTC (permalink / raw)
  To: Ian Jackson; +Cc: Linux Kernel Mailing List

On Thu, Oct 26, 2000 at 06:37:37PM +0100, Ian Jackson wrote:
>  Negative d_count (-805538369) for [binary garbage]/<NULL>
> 
> followed by an oops.  Kernel logfile extract below, uuencoded.

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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* Re: linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops
  2000-10-26 23:05     ` Andrea Arcangeli
@ 2000-10-27 11:14       ` Ian Jackson
  2000-10-27 15:42         ` Andrea Arcangeli
  0 siblings, 1 reply; 4+ messages in thread
From: Ian Jackson @ 2000-10-27 11:14 UTC (permalink / raw)
  To: Andrea Arcangeli; +Cc: Linux Kernel Mailing List

Andrea Arcangeli writes ("Re: linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops"):
> On Thu, Oct 26, 2000 at 06:37:37PM +0100, Ian Jackson wrote:
> >  Negative d_count (-805538369) for [binary garbage]/<NULL>
> > 
> > followed by an oops.  Kernel logfile extract below, uuencoded.
> 
> 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?

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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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops
  2000-10-27 11:14       ` Ian Jackson
@ 2000-10-27 15:42         ` Andrea Arcangeli
  0 siblings, 0 replies; 4+ messages in thread
From: Andrea Arcangeli @ 2000-10-27 15:42 UTC (permalink / raw)
  To: Ian Jackson; +Cc: Linux Kernel Mailing List

On Fri, Oct 27, 2000 at 12:14:56PM +0100, Ian Jackson wrote:
> gcc version 2.95.2 20000220 (Debian GNU/Linux)

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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the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2000-10-27 15:42 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <39F4AB91.72F2C300@transmeta.com>
     [not found] ` <20001025050631.A6817@athlon.random>
2000-10-26 17:37   ` linux 2.2.18pre17 + VM-global -7 = `Negative d_count' oops Ian Jackson
2000-10-26 23:05     ` Andrea Arcangeli
2000-10-27 11:14       ` Ian Jackson
2000-10-27 15:42         ` Andrea Arcangeli

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