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    Subject[bug] 2.4.18 Call Trace: [link_path_walk+889/2008] [path_walk+26/28] [open_namei+131/1596] [filp_open+59/92] [sys_open+54/204] [system_call+51/56]
    From
    Date
    I'm not sure if I should be sending an oops from a Debian 2.4.18 kernel
    or not? ... this may be useful. I'm not subscribed to the list.

    [1.] One line summary of the problem:

    unable to handle kernel NULL pointer dereference at virtual address 00000081

    [2.] Full description of the problem/report:

    I found this oops in the kern.log on one of our machines and thought it
    might be useful?

    [3.] Keywords (i.e., modules, networking, kernel):

    kernel, seems to be filesystem.

    [4.] Kernel version (from /proc/version):

    Linux version 2.4.18-686-smp (herbert@gondolin) (gcc version 2.95.4 (Debian prerelease)) #2 SMP Wed Mar 20 20:24:14 EST 2002

    [5.] Output of Oops.. message (if applicable) with symbolic information
    resolved (see Documentation/oops-tracing.txt)

    kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000081
    kernel: printing eip:
    kernel: 00000081
    kernel: *pde = 00000000
    kernel: Oops: 0000
    kernel: CPU: 1
    kernel: EIP: 0010:[<00000081>] Not tainted
    kernel: EFLAGS: 00010292
    kernel: eax: 00000081 ebx: cf368000 ecx: dfcc65e8 edx: dfcc6408
    kernel: esi: ffffffec edi: cf369f8c ebp: dfcc51a0 esp: cf369f0c
    kernel: ds: 0018 es: 0018 ss: 0018
    kernel: Process sendmail (pid: 12491, stackpage=cf369000)
    kernel: Stack: c01400b1 dfcc51a0 cf369f8c dfcc6400 00000001 00000000 c2b51000 cf369f8c
    kernel: 00000001 c2b51006 dfcc51a0 c2b51001 00000004 01baa5b4 c014052a c0140baf
    kernel: 000001b6 c2b51000 00000000 bfffd1bc 00000000 00000000 00000004 00000286
    kernel: Call Trace: [link_path_walk+889/2008] [path_walk+26/28] [open_namei+131/1596] [filp_open+59/92] [sys_open+54/204]
    kernel: [system_call+51/56]
    kernel:
    kernel: Code: Bad EIP value.

    [6.] A small shell script or example program which triggers the
    problem (if possible)

    Can't seem to reproduce manually, but these happen every now and again.

    [7.] Environment

    Debian/linux mail server, with quite high average load.

    [7.1.] Software (add the output of the ver_linux script here)

    This is not the same machine that the kernel was compiled on.

    Linux xxxx 2.4.18-686-smp #2 SMP Wed Mar 20 20:24:14 EST 2002 i686 unknown

    Gnu C 2.95.4
    Gnu make 3.79.1
    util-linux 2.11n
    mount 2.11n
    modutils 2.4.15
    e2fsprogs 1.27
    reiserfsprogs 3.x.1b
    PPP 2.4.1
    Linux C Library 2.2.5
    Dynamic linker (ldd) 2.2.5
    Procps 2.0.7
    Net-tools 1.60
    Console-tools 0.2.3
    Sh-utils 2.0.11
    Modules Loaded dummy0 ipx reiserfs eepro100 rtc unix DAC960 ext2 ext3 jbd

    [7.2.] Processor information (from /proc/cpuinfo):

    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 8
    model name : Pentium III (Coppermine)
    stepping : 3
    cpu MHz : 733.016
    cache size : 256 KB
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 2
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
    bogomips : 1461.45

    processor : 1
    vendor_id : GenuineIntel
    cpu family : 6
    model : 8
    model name : Pentium III (Coppermine)
    stepping : 3
    cpu MHz : 733.016
    cache size : 256 KB
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 2
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
    bogomips : 1464.72

    [7.3.] Module information (from /proc/modules):

    dummy0 960 0 (autoclean) (unused)
    ipx 18548 3 (autoclean)
    reiserfs 153184 1
    eepro100 17616 1
    rtc 6104 0 (autoclean)
    unix 15236 26 (autoclean)
    DAC960 58304 4 (autoclean)
    ext2 31840 0 (autoclean) (unused)
    ext3 58848 2 (autoclean)
    jbd 38056 2 (autoclean) [ext3]

    [7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)

    # cat /proc/ioports
    0000-001f : dma1
    0020-003f : pic1
    0040-005f : timer
    0060-006f : keyboard
    0070-007f : rtc
    0080-008f : dma page reg
    00a0-00bf : pic2
    00c0-00df : dma2
    00f0-00ff : fpu
    02f8-02ff : serial(set)
    03c0-03df : vga+
    03f8-03ff : serial(set)
    0cf8-0cff : PCI conf1
    c000-cfff : PCI Bus #01
    d800-d83f : Intel Corp. 82557 [Ethernet Pro 100]
    d800-d83f : eepro100
    ffa0-ffaf : ServerWorks OSB4 IDE Controller

    # cat /proc/iomem
    00000000-0009fbff : System RAM
    0009fc00-0009ffff : reserved
    000a0000-000bffff : Video RAM area
    000c0000-000c7fff : Video ROM
    000f0000-000fffff : System ROM
    00100000-1ffeffff : System RAM
    00100000-001e128a : Kernel code
    001e128b-0021fc7f : Kernel data
    1fff0000-1fffefff : ACPI Tables
    1ffff000-1fffffff : ACPI Non-volatile Storage
    20000000-20000fff : ServerWorks OSB4/CSB5 OHCI USB Controller
    f8400000-f84fffff : PCI Bus #01
    fa000000-fbffffff : nVidia Corporation Vanta [NV6]
    fc5fe000-fc5fffff : Mylex Corporation DAC960PX
    fc700000-fc7fffff : PCI Bus #01
    fd000000-fdffffff : nVidia Corporation Vanta [NV6]
    fe900000-fe9fffff : Intel Corp. 82557 [Ethernet Pro 100]
    feae7000-feae7fff : Intel Corp. 82557 [Ethernet Pro 100]
    feae7000-feae7fff : eepro100
    fec00000-fec01fff : reserved
    fee00000-fee00fff : reserved
    fff80000-ffffffff : reserved

    [7.5.] PCI information ('lspci -vvv' as root)

    00:00.0 Host bridge: ServerWorks CNB20LE Host Bridge (rev 05)
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
    Latency: 32, cache line size 08

    00:00.1 Host bridge: ServerWorks CNB20LE Host Bridge (rev 05)
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 16, cache line size 08

    00:01.0 PCI bridge: Intel Corp. 80960RP [i960 RP Microprocessor/Bridge] (rev 03) (prog-if 00 [Normal decode])
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 32, cache line size 08
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
    I/O behind bridge: 0000c000-0000cfff
    Memory behind bridge: fc700000-fc7fffff
    Prefetchable memory behind bridge: f8400000-f84fffff
    BridgeCtl: Parity+ SERR+ NoISA- VGA- MAbort- >Reset- FastB2B-

    00:01.1 RAID bus controller: Mylex Corporation DAC960PX (rev 03)
    Subsystem: Mylex Corporation DAC960PX
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 32, cache line size 08
    Interrupt: pin A routed to IRQ 16
    Region 0: Memory at fc5fe000 (32-bit, prefetchable) [size=8K]
    Expansion ROM at feae8000 [disabled] [size=32K]

    00:02.0 VGA compatible controller: nVidia Corporation Vanta [NV6] (rev 15) (prog-if 00 [VGA])
    Subsystem: nVidia Corporation: Unknown device 0006
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 32 (1250ns min, 250ns max)
    Interrupt: pin A routed to IRQ 18
    Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
    Region 1: Memory at fa000000 (32-bit, prefetchable) [size=32M]
    Expansion ROM at feaf0000 [disabled] [size=64K]
    Capabilities: [60] Power Management version 1
    Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
    Status: D0 PME-Enable- DSel=0 DScale=0 PME-

    00:06.0 Ethernet controller: Intel Corp. 82557 [Ethernet Pro 100] (rev 08)
    Subsystem: Intel Corp. 82559 Fast Ethernet LAN on Motherboard
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
    Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 32 (2000ns min, 14000ns max), cache line size 08
    Interrupt: pin A routed to IRQ 31
    Region 0: Memory at feae7000 (32-bit, non-prefetchable) [size=4K]
    Region 1: I/O ports at d800 [size=64]
    Region 2: Memory at fe900000 (32-bit, non-prefetchable) [size=1M]
    Capabilities: [dc] Power Management version 2
    Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
    Status: D0 PME-Enable- DSel=0 DScale=2 PME-

    00:0f.0 ISA bridge: ServerWorks OSB4 South Bridge (rev 4f)
    Subsystem: ServerWorks OSB4 South Bridge
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 0

    00:0f.1 IDE interface: ServerWorks OSB4 IDE Controller (prog-if 8a [Master SecP PriP])
    Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 64
    Region 4: I/O ports at ffa0 [size=16]

    00:0f.2 USB Controller: ServerWorks OSB4/CSB5 OHCI USB Controller (rev 04) (prog-if 10 [OHCI])
    Subsystem: ServerWorks OSB4/CSB5 OHCI USB Controller
    Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Interrupt: pin A routed to IRQ 0
    Region 0: Memory at 20000000 (32-bit, non-prefetchable) [disabled] [size=4K]

    [7.6.] SCSI information (from /proc/scsi/scsi)

    not reported in /proc, but using hardware RAID controller as above.

    [7.7.] Other information that might be relevant to the problem
    (please look in /proc and include all information that you
    think to be relevant):

    [X.] Other notes, patches, fixes, workarounds:

    kernel-source for DEBIAN
    ------------------------

    These patches were applied:

    * NFS client seekdir patch
    http://www.fys.uio.no/~trondmy/src/

    These modifications were also made:

    * Fixed a couple of argument processing bugs in main.c (Eric Delaunay).
    * Added initrd support for cramfs.
    * Exported proc_get_inode.
    * Hacked ide_xlate_1024 to work when IDE is modularised.
    * Fixed pegasus_set_multicast lockup.
    * Work around 21143 (rev 65) select_media bug in drivers/net/tulip/21142.c.
    * Fixed dead lock on shutdown in 8139too.
    * Allow ECN to be compiled in but disabled.
    * Removed non-free Keyspan firmware.
    * Don't kill page cache entries in set_blocksize.
    * Added support for nm256xl+ (Mattia Monga).
    * Fixed handling of HIDs with product strings bug no manufacturer.
    * CONFIG_SERIAL_ACPI now depends on CONFIG_SERIAL == y.
    * Fixed negative inode numbers in /proc/net (Arnaud Giersch).
    * pcnet32_purge_tx_ring may be called from IRQ context (Darren Salt).
    * Check old_bbpnt in drivers/scsi/sr.c (2.5).
    * Removed CONFIG_FT_ALPHA_CLOCK.
    * Export est_cycle_freq (needed for removing CONFIG_FT_ALPHA_CLOCK).
    * Fixed the use of return values from mem*_io in drivers/isdn/sc.
    * Added missing headers in drivers/pcmcia/i82092.c.
    * Fixed compile error in drivers/scsi/dpt_i2o.c on alpha.
    * Removed -g from driviers/atm/Makefile.
    * Added missing personality patch to fs/binfmt_elf.c.
    * Extern inline -> static inline in
    drivers/char/specialx.c
    drivers/net/hamradio/soundmodem
    * Added asm/io.h for in*/out* to
    drivers/isdn/hisax/hisax_fcpcipnp.c
    drivers/net/wan/farsync.c
    * Fixed double free in
    drivers/net/zlib.c
    fs/jffs2/zlib.c

    Changes to comments and documentation:

    * Fixed typos in asm/socket.h.
    * Fixed a typo in Documentation/sound/VIBRA16 (Carlos Valdivia Yag<FC>e).
    * Fixed a typo in Documentation/sound/OPL3-SA (Carlos Valdivia Yag<FC>e).
    * Fixed comment about epochs in arch/alpha/kernel/time.c.

    Herbert Xu <herbert@debian.org>
    $Id: README.Debian,v 1.49 2002/03/13 09:24:21 herbert Exp $

    --
    Jon Miles <jon@cybah.co.uk>
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