Xen users - Oct 2011 - "reset requested in cpu_handle_ioreq" causes the wirtual machine crashed when using "xm create xp.hvm"

the contexts are as follows, looking forward to your reply, thanks
 [1]enviromention : xen3.4.2+CentOS-5.5  
 [2]config file: xp.hvm, as follows
 _s_name = 'xp-101'
_s_vnc_display = 5310
_s_vm_id = 101
_s_vm_mac = '00:16:3e:eb:ca:65'
_s_memory = 512
_s_allow_destroy = False
_s_use_vnc = True
#  -*- mode: python; -*-
 #----------------------------------------------------------------------------
# Kernel image file.
kernel = "/usr/lib/xen/boot/hvmloader"
#vcpus = 1
#cpus = '1-3'
builder = 'hvm'
memory = _s_memory
pae = 0
acpi = 1
apic = 1
vif = [ 'type=ioemu, bridge=virbr0, mac=' + _s_vm_mac ]
device_model = '/usr/lib64/xen/bin/qemu-dm'
 boot = "c"
 sdl = 0
 vnc = 1
vncunused = 0
vnclisten = '0.0.0.0'
vncpasswd = '***'
 serial = 'pty'
 usb = 1
usbdevice = 'tablet'
name = _s_name
disk = [ 'tap:qcow2:/home/bruce/vm-check.img,hda,w!' ]
vncdisplay = _s_vnc_display
  
 [3]qemu-dm log i:
 domid: 5310
qemu: the number of cpus is 1
config qemu network with xen bridge for  tap5310.0 virbr0
Strip off blktap sub-type prefix to /home/malei/vm-check.img (drv
'qcow2')
Watching /local/domain/0/device-model/5310/logdirty/next-active
Watching /local/domain/0/device-model/5310/command
char device redirected to /dev/pts/1
qemu_map_cache_init nr_buckets = 10000 size 4194304
shared page at pfn feffd
buffered io page at pfn feffb
Guest uuid = ca149409-ede5-37eb-c5b2-eede7c4ed6ed
Time offset set 0
populating video RAM at ff000000
mapping video RAM from ff000000
Register xen platform.
Done register platform.
xs_read(/vm/ca149409-ede5-37eb-c5b2-eede7c4ed6ed/log-throttling): read error
platform_fixed_ioport: changed ro/rw state of ROM memory area. now is rw state.
xs_read(/local/domain/0/device-model/5310/xen_extended_power_mgmt): read error
I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
cirrus vga map change while on lfb mode
mapping vram to f0000000 - f0400000
platform_fixed_ioport: changed ro/rw state of ROM memory area. now is rw state.
platform_fixed_ioport: changed ro/rw state of ROM memory area. now is ro state.
reset requested in cpu_handle_ioreq.
Issued domain 5310 reboot
  
 [4]xend.log
 [2011-10-28 11:59:17 24059] DEBUG (XendDomainInfo:93)
XendDomainInfo.create(['vm', ['name', 'xp-101'],
['memory', 512], ['vcpus', 1], ['on_xend_start',
'ignore'], ['on_xend_st\
op', 'ignore'], ['image', ['hvm', ['kernel',
'/usr/lib/xen/boot/hvmloader'], ['videoram', 4],
['device_model', '/usr/lib64/xen/bin/qemu-dm'], ['pae',
0], ['vcpus', 1], ['boot'\
, 'c'], ['fda', ''], ['fdb', ''],
['timer_mode', 1], ['localtime', 0], ['serial',
'pty'], ['stdvga', 0], ['isa', 0], ['nographic',
0], ['soundhw', ''], ['vnc', 1], ['vncdispla\
y', 5310], ['vncunused', 0], ['vnclisten',
'0.0.0.0'], ['sdl', 0], ['xauthority',
'/home/malei/.Xauthority'], ['rtc_timeoffset', 0],
['monitor', 0], ['acpi', 1], ['apic', 1], \
['usb', 1], ['usbdevice', 'tablet'], ['keymap',
''], ['pci', []], ['hpet', 0], ['guest_os_type',
'default'], ['hap', 1], ['cpuid', []],
['cpuid_check', []], ['viridian', 0], [\
'pci_msitranslate', 1], ['vpt_align', 1],
['pci_power_mgmt', 0], ['xen_platform_pci', 1],
['vncpasswd', 'XXXXXXXX']]], ['s3_integrity', 1],
['device', ['tap', ['uname', 'tap:q\
cow2:/home/malei/vm-check.img'], ['dev', 'hda'],
['mode', 'w!']]], ['device', ['vif',
['bridge', 'virbr0'], ['mac',
'00:16:3e:eb:ca:65'], ['type', 'ioemu']]]])
[2011-10-28 11:59:17 24059] DEBUG (XendDomainInfo:2312)
XendDomainInfo.constructDomain
[2011-10-28 11:59:17 24059] DEBUG (balloon:166) Balloon: 1074196 KiB free; need
4096; done.
[2011-10-28 11:59:17 24059] DEBUG (XendDomainInfo:2350) @cs:
XendDomainInfo.constructDomain vncdisplay=(5310)
[2011-10-28 11:59:17 24059] DEBUG (XendDomain:454) Adding Domain: 5310
[2011-10-28 11:59:17 24059] DEBUG (XendDomain:455) @chenshi : add domain - wait
5 seconds !
[2011-10-28 11:59:22 24059] DEBUG (XendDomainInfo:2522)
XendDomainInfo.initDomain: 5310 256
[2011-10-28 11:59:22 24059] DEBUG (image:320) Stored a VNC password for vfb
access
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: boot, val: c
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: fda, val: None
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: fdb, val: None
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: soundhw, val: None
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: localtime, val: 0
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: serial, val: ['pty']
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: std-vga, val: 0
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: isa, val: 0
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: acpi, val: 1
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: usb, val: 1
[2011-10-28 11:59:22 24059] DEBUG (image:813) args: usbdevice, val: tablet
[2011-10-28 11:59:22 24059] INFO (image:749) Need to create platform
device.[domid:5310]
[2011-10-28 11:59:22 24059] DEBUG (XendDomainInfo:2546)
_initDomain:shadow_memory=0x0, memory_static_max=0x20000000,
memory_static_min=0x0.
[2011-10-28 11:59:22 24059] DEBUG (balloon:166) Balloon: 1072784 KiB free; need
535552; done.
[2011-10-28 11:59:22 24059] INFO (image:173) buildDomain os=hvm dom=5310 vcpus=1
[2011-10-28 11:59:22 24059] DEBUG (image:866) domid          = 5310
[2011-10-28 11:59:22 24059] DEBUG (image:867) image          =
/usr/lib/xen/boot/hvmloader
[2011-10-28 11:59:22 24059] DEBUG (image:868) store_evtchn   = 2
 [2011-10-28 11:59:22 24059] DEBUG (image:869) memsize        = 512
[2011-10-28 11:59:22 24059] DEBUG (image:870) target         = 512
[2011-10-28 11:59:22 24059] DEBUG (image:871) vcpus          = 1
[2011-10-28 11:59:22 24059] DEBUG (image:872) acpi           = 1
[2011-10-28 11:59:22 24059] DEBUG (image:873) apic           = 1
[2011-10-28 11:59:22 24059] INFO (XendDomainInfo:2173) createDevice: vfb :
{'vncunused': 0, 'other_config': {'vncunused': 0,
'vncpasswd': 'XXXXXXXX', 'vnclisten': '0.0.0.0',
'\
vnc': '1', 'vncdisplay': 5310}, 'vnc': '1',
'uuid': 'd1a4e36a-9fac-dfd8-3518-9782502c18c9',
'vnclisten': '0.0.0.0', 'vncdisplay': 5310,
'vncpasswd': 'XXXXXXXX'}
[2011-10-28 11:59:22 24059] DEBUG (DevController:95) DevController: writing
{'state': '1', 'backend-id': '0',
'backend': '/local/domain/0/backend/vfb/5310/0'} to
/local/domain\
/5310/device/vfb/0.
[2011-10-28 11:59:22 24059] DEBUG (DevController:97) DevController: writing
{'vncunused': '0', 'domain': 'xp-101',
'vnc': '1', 'uuid':
'd1a4e36a-9fac-dfd8-3518-9782502c18c9', \
'frontend-id': '5310', 'vnclisten': '0.0.0.0',
'vncdisplay': '5310', 'vncpasswd': 'XXXXXXXX',
'state': '1', 'online': '1', 'frontend':
'/local/domain/5310/device/vfb/0'} to /l\
ocal/domain/0/backend/vfb/5310/0.
[2011-10-28 11:59:22 24059] INFO (XendDomainInfo:2173) createDevice: tap :
{'bootable': 1, 'uname':
'tap:qcow2:/home/malei/vm-check.img', 'mode': 'w!',
'dev': 'hda', 'uuid': '\
427b6daf-6cb3-c1aa-9cc5-746b85d53550'}
[2011-10-28 11:59:22 24059] DEBUG (DevController:95) DevController: writing
{'backend-id': '0', 'virtual-device': '768',
'device-type': 'disk', 'state': '1',
'backend': '/loca\
l/domain/0/backend/tap/5310/768'} to /local/domain/5310/device/vbd/768.
[2011-10-28 11:59:22 24059] DEBUG (DevController:97) DevController: writing
{'domain': 'xp-101', 'frontend':
'/local/domain/5310/device/vbd/768', 'uuid':
'427b6daf-6cb3-c1aa-9\
cc5-746b85d53550', 'bootable': '1', 'dev':
'hda', 'state': '1', 'params':
'qcow2:/home/malei/vm-check.img', 'mode': 'w!',
'online': '1', 'frontend-id': '5310',
'type': 'tap'} \
to /local/domain/0/backend/tap/5310/768.
[2011-10-28 11:59:22 24059] INFO (XendDomainInfo:2173) createDevice: vif :
{'bridge': 'virbr0', 'mac': '00:16:3e:eb:ca:65',
'type': 'ioemu', 'uuid': 'b359fd65-6f9a-e327-726a-7\
b640e9622d2'}
[2011-10-28 11:59:22 24059] DEBUG (DevController:95) DevController: writing
{'state': '1', 'backend-id': '0',
'backend': '/local/domain/0/backend/vif/5310/0'} to
/local/domain\
/5310/device/vif/0.
[2011-10-28 11:59:22 24059] DEBUG (DevController:97) DevController: writing
{'bridge': 'virbr0', 'domain': 'xp-101',
'handle': '0', 'uuid':
'b359fd65-6f9a-e327-726a-7b640e9622\
d2', 'script': '/etc/xen/scripts/vif-bridge', 'mac':
'00:16:3e:eb:ca:65', 'frontend-id': '5310',
'state': '1', 'online': '1', 'frontend':
'/local/domain/5310/device/vif/0', 't\
ype': 'ioemu'} to /local/domain/0/backend/vif/5310/0.
[2011-10-28 11:59:22 24059] INFO (image:394) spawning device models:
/usr/lib64/xen/bin/qemu-dm ['/usr/lib64/xen/bin/qemu-dm', '-d',
'5310', '-domain-name', 'xp-101', '-videor\
am', '4', '-vnc', '0.0.0.0:5310,password',
'-vcpus', '1', '-boot', 'c', '-serial',
'pty', '-acpi', '-usb', '-usbdevice',
'tablet', '-net', 'nic,vlan=1,macaddr=00:16:3e:eb:ca:6\
5,model=rtl8139', '-net',
'tap,vlan=1,ifname=tap5310.0,bridge=virbr0', '-M',
'xenfv']
[2011-10-28 11:59:22 24059] INFO (image:443) device model pid: 11741
[2011-10-28 11:59:22 24059] DEBUG (XendDomainInfo:3077) Storing VM details:
{'on_xend_stop': 'ignore', 'shadow_memory': '5',
'uuid': 'ca149409-ede5-37eb-c5b2-eede7c4ed6ed', 'o\
n_reboot': 'restart', 'start_time': '1319774362.52',
'on_poweroff': 'destroy', 'bootloader_args': '',
'on_xend_start': 'ignore', 'on_crash':
'restart', 'xend/restart_count': '\
0', 'vcpus': '1', 'vcpu_avail': '1',
'bootloader': '', 'image': '(hvm (kernel ) (videoram
4) (hpet 0) (stdvga 0) (vnclisten 0.0.0.0) (loader /usr/lib/xen/boot/hvmloader)
(seri\
al pty) (vncunused 0) (xen_platform_pci 1) (boot c) (rtc_timeoffset 0)
(vncpasswd XXXXXX) (pci ()) (pae 0) (vpt_align 1) (hap 1) (viridian 0) (acpi 1)
(localtime 0) (timer_mod\
e 1) (vnc 1) (nographic 0) (guest_os_type default) (vncdisplay 5310)
(pci_msitranslate 1) (apic 1) (sdl 0) (monitor 0) (usbdevice tablet)
(device_model /usr/lib64/xen/bin/qemu\
-dm) (pci_power_mgmt 0) (usb 1) (xauthority /home/malei/.Xauthority) (isa 0)
(notes (SUSPEND_CANCEL 1)))', 'name': 'xp-101'}
[2011-10-28 11:59:22 24059] INFO (image:531) waiting for sentinel_fifo
 [2011-10-28 11:59:22 24059] DEBUG (XendDomainInfo:1626) Storing domain details:
{'console/port': '3', 'name': 'xp-101',
'console/limit': '1048576', 'store/port': '2',
'vm': '/\
vm/ca149409-ede5-37eb-c5b2-eede7c4ed6ed', 'domid': '5310',
'image/suspend-cancel': '1', 'cpu/0/availability':
'online', 'memory/target': '524288',
'control/platform-feature-mu\
ltiprocessor-suspend': '1', 'store/ring-ref':
'1044476', 'console/type': 'ioemu'}
[2011-10-28 11:59:22 24059] DEBUG (DevController:95) DevController: writing
{'state': '1', 'backend-id': '0',
'backend': '/local/domain/0/backend/console/5310/0'} to
/local/do\
main/5310/device/console/0.
[2011-10-28 11:59:22 24059] DEBUG (DevController:97) DevController: writing
{'domain': 'xp-101', 'frontend':
'/local/domain/5310/device/console/0', 'uuid':
'7a40d1f8-cbd4-7ff0\
-d0e2-995044a0414b', 'frontend-id': '5310', 'state':
'1', 'location': '3', 'online': '1',
'protocol': 'vt100'} to /local/domain/0/backend/console/5310/0.
[2011-10-28 11:59:22 24059] DEBUG (XendDomainInfo:1713)
XendDomainInfo.handleShutdownWatch
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices vif.
[2011-10-28 11:59:22 24059] DEBUG (DevController:144) Waiting for 0.
[2011-10-28 11:59:22 24059] DEBUG (DevController:629) hotplugStatusCallback
/local/domain/0/backend/vif/5310/0/hotplug-status.
[2011-10-28 11:59:22 24059] DEBUG (DevController:629) hotplugStatusCallback
/local/domain/0/backend/vif/5310/0/hotplug-status.
[2011-10-28 11:59:22 24059] DEBUG (DevController:643) hotplugStatusCallback 1.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices vscsi.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices vbd.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices irq.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices vkbd.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices vfb.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices
console.
 [2011-10-28 11:59:22 24059] DEBUG (DevController:144) Waiting for 0.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices pci.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices
ioports.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices tap.
[2011-10-28 11:59:22 24059] DEBUG (DevController:144) Waiting for 768.
[2011-10-28 11:59:22 24059] DEBUG (DevController:629) hotplugStatusCallback
/local/domain/0/backend/tap/5310/768/hotplug-status.
[2011-10-28 11:59:22 24059] DEBUG (DevController:643) hotplugStatusCallback 1.
[2011-10-28 11:59:22 24059] DEBUG (DevController:139) Waiting for devices vtpm.
[2011-10-28 11:59:22 24059] INFO (XendDomain:1185) Domain xp-101 (5310)
unpaused.
[2011-10-28 11:59:47 24059] INFO (XendDomainInfo:1907) Domain has shutdown:
name=xp-101 id=5310 reason=reboot.
[2011-10-28 11:59:47 24059] ERROR (XendDomainInfo:2024) VM xp-101 restarting too
fast (Elapsed time: 24.971154 seconds). Refusing to restart to avoid loops.
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2749) XendDomainInfo.destroy:
domid=5310
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2212) Destroying device model
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2219) Releasing devices
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2232) Removing vif/0
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:1138)
XendDomainInfo.destroyDevice: deviceClass = vif, device = vif/0
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2232) Removing vbd/768
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:1138)
XendDomainInfo.destroyDevice: deviceClass = tap, device = vbd/768
 [2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2232) Removing vfb/0
[2011-10-28 11:59:47 24059] INFO (image:556) xp-101 device model terminated
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:1138)
XendDomainInfo.destroyDevice: deviceClass = vfb, device = vfb/0
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2232) Removing console/0
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:1138)
XendDomainInfo.destroyDevice: deviceClass = console, device = console/0
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2217) No device model
[2011-10-28 11:59:47 24059] DEBUG (XendDomainInfo:2219) Releasing devices

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