[Xen-devel] GPF error message from hypervisor

[Andrew Ball <anball@xxxxxxxxx>]

Greetings.  With changeset 7425:7c951e3eb5ab, I'm getting the
following error message over and over again when I look at 'xm dmesg'
on an IBM HS20 (8843) blade:

(XEN) (file=extable.c, line=77) Pre-exception: ff137a42 -> ff143942
(XEN) (file=traps.c, line=1061) GPF (ff3c): ff143964 -> ff143975
(XEN) (file=extable.c, line=77) Pre-exception: ff137a42 -> ff143942
(XEN) (file=traps.c, line=1061) GPF (ff3c): ff143964 -> ff143975
(XEN) (file=extable.c, line=77) Pre-exception: ff137a42 -> ff143942
(XEN) (file=traps.c, line=1061) GPF (ff8c): ff143964 -> ff143975
(XEN) (file=extable.c, line=77) Pre-exception: ff137a42 -> ff143942
(XEN) (file=traps.c, line=1061) GPF (ff8c): ff143964 -> ff143975
(XEN) (file=extable.c, line=77) Pre-exception: ff137a42 -> ff143942
(XEN) (file=traps.c, line=1061) GPF (ff3c): ff143964 -> ff143975

Here's the code surrounding the second error message, from xen/arch/x86/traps.c:
 gp_in_kernel:

    if ( likely((fixup = search_exception_table(regs->eip)) != 0) )
    {
        DPRINTK("GPF (%04x): %p -> %p\n",
                regs->error_code, _p(regs->eip), _p(fixup));
        regs->eip = fixup;
        return 0;
    }

As you can see, regs->error_code alternates between ff8c and ff3c.

What does this mean?  Is it serious?  It seems that I can only
reproduce this if I have IBM Director installed on the blade, so it
could be triggered by something that the Director code is doing.

Thanks for your help.
Andrew

Here's a copy of the output from Xen and XenoLinux on boot:
 \ \/ /___ _ __   |___ / / _ \     __| | _____   _____| |
  \  // _ \ '_ \    |_ \| | | |__ / _` |/ _ \ \ / / _ \ |
  /  \  __/ | | |  ___) | |_| |__| (_| |  __/\ V /  __/ |
 /_/\_\___|_| |_| |____(_)___/    \__,_|\___| \_/ \___|_|

 http://www.cl.cam.ac.uk/netos/xen
 University of Cambridge Computer Laboratory

 Xen version 3.0-devel (andrew@localdomain) (gcc version 3.4.3
20041212 (Red Hat 3.4.3-9.EL4)) Wed Oct 19 16:02:27 EDT 2005
 Latest ChangeSet: Wed Oct 19 06:53:00 2005 +0100 7425:7c951e3eb5ab

(XEN) Physical RAM map:
(XEN)  0000000000000000 - 000000000009d400 (usable)
(XEN)  000000000009d400 - 00000000000a0000 (reserved)
(XEN)  00000000000e0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000003ffbe640 (usable)
(XEN)  000000003ffbe640 - 000000003ffd0000 (ACPI data)
(XEN)  000000003ffd0000 - 0000000040000000 (reserved)
(XEN)  00000000fec00000 - 0000000100000000 (reserved)
(XEN) System RAM: 1023MB (1047916kB)
(XEN) Xen heap: 10MB (10656kB)
(XEN) PAE disabled.
(XEN) found SMP MP-table at 0009d540
(XEN) DMI 2.3 present.
(XEN) Using APIC driver default
(XEN) ACPI: RSDP (v000 IBM                                   ) @ 0x000fdfc0
(XEN) ACPI: RSDT (v001 IBM    SERBLADE 0x00001000 IBM  0x45444f43) @ 0x3ffcff80
(XEN) ACPI: FADT (v002 IBM    SERBLADE 0x00001000 IBM  0x45444f43) @ 0x3ffcfec0
(XEN) ACPI: MADT (v001 IBM    SERBLADE 0x00001000 IBM  0x45444f43) @ 0x3ffcfe00
(XEN) ACPI: MCFG (v001 IBM    SERBLADE 0x00001000 IBM  0x45444f43) @ 0x3ffcfdc0
(XEN) ACPI: DSDT (v001 IBM    SERBLADE 0x00001000 INTL 0x02002025) @ 0x00000000
(XEN) ACPI: Local APIC address 0xfee00000
(XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
(XEN) Processor #0 15:4 APIC version 20
(XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
(XEN) Processor #1 15:4 APIC version 20
(XEN) ACPI: LAPIC_NMI (acpi_id[0x00] dfl dfl lint[0x1])
(XEN) ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
(XEN) ACPI: IOAPIC (id[0x0e] address[0xfec00000] gsi_base[0])
(XEN) IOAPIC[0]: apic_id 14, version 32, address 0xfec00000, GSI 0-23
(XEN) ACPI: IOAPIC (id[0x0d] address[0xfec10000] gsi_base[24])
(XEN) IOAPIC[1]: apic_id 13, version 32, address 0xfec10000, GSI 24-47
(XEN) ACPI: IOAPIC (id[0x0c] address[0xfec81000] gsi_base[48])
(XEN) IOAPIC[2]: apic_id 12, version 32, address 0xfec81000, GSI 48-71
(XEN) ACPI: IOAPIC (id[0x0b] address[0xfec81400] gsi_base[72])
(XEN) IOAPIC[3]: apic_id 11, version 32, address 0xfec81400, GSI 72-95
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
(XEN) ACPI: IRQ0 used by override.
(XEN) ACPI: IRQ2 used by override.
(XEN) ACPI: IRQ11 used by override.
(XEN) Enabling APIC mode:  Flat.  Using 4 I/O APICs
(XEN) Using ACPI (MADT) for SMP configuration information
(XEN) Initializing CPU#0
(XEN) Detected 3200.208 MHz processor.
(XEN) Using scheduler: Simple EDF Scheduler (sedf)
(XEN) CPU: Trace cache: 12K uops, L1 D cache: 16K
(XEN) CPU: L2 cache: 2048K
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU0: Intel(R) Xeon(TM) CPU 3.20GHz stepping 03
(XEN) Booting processor 1/1 eip 90000
(XEN) Initializing CPU#1
(XEN) CPU: Trace cache: 12K uops, L1 D cache: 16K
(XEN) CPU: L2 cache: 2048K
(XEN) CPU: Physical Processor ID: 0
(XEN) CPU1: Intel(R) Xeon(TM) CPU 3.20GHz stepping 03
(XEN) Total of 2 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN) ..TIMER: vector=0x31 pin1=2 pin2=-1
(XEN) checking TSC synchronization across 2 CPUs: passed.
(XEN) Platform timer is 1.193MHz PIT
(XEN) Brought up 2 CPUs
(XEN) mtrr: v2.0 (20020519)
(XEN) *** LOADING DOMAIN 0 ***
(XEN) Xen-ELF header found:
'GUEST_OS=linux,GUEST_VER=2.6,XEN_VER=3.0,VIRT_BASE=0xC0000000,PAE=no,LOADER=generic'
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   3f000000->3f800000 (129024 pages to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: c0100000->c061aca4
(XEN)  Init. ramdisk: c061b000->c06ad200
(XEN)  Phys-Mach map: c06ae000->c072e000
(XEN)  Start info:    c072e000->c072f000
(XEN)  Page tables:   c072f000->c0732000
(XEN)  Boot stack:    c0732000->c0733000
(XEN)  TOTAL:         c0000000->c0800000
(XEN)  ENTRY ADDRESS: c0100000
(XEN) Initrd len 0x92200, start at 0xc061b000
(XEN) Scrubbing Free RAM: ...........done.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen).
Linux version 2.6.12.5-xen0 (andrew@ibmhc1blade10) (gcc version 3.4.3
20041212 (Red Hat 3.4.3-9.EL4)) #1 Wed Oct 19 16:10:10 EDT 2005
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000020000000 (usable)
0MB HIGHMEM available.
512MB LOWMEM available.
DMI 2.3 present.
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
ACPI: LAPIC_NMI (acpi_id[0x00] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
ACPI: IOAPIC (id[0x0e] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 14, version 32, address 0xfec00000, GSI 0-23
ACPI: IOAPIC (id[0x0d] address[0xfec10000] gsi_base[24])
IOAPIC[1]: apic_id 13, version 32, address 0xfec10000, GSI 24-47
ACPI: IOAPIC (id[0x0c] address[0xfec81000] gsi_base[48])
IOAPIC[2]: apic_id 12, version 32, address 0xfec81000, GSI 48-71
ACPI: IOAPIC (id[0x0b] address[0xfec81400] gsi_base[72])
IOAPIC[3]: apic_id 11, version 32, address 0xfec81400, GSI 72-95
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
Enabling APIC mode:  Flat.  Using 4 I/O APICs
Using ACPI (MADT) for SMP configuration information
IRQ lockup detection disabled
Allocating PCI resources starting at 40000000 (gap: 40000000:bec00000)
Built 1 zonelists
Kernel command line: ro root=LABEL=/ 3
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 65536 bytes)
Xen reported: 3200.208 MHz processor.
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Software IO TLB disabled
vmalloc area: e0800000-fb7fe000, maxmem 34000000
Memory: 512256k/524288k available (3536k kernel code, 11844k reserved,
1033k data, 352k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Mount-cache hash table entries: 512
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 2048K
CPU: Intel(R) Xeon(TM) CPU 3.20GHz stepping 03
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... disabled
ENABLING IO-APIC IRQs
checking if image is initramfs... it is
Freeing initrd memory: 584k freed
NET: Registered protocol family 16
xenbus_probe_init
PCI: Using MMCONFIG
ACPI: Subsystem revision 20050309
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (0000:00)
PCI: Probing PCI hardware (bus 00)
PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1
PCI: Transparent bridge - 0000:00:1e.0
ACPI: PCI Interrupt Link [LP00] (IRQs *10)
ACPI: PCI Interrupt Link [LP01] (IRQs *7)
ACPI: PCI Interrupt Link [LP02] (IRQs *5)
ACPI: PCI Interrupt Link [LP03] (IRQs *5)
ACPI: PCI Interrupt Link [LP04] (IRQs *10)
ACPI: PCI Interrupt Link [LP05] (IRQs) *0, disabled.
ACPI: PCI Interrupt Link [LP06] (IRQs *10)
ACPI: PCI Interrupt Link [LP07] (IRQs) *0, disabled.
xen_mem: Initialising balloon driver.
SCSI subsystem initialized
usbcore: registered new driver hub
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq".  If it helps, post a report
PCI: Cannot allocate resource region 1 of device 0000:00:00.0
Grant table initialized
IA-32 Microcode Update Driver: v1.14-xen <tigran@xxxxxxxxxxx>
Initializing Cryptographic API
i8042.c: Can't read CTR while initializing i8042.
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
Floppy drive(s): fd0 is 1.44M
floppy0: no floppy controllers found
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
HP CISS Driver (v 2.6.6)
Intel(R) PRO/1000 Network Driver - version 6.0.54-k2
Copyright (c) 1999-2004 Intel Corporation.
pcnet32.c:v1.30j 29.04.2005 tsbogend@xxxxxxxxxxxxxxxx
e100: Intel(R) PRO/100 Network Driver, 3.4.8-k2-NAPI
e100: Copyright(c) 1999-2005 Intel Corporation
tg3.c:v3.31 (June 8, 2005)
ACPI: PCI Interrupt 0000:05:01.0[A] -> GSI 77 (level, low) -> IRQ 77
eth0: Tigon3 [partno(BCM95704A41) rev 2100 PHY(serdes)]
(PCIX:133MHz:64-bit) 10/100/1000BaseT Ethernet 00:11:25:9c:25:d8
eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] Split[0] WireSpeed[1] TSOcap[0]
eth0: dma_rwctrl[769f4000]
ACPI: PCI Interrupt 0000:05:01.1[B] -> GSI 78 (level, low) -> IRQ 78
eth1: Tigon3 [partno(BCM95704A41) rev 2100 PHY(serdes)]
(PCIX:133MHz:64-bit) 10/100/1000BaseT Ethernet 00:11:25:9c:25:d9
eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] Split[0] WireSpeed[1] TSOcap[1]
eth1: dma_rwctrl[769f4000]
tun: Universal TUN/TAP device driver, 1.6
tun: (C) 1999-2004 Max Krasnyansky <maxk@xxxxxxxxxxxx>
Xen virtual console successfully installed as ttyS0
Event-channel device installed.
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
ICH5: IDE controller at PCI slot 0000:00:1f.1
ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 14 (level, low) -> IRQ 14
ICH5: chipset revision 2
ICH5: not 100% native mode: will probe irqs later
ICH5: neither IDE port enabled (BIOS)
Red Hat/Adaptec aacraid driver (1.1.2-lk2 Oct 19 2005)
3ware Storage Controller device driver for Linux v1.26.02.001.
Fusion MPT base driver 3.01.20
Copyright (c) 1999-2004 LSI Logic Corporation
ACPI: PCI Interrupt 0000:02:01.0[A] -> GSI 24 (level, low) -> IRQ 24
mptbase: Initiating ioc0 bringup
ioc0: 53C1030: Capabilities={Initiator}
Fusion MPT SCSI Host driver 3.01.20
scsi0 : ioc0: LSI53C1030, FwRev=01032821h, Ports=1, MaxQ=222, IRQ=24
  Vendor: LSILOGIC  Model: 1030 IM           Rev: 1000
  Type:   Direct-Access                      ANSI SCSI revision: 02
SCSI device sda: 143372288 512-byte hdwr sectors (73407 MB)
SCSI device sda: drive cache: write through
SCSI device sda: 143372288 512-byte hdwr sectors (73407 MB)
SCSI device sda: drive cache: write through
 sda: sda1 sda2 sda3
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
usbmon: debugs is not available
USB Universal Host Controller Interface driver v2.2
ACPI: PCI Interrupt 0000:00:1d.0[A] -> GSI 16 (level, low) -> IRQ 16
uhci_hcd 0000:00:1d.0: UHCI Host Controller
uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:1d.0: irq 16, io base 0x00002200
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1d.1[B] -> GSI 19 (level, low) -> IRQ 19
uhci_hcd 0000:00:1d.1: UHCI Host Controller
uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:1d.1: irq 19, io base 0x00002600
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
usb 1-1: new full speed USB device using uhci_hcd and address 2
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.01:USB HID core driver
mice: PS/2 mouse device common for all mice
md: raid0 personality registered as nr 2
md: raid1 personality registered as nr 3
md: raid5 personality registered as nr 4
raid5: automatically using best checksumming function: pIII_sse
   pIII_sse  :  1870.000 MB/sec
raid5: using function: pIII_sse (1870.000 MB/sec)
md: md driver 0.90.1 MAX_MD_DEVS=256, MD_SB_DISKS=27
device-mapper: 4.4.0-ioctl (2005-01-12) initialised: dm-devel@xxxxxxxxxx
NET: Registered protocol family 2
IP: routing cache hash table of 4096 buckets, 32Kbytes
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 6, 262144 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
NET: Registered protocol family 1
NET: Registered protocol family 17
usb 1-1.1: new full speed USB device using uhci_hcd and address 3
Bridge firewalling registered
Freeing unused kernel memory: 352k freed
usb 1-1.3: new full speed USB device using uhci_hcd and address 4
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.

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