Re: [Xen-ia64-devel] "Bad address" when "xm create"

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Hi Kevin.

On Thu, Apr 20, 2006 at 05:22:17PM +0800, Tian, Kevin wrote:
>       Only observed once that "Bad address" returned when "xm
> create" and thus failed to create domU on top of latest p2m tree. 
> However I can't reproduce it and just reported here for you 
> reference. Possibly the cause is from hypercall parameter copy, 
> but not sure. Next time if I see it, I'll try to capture more info.

Thank you for your report.
Is there any message in xend.log?

I found "bad address" from the xend.log of my test environtment.
I don't remember it clearly, but I guess this was caused by hypercall
parameter copy.
xc_linux_build() has work around, but xc_memory_op() doesn't 
so that xc_memory_op() might result in EFAULT.


xc_domain_memory_increase_reservation()
  => xc_memory_op(xc_handle, XENMEM_increase_reservation, &reservation);

[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:177) 
XendDomainInfo.create(['vm', ['name', 'dom0vp-domU'], ['memory', '128'], 
['vcpus', '1'], ['image', ['linux', ['kernel', 
'/home/yamahata/xen/hg/ia64/xen-config/dom0vp/domU/vmlinux-xenU'], ['ramdisk', 
'/boot/efi/efi/people/yamahata/cross3/initrd-2.6.12'], ['root', '/dev/sda6 
ro'], ['args', '4']]], ['device', ['vbd', ['uname', 'phy:sda6'], ['dev', 
'sda6'], ['mode', 'w']]], ['
device', ['vif', ['bridge', 'xenbr0']]]])
[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:283) 
parseConfig: config is ['vm', ['name', 'dom0vp-domU'], ['memory', '128'], 
['vcpus', '1'], ['image', ['linux', ['kernel', 
'/home/yamahata/xen/hg/ia64/xen-config/dom0vp/domU/vmlinux-xenU'], ['ramdisk', 
'/boot/efi/efi/people/yamah
ata/cross3/initrd-2.6.12'], ['root', '/dev/sda6 ro'], ['args', '4']]], 
['device', ['vbd', ['uname', 'phy:sda6'], ['dev', 'sda6'], ['mode', 'w']]], 
['device', ['vif', ['bridge', 'xenbr0']]]]
[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:379) 
parseConfig: result is {'ssidref': None, 'uuid': None, 'on_crash': None, 
'on_reboot': None, 'image': ['linux', ['kernel', 
'/home/yamahata/xen/hg/ia64/xen-config/dom0vp/domU/vmlinux-xenU'], ['ramdisk', 
'/boot/efi/efi/people/yama
hata/cross3/initrd-2.6.12'], ['root', '/dev/sda6 ro'], ['args', '4']], 
'on_poweroff': None, 'cpus': None, 'name': 'dom0vp-domU', 'backend': [], 
'vcpus': 1, 'cpu_weight': None, 'vcpu_avail': None, 'memory': 128, 'device': 
[('vbd', ['vbd', ['uname', 'phy:sda6'], ['dev', 'sda6'], ['mode', 'w']]), (
'vif', ['vif', ['bridge', 'xenbr0']])], 'bootloader': None, 'cpu': None, 
'maxmem': None}
[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1163) 
XendDomainInfo.construct: None 0
[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1195) 
XendDomainInfo.initDomain: 1 1.0
[2006-03-23 15:05:04 xend] DEBUG (balloon:126) Balloon: free 1777; need 129; 
done.
[2006-03-23 15:05:04 xend.XendDomainInfo] ERROR (XendDomainInfo:189) Domain 
construction failed
Traceback (most recent call last):
  File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 182, in create
    vm.initDomain()
  File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 1220, in initDomain
    xc.domain_memory_increase_reservation(self.domid, m, 0, 0)
error: (14, 'Bad address')
[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1321) 
XendDomainInfo.destroy: domid=1
[2006-03-23 15:05:04 xend.XendDomainInfo] DEBUG (XendDomainInfo:1329) 
XendDomainInfo.destroyDomain(1)
[2006-03-23 15:05:04 xend] ERROR (SrvBase:87) Request create failed.
Traceback (most recent call last):
  File "/usr/lib/python/xen/web/SrvBase.py", line 85, in perform
    return op_method(op, req)
  File "/usr/lib/python/xen/xend/server/SrvDomainDir.py", line 82, in op_create
    raise XendError("Error creating domain: " + str(ex))
XendError: Error creating domain: (14, 'Bad address')

-- 
yamahata

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