[Xen-devel] Kernel BUG at drivers/xen/core/smpboot.c:242

Hi.
I get kernel panic during boot Xen 4.0.1 along with CentOS 5.5 default Xen kernel (2.6.18.194.el5.xen)
I hooked up a serial connection and it is the output during the boot time:

\ \/ /___ _ __   | || | / _ \ / |
\ // _ \ '_ \ | || |_| | | || |
/ \ __/ | | | |__   _| |_| || |
/_/\_\___|_| |_|    |_|(_)___(_)_|

(XEN) Xen version 4.0.1 (mohammad@(none)) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) Tue Mar 8 12:00:47 IRST 2011
(XEN) Latest ChangeSet: unavailable
(XEN) Bootloader: GNU GRUB 0.97
(XEN) Command line: console=tty0 console=com1 com1=57600,8n1
(XEN) Video information:
(XEN) VGA is text mode 80x25, font 8x16
(XEN) VBE/DDC methods: V2; EDID transfer time: 1 seconds
(XEN) Disc information:
(XEN) Found 0 MBR signatures
(XEN) Found 1 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN) 0000000000000000 - 000000000009dc00 (usable)
(XEN) 000000000009dc00 - 00000000000a0000 (reserved)
(XEN) 00000000000e6000 - 0000000000100000 (reserved)
(XEN) 0000000000100000 - 00000000d7ea0000 (usable)
(XEN) 00000000d7ea0000 - 00000000d7eb6000 (ACPI data)
(XEN) 00000000d7eb6000 - 00000000d7ed0000 (ACPI NVS)
(XEN) 00000000d7ed0000 - 00000000d7ee0000 (reserved)
(XEN) 00000000d7eed000 - 00000000d8000000 (reserved)
(XEN) 00000000e0000000 - 00000000f0000000 (reserved)
(XEN) 00000000ffc00000 - 0000000100000000 (reserved)
(XEN) 0000000100000000 - 0000001028000000 (usable)
(XEN) ACPI: RSDP 000F96E0, 0024 (r2 ACPIAM)
(XEN) ACPI: XSDT D7EA0100, 0064 (r1 082710 XSDT1832 20100827 MSFT       97)
(XEN) ACPI: FACP D7EA0290, 00F4 (r4 082710 FACP1832 20100827 MSFT       97)
(XEN) ACPI Warning (tbfadt-0444): Optional field "Pm2ControlBlock" has zero address or length: 0000000000000000/1 [20070126]
(XEN) ACPI: DSDT D7EA06D0, 52A6 (r2 0AAAA 0AAAA000        0 INTL 20051117)
(XEN) ACPI: FACS D7EB6000, 0040
(XEN) ACPI: APIC D7EA0390, 02F8 (r2 082710 APIC1832 20100827 MSFT       97)
(XEN) ACPI: MCFG D7EA0690, 003C (r1 082710 OEMMCFG 20100827 MSFT       97)
(XEN) ACPI: OEMB D7EB6040, 0082 (r1 082710 OEMB1832 20100827 MSFT       97)
(XEN) ACPI: HPET D7EAA6D0, 0038 (r1 082710 OEMHPET 20100827 MSFT       97)
(XEN) ACPI: SRAT D7EAA710, 04C0 (r2 AMD    F10             1 AMD         1)
(XEN) ACPI: SLIT D7EAABD0, 006C (r1 AMD    F10             1 AMD         1)
(XEN) ACPI: SSDT D7EAAC40, 78B4 (r1 A M I POWERNOW        1 AMD         1)
(XEN) System RAM: 65534MB (67107060kB)
(XEN) Reserving non-aligned node boundary @ mfn 0xe28000
(XEN) Domain heap initialised DMA width 31 bits
(XEN) Processor #16 0:9 APIC version 16
(XEN) Processor #17 0:9 APIC version 16
(XEN) Processor #18 0:9 APIC version 16
(XEN) Processor #19 0:9 APIC version 16
(XEN) Processor #20 0:9 APIC version 16
(XEN) Processor #21 0:9 APIC version 16
(XEN) Processor #22 0:9 APIC version 16
(XEN) Processor #23 0:9 APIC version 16
(XEN) Processor #24 0:9 APIC version 16
(XEN) Processor #25 0:9 APIC version 16
(XEN) Processor #26 0:9 APIC version 16
(XEN) Processor #27 0:9 APIC version 16
(XEN) Processor #32 0:9 APIC version 16
(XEN) Processor #33 0:9 APIC version 16
(XEN) Processor #34 0:9 APIC version 16
(XEN) Processor #35 0:9 APIC version 16
(XEN) Processor #36 0:9 APIC version 16
(XEN) Processor #37 0:9 APIC version 16
(XEN) Processor #38 0:9 APIC version 16
(XEN) Processor #39 0:9 APIC version 16
(XEN) Processor #40 0:9 APIC version 16
(XEN) Processor #41 0:9 APIC version 16
(XEN) Processor #42 0:9 APIC version 16
(XEN) Processor #43 0:9 APIC version 16
(XEN) Processor #48 0:9 APIC version 16
(XEN) Processor #49 0:9 APIC version 16
(XEN) Processor #50 0:9 APIC version 16
(XEN) Processor #51 0:9 APIC version 16
(XEN) Processor #52 0:9 APIC version 16
(XEN) Processor #53 0:9 APIC version 16
(XEN) Processor #54 0:9 APIC version 16
(XEN) Processor #55 0:9 APIC version 16
(XEN) Processor #56 0:9 APIC version 16
(XEN) Processor #57 0:9 APIC version 16
(XEN) Processor #58 0:9 APIC version 16
(XEN) Processor #59 0:9 APIC version 16
(XEN) Processor #64 0:9 APIC version 16
(XEN) Processor #65 0:9 APIC version 16
(XEN) Processor #66 0:9 APIC version 16
(XEN) Processor #67 0:9 APIC version 16
(XEN) Processor #68 0:9 APIC version 16
(XEN) Processor #69 0:9 APIC version 16
(XEN) Processor #70 0:9 APIC version 16
(XEN) Processor #71 0:9 APIC version 16
(XEN) Processor #72 0:9 APIC version 16
(XEN) Processor #73 0:9 APIC version 16
(XEN) Processor #74 0:9 APIC version 16
(XEN) Processor #75 0:9 APIC version 16
(XEN) IOAPIC[0]: apic_id 0, version 33, address 0xfec00000, GSI 0-23
(XEN) IOAPIC[1]: apic_id 1, version 33, address 0xfec20000, GSI 24-55
(XEN) Enabling APIC mode: Phys. Using 2 I/O APICs
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2200.066 MHz processor.
(XEN) Initing memory sharing.
(XEN) HVM: ASIDs enabled.
(XEN) HVM: SVM enabled
(XEN) HVM: Hardware Assisted Paging detected.
(XEN) AMD-Vi: IOMMU not found!
(XEN) I/O virtualisation disabled
(XEN) Total of 48 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN) -> Using new ACK method
(XEN) TSC is reliable, synchronization unnecessary
(XEN) Platform timer is 14.318MHz HPET
�(XEN) Allocated console ring of 128 KiB.
(XEN) do_IRQ: 1.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 2.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 3.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 4.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 5.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 6.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 7.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 8.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 9.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 10.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 11.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 12.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 13.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 14.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 15.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 16.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 17.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 18.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 19.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 20.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 21.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 22.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 23.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 24.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 25.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 26.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 27.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 28.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 29.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 30.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 31.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 32.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 33.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 34.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 35.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 36.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 37.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 38.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 39.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 40.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 41.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 42.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 43.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 44.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 45.231 No irq handler for vector (irq -1)
(XEN) do_IRQ: 46.231 No irq handler for vector (irq -1)
(XEN) Brought up 48 CPUs
(XEN) do_IRQ: 47.231 No irq handler for vector (irq -1)
(XEN) *** LOADING DOMAIN 0 ***
(XEN) Xen kernel: 64-bit, lsb, compat32
(XEN) Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80200000 -> 0xffffffff8075decc
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN) Dom0 alloc.:   0000000210000000->0000000220000000 (16494980 pages to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN) Loaded kernel: ffffffff80200000->ffffffff8075decc
(XEN) Init. ramdisk: ffffffff8075e000->ffffffff80e3a800
(XEN) Phys-Mach map: ffffffff80e3b000->ffffffff88c93c20
(XEN) Start info:    ffffffff88c94000->ffffffff88c944b4
(XEN) Page tables:   ffffffff88c95000->ffffffff88ce0000
(XEN) Boot stack:    ffffffff88ce0000->ffffffff88ce1000
(XEN) TOTAL:         ffffffff80000000->ffffffff89000000
(XEN) ENTRY ADDRESS: ffffffff80200000
(XEN) Dom0 has maximum 48 VCPUs
(XEN) Scrubbing Free RAM: .done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)
(XEN) Freed 168kB init memory.
kernel direct mapping tables up to fcb984000 @ 8d1e000-18a5a000
Bootdata ok (command line is ro root=LABEL=/ rhgb xencons=ttyS0 console=ttyS0)
Linux version 2.6.18-194.el5.customxen (mohammad@xxxxxxxxxxxxxxxxxx) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Mar 8 13:09:26 IRST 2011
BIOS-provided physical RAM map:
Xen: 0000000000000000 - 0000000fcb984000 (usable)
DMI present.
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x10] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x11] enabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x12] enabled)
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x13] enabled)
ACPI: LAPIC (acpi_id[0x05] lapic_id[0x14] enabled)
ACPI: LAPIC (acpi_id[0x06] lapic_id[0x15] enabled)
ACPI: LAPIC (acpi_id[0x07] lapic_id[0x16] enabled)
ACPI: LAPIC (acpi_id[0x08] lapic_id[0x17] enabled)
ACPI: LAPIC (acpi_id[0x09] lapic_id[0x18] enabled)
ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x19] enabled)
ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x1a] enabled)
ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x1b] enabled)
ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x20] enabled)
ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x21] enabled)
ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x22] enabled)
ACPI: LAPIC (acpi_id[0x10] lapic_id[0x23] enabled)
ACPI: LAPIC (acpi_id[0x11] lapic_id[0x24] enabled)
ACPI: LAPIC (acpi_id[0x12] lapic_id[0x25] enabled)
ACPI: LAPIC (acpi_id[0x13] lapic_id[0x26] enabled)
ACPI: LAPIC (acpi_id[0x14] lapic_id[0x27] enabled)
ACPI: LAPIC (acpi_id[0x15] lapic_id[0x28] enabled)
ACPI: LAPIC (acpi_id[0x16] lapic_id[0x29] enabled)
ACPI: LAPIC (acpi_id[0x17] lapic_id[0x2a] enabled)
ACPI: LAPIC (acpi_id[0x18] lapic_id[0x2b] enabled)
ACPI: LAPIC (acpi_id[0x19] lapic_id[0x30] enabled)
ACPI: LAPIC (acpi_id[0x1a] lapic_id[0x31] enabled)
ACPI: LAPIC (acpi_id[0x1b] lapic_id[0x32] enabled)
ACPI: LAPIC (acpi_id[0x1c] lapic_id[0x33] enabled)
ACPI: LAPIC (acpi_id[0x1d] lapic_id[0x34] enabled)
ACPI: LAPIC (acpi_id[0x1e] lapic_id[0x35] enabled)
ACPI: LAPIC (acpi_id[0x1f] lapic_id[0x36] enabled)
ACPI: LAPIC (acpi_id[0x20] lapic_id[0x37] enabled)
ACPI: LAPIC (acpi_id[0x21] lapic_id[0x38] enabled)
ACPI: LAPIC (acpi_id[0x22] lapic_id[0x39] enabled)
ACPI: LAPIC (acpi_id[0x23] lapic_id[0x3a] enabled)
ACPI: LAPIC (acpi_id[0x24] lapic_id[0x3b] enabled)
ACPI: LAPIC (acpi_id[0x25] lapic_id[0x40] enabled)
ACPI: LAPIC (acpi_id[0x26] lapic_id[0x41] enabled)
ACPI: LAPIC (acpi_id[0x27] lapic_id[0x42] enabled)
ACPI: LAPIC (acpi_id[0x28] lapic_id[0x43] enabled)
ACPI: LAPIC (acpi_id[0x29] lapic_id[0x44] enabled)
ACPI: LAPIC (acpi_id[0x2a] lapic_id[0x45] enabled)
ACPI: LAPIC (acpi_id[0x2b] lapic_id[0x46] enabled)
ACPI: LAPIC (acpi_id[0x2c] lapic_id[0x47] enabled)
ACPI: LAPIC (acpi_id[0x2d] lapic_id[0x48] enabled)
ACPI: LAPIC (acpi_id[0x2e] lapic_id[0x49] enabled)
ACPI: LAPIC (acpi_id[0x2f] lapic_id[0x4a] enabled)
ACPI: LAPIC (acpi_id[0x30] lapic_id[0x4b] enabled)
ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x04] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x05] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x06] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x07] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x08] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x09] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x0a] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x0b] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x0c] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x0d] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x0e] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x0f] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x10] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x11] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x12] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x13] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x14] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x15] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x16] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x17] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x18] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x19] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x1a] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x1b] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x1c] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x1d] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x1e] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x1f] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x20] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x21] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x22] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x23] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x24] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x25] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x26] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x27] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x28] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x29] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x2a] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x2b] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x2c] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x2d] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x2e] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x2f] high edge lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x30] high edge lint[0x1])
ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 0, version 33, address 0xfec00000, GSI 0-23
ACPI: IOAPIC (id[0x01] address[0xfec20000] gsi_base[24])
IOAPIC[1]: apic_id 1, version 33, address 0xfec20000, GSI 24-55
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
Setting APIC routing to xen
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at f1000000 (gap: f0000000:ec00000)
Built 1 zonelists. Total pages: 16562564
Kernel command line: ro root=LABEL=/ rhgb xencons=ttyS0 console=ttyS0
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 32768 bytes)
Xen reported: 2200.066 MHz processor.
Console: colour VGA+ 80x25
Dentry cache hash table entries: 8388608 (order: 14, 67108864 bytes)
Inode-cache hash table entries: 4194304 (order: 13, 33554432 bytes)
Software IO TLB enabled:
Aperture:     64 megabytes
Kernel range: 0xffff8800500bf000 - 0xffff8800540bf000
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
Memory: 64897092k/66250256k available (2512k kernel code, 1344284k reserved, 1396k data, 184k init)
Calibrating delay using timer specific routine.. 5501.64 BogoMIPS (lpj=11003297)
Security Framework v1.0.0 initialized
SELinux: Initializing.
selinux_register_security: Registering secondary module capability
Capability LSM initialized as secondary
Mount-cache hash table entries: 256
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
(SMP-)alternatives turned off
ACPI: Core revision 20060707
Initializing CPU#1
Initializing CPU#2
Initializing CPU#3
Initializing CPU#4
Initializing CPU#5
Initializing CPU#6
Initializing CPU#7
Initializing CPU#8
Initializing CPU#9
Initializing CPU#10
Initializing CPU#11
Initializing CPU#12
Initializing CPU#13
Initializing CPU#14
Initializing CPU#15
Initializing CPU#16
Initializing CPU#17
Initializing CPU#18
Initializing CPU#19
Initializing CPU#20
Initializing CPU#21
Initializing CPU#22
Initializing CPU#23
Initializing CPU#24
Initializing CPU#25
Initializing CPU#26
Initializing CPU#27
Initializing CPU#28
Initializing CPU#29
Initializing CPU#30
Initializing CPU#31
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at drivers/xen/core/smpboot.c:242
invalid opcode: 0000 [1] SMP
last sysfs file:
CPU 0
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.18-194.el5.customxen #1
RIP: e030:[<ffffffff803b61ad>] [<ffffffff803b61ad>] __cpu_up+0x269/0x377
RSP: e02b:ffff880010d09e20 EFLAGS: 00010282
RAX: ffffffffffffffea RBX: 0000000000000140 RCX: ffffffff804f67c0
RDX: ffff880000e4c000 RSI: 0000000000000020 RDI: 0000000000000000
RBP: ffff880000e4c000 R08: 00000000ffffffff R09: 0000000000000000
R10: ffff880000e4c000 R11: 0000000000000200 R12: ffffffff804f3f40
R13: 0000000000000020 R14: ffff88005417d7a0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffffffff805d2000(0000) knlGS:0000000000000000
CS: e033 DS: 0000 ES: 0000
Process swapper (pid: 1, threadinfo ffff880010d08000, task ffff880010d0b7a0)
Stack: 0000000100000000 0000000000000000 0000000000000000 0000000000000000
0000000000000020 0000000000000020 0000000000000020 ffffffff802903b1
0000000000000063 0000000000000000
Call Trace:
[<ffffffff802903b1>] cpu_callback+0xdd/0x177
[<ffffffff802a0c34>] cpu_up+0xc7/0x12c
[<ffffffff8064c6a7>] init+0xb5/0x2fe
[<ffffffff80260b2c>] child_rip+0xa/0x12
[<ffffffff8036dc2c>] acpi_ds_init_one_object+0x0/0x80
[<ffffffff8064c5f2>] init+0x0/0x2fe
[<ffffffff80260b22>] child_rip+0x0/0x12

Code: 0f 0b 68 f8 60 4b 80 c2 f2 00 48 89 ef e8 79 58 e5 ff be ff
RIP [<ffffffff803b61ad>] __cpu_up+0x269/0x377
RSP <ffff880010d09e20>
<0>Kernel panic - not syncing: Fatal exception
(XEN) Domain 0 crashed: rebooting machine in 5 seconds.

Why there is a kernel bug at drivers/xen/core/smpboot.c:242?!!
I am using a Tyan server which has 48 AMD cores and 64GB RAM.

Has anybody got an idea about this bug?!

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[Xen-devel] Kernel BUG at drivers/xen/core/smpboot.c:242