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    SubjectDefect (Bug) Report
    [1.] One line summary of the problem:

    Defect is kernel hang on Dual Processor, Athlon MP system.

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

    The system regularly experiences short (from 1 to 5 seconds)
    hangs where both processors appear to be "hung". Most often,
    the system will recover, but in three different cases the
    system has hung "permanently" (for values of "permanently"
    ranging from 10 minutes, to at most four hours before I gave
    up and hit reset).

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

    SMP issue. My current WAG is that this is some kind of spinlock
    issue related to allocating huge amounts of memory in user space
    programs (up to three times the actual installed core).

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

    Linux version 2.4.18 (root@morningstar) (gcc version 2.95.4
    20011002 (Debian prerelease)) #13 SMP Sat Jan 18 13:21:01 MST 2003

    [5.] Output of Oops.

    Sorry, but since the system hung, there was no Oops.

    I am an HPUX kernel developer in my "real job". On our systems,
    in this situation, I would execute a TOC (transfer of control)
    then attempt to analyze the dump to see what the processors
    where doing.

    Is there a recognized standard procedure for creating such a
    dump under Linux?

    Sadly, PC hardware does not have support for "TOC", but if
    there is some other method that has been developed to do
    this, one that does not negatively impact normal system operation
    and performance, I will set it up.

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

    Sorry, but this seems to be intermittent. Attempts to reproduce
    this have generated intermittent hangs (allocate from three to
    four times MAX physical core), but do not guarantee a complete
    system hang.

    [7.] Environment

    ???

    Is this physical, network, hardware, what?

    OK, hardware then:

    Memory : 512 MBytes, ECC, 266 MHz FSB.
    Disk : All SCSI. See below.
    Mother Board: Tyan Tiger MPX S2466N
    Networking : Two ethernet cards, one 10 Mbps, one 100 Mbps.

    Adquate cooling and power.

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


    If some fields are empty or look unusual you may have an old version.
    Compare to the current minimal requirements in Documentation/Changes.

    Linux morningstar 2.4.18 #13 SMP Sat Jan 18 13:21:01 MST 2003 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
    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

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

    processor : 0
    vendor_id : AuthenticAMD
    cpu family : 6
    model : 6
    model name : AMD Athlon(tm) MP 1900+
    stepping : 2
    cpu MHz : 1600.063
    cache size : 256 KB
    fdiv_bug : no
    hlt_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 pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
    bogomips : 3191.60

    processor : 1
    vendor_id : AuthenticAMD
    cpu family : 6
    model : 6
    model name : AMD Athlon(tm) Processor
    stepping : 2
    cpu MHz : 1600.063
    cache size : 256 KB
    fdiv_bug : no
    hlt_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 pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
    bogomips : 3198.15

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

    This is an entirely static system . . . no modules.

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

    0000-001f : dma1
    0020-003f : pic1
    0040-005f : timer
    0060-006f : keyboard
    0080-008f : dma page reg
    00a0-00bf : pic2
    00c0-00df : dma2
    00f0-00ff : fpu
    01f0-01f7 : ide0
    02f8-02ff : serial(auto)
    0378-037a : parport0
    037b-037f : parport0
    03c0-03df : vga+
    03f6-03f6 : ide0
    03f8-03ff : serial(set)
    0cf8-0cff : PCI conf1
    1010-1013 : PCI device 1022:700c (Advanced Micro Devices [AMD])
    2000-2fff : PCI Bus #02
    2000-20ff : Adaptec AHA-2940U2/W
    2000-20ff : aic7xxx
    2400-247f : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3]
    2400-247f : tulip
    2480-24ff : 3Com Corporation 3c905C-TX [Fast Etherlink]
    2480-24ff : 02:08.0
    2800-283f : Ensoniq ES1371 [AudioPCI-97]
    2800-283f : es1371
    f000-f00f : Advanced Micro Devices [AMD] AMD-768 [??] IDE
    f000-f007 : ide0
    f008-f00f : ide1

    00000000-0009f7ff : System RAM
    0009f800-0009ffff : reserved
    000a0000-000bffff : Video RAM area
    000c0000-000c7fff : Video ROM
    000cc800-000ccfff : Extension ROM
    000cd000-000d27ff : Extension ROM
    000e0000-000effff : Extension ROM
    000f0000-000fffff : System ROM
    00100000-1feeffff : System RAM
    00100000-002ab6e4 : Kernel code
    002ab6e5-0033487f : Kernel data
    1fef0000-1fefefff : ACPI Tables
    1feff000-1fefffff : ACPI Non-volatile Storage
    1ff00000-1ff7ffff : System RAM
    1ff80000-1fffffff : reserved
    e8000000-e8ffffff : PCI Bus #01
    e8000000-e8ffffff : nVidia Corporation NV11 (GeForce2 MX)
    e9000000-e90fffff : PCI Bus #02
    e9000000-e9000fff : Advanced Micro Devices [AMD] AMD-768 [??] USB
    e9000000-e9000fff : usb-ohci
    e9001000-e9001fff : Adaptec AHA-2940U2/W
    e9001000-e9001fff : aic7xxx
    e9002000-e900207f : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3]
    e9002000-e900207f : tulip
    e9002400-e900247f : 3Com Corporation 3c905C-TX [Fast Etherlink]
    e9300000-e9300fff : PCI device 1022:700c (Advanced Micro Devices [AMD])
    ec000000-efffffff : PCI device 1022:700c (Advanced Micro Devices [AMD])
    f0000000-f7ffffff : PCI Bus #01
    f0000000-f7ffffff : nVidia Corporation NV11 (GeForce2 MX)
    fec00000-fec03fff : reserved
    fee00000-fee00fff : reserved
    fff80000-ffffffff : reserved

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


    00:00.0 Host bridge: Advanced Micro Devices [AMD]: Unknown device 700c (rev 11)
    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 0: Memory at ec000000 (32-bit, prefetchable) [size=64M]
    Region 1: Memory at e9300000 (32-bit, prefetchable) [size=4K]
    Region 2: I/O ports at 1010 [disabled] [size=4]
    Capabilities: [a0] AGP version 2.0
    Status: RQ=15 SBA+ 64bit- FW- Rate=x1,x2
    Command: RQ=0 SBA+ AGP+ 64bit- FW- Rate=<none>

    00:01.0 PCI bridge: Advanced Micro Devices [AMD]: Unknown device 700d (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: 99
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=68
    I/O behind bridge: 0000f000-00000fff
    Memory behind bridge: e8000000-e8ffffff
    Prefetchable memory behind bridge: f0000000-f7ffffff
    BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-

    00:07.0 ISA bridge: Advanced Micro Devices [AMD]: Unknown device 7440 (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: 0

    00:07.1 IDE interface: Advanced Micro Devices [AMD]: Unknown device 7441 (rev 04) (prog-if 8a [Master SecP PriP])
    Subsystem: Advanced Micro Devices [AMD]: Unknown device 7441
    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
    Region 4: I/O ports at f000 [size=16]

    00:07.3 Bridge: Advanced Micro Devices [AMD]: Unknown device 7443 (rev 03)
    Subsystem: Advanced Micro Devices [AMD]: Unknown device 7443
    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-

    00:10.0 PCI bridge: Advanced Micro Devices [AMD]: Unknown device 7448 (rev 05) (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: 64
    Bus: primary=00, secondary=02, subordinate=02, sec-latency=168
    I/O behind bridge: 00002000-00002fff
    Memory behind bridge: e9000000-e90fffff
    Prefetchable memory behind bridge: fff00000-000fffff
    BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-

    01:05.0 VGA compatible controller: nVidia Corporation NV11 (GeForce2 MX) (rev b2) (prog-if 00 [VGA])
    Subsystem: VISIONTEK: Unknown device 0023
    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 18
    Region 0: Memory at e8000000 (32-bit, non-prefetchable) [size=16M]
    Region 1: Memory at f0000000 (32-bit, prefetchable) [size=128M]
    Expansion ROM at <unassigned> [disabled] [size=64K]
    Capabilities: [60] Power Management version 2
    Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
    Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [44] AGP version 2.0
    Status: RQ=31 SBA- 64bit- FW+ Rate=x1,x2
    Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

    02:00.0 USB Controller: Advanced Micro Devices [AMD]: Unknown device 7449 (rev 07) (prog-if 10 [OHCI])
    Subsystem: Advanced Micro Devices [AMD]: Unknown device 7449
    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 (20000ns max)
    Interrupt: pin D routed to IRQ 19
    Region 0: Memory at e9000000 (32-bit, non-prefetchable) [size=4K]

    02:04.0 SCSI storage controller: Adaptec AHA-2940U2/W
    Subsystem: Adaptec: Unknown device a180
    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 (9750ns min, 6250ns max), cache line size 10
    Interrupt: pin A routed to IRQ 16
    BIST result: 00
    Region 0: I/O ports at 2000 [disabled] [size=256]
    Region 1: Memory at e9001000 (64-bit, non-prefetchable) [size=4K]
    Expansion ROM at <unassigned> [disabled] [size=128K]
    Capabilities: [dc] 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-

    02:05.0 Ethernet controller: Digital Equipment Corporation DECchip 21041 [Tulip Pass 3] (rev 21)
    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
    Interrupt: pin A routed to IRQ 17
    Region 0: I/O ports at 2400 [size=128]
    Region 1: Memory at e9002000 (32-bit, non-prefetchable) [size=128]
    Expansion ROM at <unassigned> [disabled] [size=256K]

    02:07.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 08)
    Subsystem: Ensoniq Creative Sound Blaster AudioPCI64V, AudioPCI128
    Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 64 (3000ns min, 32000ns max)
    Interrupt: pin A routed to IRQ 19
    Region 0: I/O ports at 2800 [size=64]
    Capabilities: [dc] 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-

    02:08.0 Ethernet controller: 3Com Corporation 3c905C-TX [Fast Etherlink] (rev 78)
    Subsystem: Tyan Computer: Unknown device 2466
    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: 80 (2500ns min, 2500ns max), cache line size 10
    Interrupt: pin A routed to IRQ 19
    Region 0: I/O ports at 2480 [size=128]
    Region 1: Memory at e9002400 (32-bit, non-prefetchable) [size=128]
    Expansion ROM at <unassigned> [disabled] [size=128K]
    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-

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

    Attached devices:
    Host: scsi0 Channel: 00 Id: 00 Lun: 00
    Vendor: QUANTUM Model: ATLAS10K2-TY092L Rev: DA40
    Type: Direct-Access ANSI SCSI revision: 03
    Host: scsi0 Channel: 00 Id: 01 Lun: 00
    Vendor: QUANTUM Model: ATLAS10K2-TY092L Rev: DA40
    Type: Direct-Access ANSI SCSI revision: 03
    Host: scsi0 Channel: 00 Id: 02 Lun: 00
    Vendor: QUANTUM Model: ATLAS10K2-TY092L Rev: DA40
    Type: Direct-Access ANSI SCSI revision: 03
    Host: scsi1 Channel: 00 Id: 00 Lun: 00
    Vendor: SAMSUNG Model: CD-R/RW SW-240B Rev: R401
    Type: CD-ROM ANSI SCSI revision: 02

    [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):

    I had a great deal of difficulty getting an IDE based SamSung
    CD/RW drive working on this system.

    I had to play around with "Sharing PCI IDE interrupts support",
    and "Use PCI DMA by default when available" options in the
    kernel configuration to find a configuration that would not
    hang the kernel when attempting to burn a CDR.

    So, to obtain further information, I would need some kind of ability
    to force an Oops . . . can this be done with SysReq hot keys? There
    doesn't appear to be any indication that this is the case.

    For starters, I've gone in and activated Magic SysReq key (just in case),
    spinlock debugging (best guess as to reason of hang), and verbose BUG
    reporting (for luck!).

    Any other suggestions, or recommendations to get more info?

    Thanks,
    John S.
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