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Сергей Лукашевич

2007-Jun-25 14:26 UTC

[Xen-users] xen 3.1 - domU hangs just after "xm create"

What are methods to debug domU when it hangs? Using xen 3.1 compiled from
sources I could not manage to launch no domU. Fot instance, I run something like
this:



=====8<====================
disk = [ ''file:/oradata-act/sles.disk,hda1,w'',
'',hdc:cdrom,r'' ]

kernel = "/boot/vmlinuz-2.6.18-xen"

ramdisk = "/boot/initrd-2.6.18-xen"

cpus = "1"

vcpus = 2

memory = 256

name = "sles"

root="/dev/hda1 ro"

=====8<====================


Of course, sles.disk is a reiserfs image containing unTARred SLES9.3 64bit OS.



The domain console outputs nothing but several spaces at the very start and the
domU hangs in a few (15-25) seconds.



What are log files to analyze? What are ''debug'' options?



I managed to run dom0  which is behaving not so bad. 

Only several ''segfault''s in dmesg confuse me.



I use SUN X4600 server which is of 64bits, 32gigs and 16 virtual CPUs.






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Petersson, Mats

2007-Jun-25 14:34 UTC

head link

RE: [Xen-users] xen 3.1 - domU hangs just after "xm create"

> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com 
> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> ?????? ?????????
> Sent: 25 June 2007 15:26
> To: xen-users@lists.xensource.com
> Subject: [Xen-users] xen 3.1 - domU hangs just after "xm create"
> 
> What are methods to debug domU when it hangs? Using xen 3.1 
> compiled from sources I could not manage to launch no domU. 
> Fot instance, I run something like this:
> 
> 
> 
> =====8<====================> 
> disk = [ ''file:/oradata-act/sles.disk,hda1,w'',
'',hdc:cdrom,r'' ]
> 
> kernel = "/boot/vmlinuz-2.6.18-xen"
> 
> ramdisk = "/boot/initrd-2.6.18-xen"
I take it this is the same initrd you use for Dom0? Does it have the drivers for
DomU too?

You may want to mount the sles.disk and use "mkinitrd" to create a new
ramdisk from inside the sles.disk instead - that has uses the fstab of the
sles.disk, etc. > 
> cpus = "1"
> 
> vcpus = 2
> 
> memory = 256
> 
> name = "sles"
> 
> root="/dev/hda1 ro"
> 
> =====8<====================> 
> 
> 
> Of course, sles.disk is a reiserfs image containing unTARred 
> SLES9.3 64bit OS.
I hope you don''t use reiserfs on reiserfs here - as if you do and you
ever need to "fsck" the underlaying disk, then you''ll get
problems - reiserfs uses a "magic word" to indicate where it starts
it''s filesystem, and finding another (same) magic word in the middle of
the file-system is most certainly going to make things very confused when trying
to figure out what''s what.
> 
> 
> 
> The domain console outputs nothing but several spaces at the 
> very start and the domU hangs in a few (15-25) seconds.
"Interesting". Not sure what that could be. 
> 
> 
> 
> What are log files to analyze? What are ''debug'' options?
I''d start with "xm dmesg". If that''s not saying
anything useful, look at /var/log/xen/xend.log and .../xend-debug.log

These may also not contain anything useful - but it would be where I''d
start trying to figure out what''s wrong. > 
> 
> 
> I managed to run dom0  which is behaving not so bad. 
> 
> Only several ''segfault''s in dmesg confuse me.
Where are those segfualts from?> 
> 
> 
> I use SUN X4600 server which is of 64bits, 32gigs and 16 virtual CPUs.
I expect this to be capable of running Xen for sure. 

--
Mats



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Сергей Лукашевич

2007-Jun-25 15:30 UTC

head link

Re: [Xen-users] xen 3.1 - domU hangs just after "xm create"

25.06.07, 18:34, Petersson, Mats <Mats.Petersson@amd.com> <>:


>  
> > -----Original Message-----
> > From: xen-users-bounces@lists.xensource.com 
> > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> > ?????? ?????????
> > Sent: 25 June 2007 15:26
> > To: xen-users@lists.xensource.com
> > Subject: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> > 
> > What are methods to debug domU when it hangs? Using xen 3.1 
> > compiled from sources I could not manage to launch no domU. 
> > Fot instance, I run something like this:
> > 
> > 
> > 
> > =====8<====================
> > 
> > disk = [ ''file:/oradata-act/sles.disk,hda1,w'',
'',hdc:cdrom,r'' ]
> > 
> > kernel = "/boot/vmlinuz-2.6.18-xen"
> > 
> > ramdisk = "/boot/initrd-2.6.18-xen"
> I take it this is the same initrd you use for Dom0? Does it have the
drivers for DomU too?


Yes, the same kernel and the same initrd. I beleive XEN allows using same here
from some of 2.* versions, is not it? Initrd contains reiserfs driver -
that''s quite enough to start booting. I suspect something wrong with my
compiling and installing XEN because domUs output NO lines to their consoles to
suspect its kernel.


> You may want to mount the sles.disk and use "mkinitrd" to create
a new ramdisk from inside the sles.disk instead - that has uses the fstab of the
sles.disk, etc.
> > 
> > cpus = "1"
> > 
> > vcpus = 2
> > 
> > memory = 256
> > 
> > name = "sles"
> > 
> > root="/dev/hda1 ro"
> > 
> > =====8<====================
> > 
> > 
> > 
> > Of course, sles.disk is a reiserfs image containing unTARred 
> > SLES9.3 64bit OS.
> I hope you don''t use reiserfs on reiserfs here - as if you do and
you ever need to "fsck" the underlaying disk, then you''ll get
problems - reiserfs uses a "magic word" to indicate where it starts
it''s filesystem, and finding another (same) magic word in the middle of
the file-system is most certainly going to make things very confused when trying
to figure out what''s what.


I DO use reiserfs onto reiserfs. Sounds very strange - magics can confuse fsck?
Do you have some additional info on this behaviour? Some link or the like? It
would be interesting to look at.


> > 
> > 
> > 
> > The domain console outputs nothing but several spaces at the 
> > very start and the domU hangs in a few (15-25) seconds.
> "Interesting". Not sure what that could be. 
> > 
> > 
> > 
> > What are log files to analyze? What are ''debug''
options?
> I''d start with "xm dmesg". If that''s not saying
anything useful, look at /var/log/xen/xend.log and .../xend-debug.log


Only following files present there:



domain-builder-ng.log

qemu-dm.25423.log

qemu-dm.3345.log

xen-hotplug.log



xm dmesg is very interesting, thank you. Seems that every attempt to launch a
domU yelds the following:



(XEN) mm.c:636:d0 Error getting mfn 100 (pfn 5555555555555555) from L1 entry
8000000000100125 for dom32753



Also I saw some other strange lines from "xm dmesg" like this:



(XEN) microcode: CPU6 not a capable Intel processor



Not sure whether they appear when I experiment with HVM domUs...




> These may also not contain anything useful - but it would be where
I''d start trying to figure out what''s wrong.
> > 
> > 
> > 
> > I managed to run dom0  which is behaving not so bad. 
> > 
> > Only several ''segfault''s in dmesg confuse me.
> Where are those segfualts from?


Well, I was trying to compile dev86 there and the ncc compiler sigfaulted. Also
irqbalance sigfaulted:



irqbalance[3258]: segfault at 0000000000528018 rip 00000000004016ba rsp
00007fff9cf9b8f0 error 4


> > 
> > 
> > 
> > I use SUN X4600 server which is of 64bits, 32gigs and 16 virtual CPUs.
> I expect this to be capable of running Xen for sure. 
> --
> Mats



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Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Petersson, Mats

2007-Jun-25 16:00 UTC

head link

RE: [Xen-users] xen 3.1 - domU hangs just after "xm create"

> -----Original Message-----
> From: Сергей Лукашевич [mailto:lukash33@yandex.ru] 
> Sent: 25 June 2007 16:30
> To: Petersson, Mats
> Cc: xen-users@lists.xensource.com
> Subject: Re: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> 
> 
> 
> 25.06.07, 18:34, Petersson, Mats <Mats.Petersson@amd.com> <>:
> 
> >  
> > > -----Original Message-----
> > > From: xen-users-bounces@lists.xensource.com 
> > > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> > > ?????? ?????????
> > > Sent: 25 June 2007 15:26
> > > To: xen-users@lists.xensource.com
> > > Subject: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> > > 
> > > What are methods to debug domU when it hangs? Using xen 3.1 
> > > compiled from sources I could not manage to launch no domU. 
> > > Fot instance, I run something like this:
> > > 
> > > 
> > > 
> > > =====8<====================> > > 
> > > disk = [ ''file:/oradata-act/sles.disk,hda1,w'',
'',hdc:cdrom,r'' ]
> > > 
> > > kernel = "/boot/vmlinuz-2.6.18-xen"
> > > 
> > > ramdisk = "/boot/initrd-2.6.18-xen"
> > I take it this is the same initrd you use for Dom0? Does it 
> have the drivers for DomU too?
> 
> Yes, the same kernel and the same initrd. I beleive XEN 
> allows using same here from some of 2.* versions, is not it? 
Same kernel is no problem at all - that''s normal operating procedure
for most people - although some will argue that the kernel is slightly larger
this way compared to when you have a DomU specific kerne.

Yes, it''s just that sometimes the initrd contains "stuff"
that is corresponding to the management of Dom0 that conflicts with the usage on
DomU - typical example is LVM management, but there''s other things that
cause this too.
> Initrd contains reiserfs driver - that''s quite enough to 
> start booting. I suspect something wrong with my compiling 
> and installing XEN because domUs output NO lines to their 
> consoles to suspect its kernel.

I agree, there''s probably something wrong in your system on a more
fundamental level. > 
> > You may want to mount the sles.disk and use "mkinitrd" to 
> create a new ramdisk from inside the sles.disk instead - that 
> has uses the fstab of the sles.disk, etc. 
> > > 
> > > cpus = "1"
> > > 
> > > vcpus = 2
> > > 
> > > memory = 256
> > > 
> > > name = "sles"
> > > 
> > > root="/dev/hda1 ro"
> > > 
> > > =====8<====================> > > 
> > > 
> > > 
> > > Of course, sles.disk is a reiserfs image containing unTARred 
> > > SLES9.3 64bit OS.
> > I hope you don''t use reiserfs on reiserfs here - as if you 
> do and you ever need to "fsck" the underlaying disk, then 
> you''ll get problems - reiserfs uses a "magic word" to 
> indicate where it starts it''s filesystem, and finding another 
> (same) magic word in the middle of the file-system is most 
> certainly going to make things very confused when trying to 
> figure out what''s what. 
> 
> I DO use reiserfs onto reiserfs. Sounds very strange - magics 
> can confuse fsck? Do you have some additional info on this 
> behaviour? Some link or the like? It would be interesting to look at.
> 
> > > 
> > > 
> > > 
> > > The domain console outputs nothing but several spaces at the 
> > > very start and the domU hangs in a few (15-25) seconds.
> > "Interesting". Not sure what that could be. 
> > > 
> > > 
> > > 
> > > What are log files to analyze? What are ''debug''
options?
> > I''d start with "xm dmesg". If that''s not
saying anything
> useful, look at /var/log/xen/xend.log and .../xend-debug.log
> 
> Only following files present there:
> 
> domain-builder-ng.log
> qemu-dm.25423.log
> qemu-dm.3345.log
> xen-hotplug.log
Surely you should have a /var/log/xen/xend.log too. 

By the way, what is "builder" in your config file? Qemu-dm indicates
that you''re trying to start a HVM domain - in which case your
"kernel" shouldn''t be a linux kernel, but rather
"hvmbuilder". > 
> xm dmesg is very interesting, thank you. Seems that every 
> attempt to launch a domU yelds the following:
> 
> (XEN) mm.c:636:d0 Error getting mfn 100 (pfn 
> 5555555555555555) from L1 entry 8000000000100125 for dom32753
This may be harmfull - not sure. > 
> Also I saw some other strange lines from "xm dmesg" like this:
> 
> (XEN) microcode: CPU6 not a capable Intel processor
At first I though this was due to your processors being AMD models, but I
suspect that with 16 "virtual cores", you have the Xeon model of X4600
rather than the AMD one.

I''d ignore it anyways, as you most likely have the relevant microcode
loaded by the BIOS. > 
> Not sure whether they appear when I experiment with HVM domUs...
> 
> 
> > These may also not contain anything useful - but it would 
> be where I''d start trying to figure out what''s wrong. 
> > > 
> > > 
> > > 
> > > I managed to run dom0  which is behaving not so bad. 
> > > 
> > > Only several ''segfault''s in dmesg confuse me.
> > Where are those segfualts from?
> 
> Well, I was trying to compile dev86 there and the ncc 
> compiler sigfaulted. Also irqbalance sigfaulted:
> 
> irqbalance[3258]: segfault at 0000000000528018 rip 
> 00000000004016ba rsp 00007fff9cf9b8f0 error 4
They shouldn''t fail like that. > 
> > > 
> > > 
> > > 
> > > I use SUN X4600 server which is of 64bits, 32gigs and 16 
> virtual CPUs.
> > I expect this to be capable of running Xen for sure. 
> > --
> > Mats
> 
> 
> 
> 


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Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Сергей Лукашевич

2007-Jun-25 16:22 UTC

head link

Re: [Xen-users] xen 3.1 - domU hangs just after "xm create"

Thank you, Mats for carefully answering my writings.
Now I managed to get xend.log by uncommenting it at my /etc/xen/xend-config.sxp.
And I could reproduce the following case:

http://lists.xensource.com/archives/html/xen-users/2007-06/msg00766.html

More precisely:

[2007-06-25 19:53:23 17224] ERROR (XendDomainInfo:105) Domain construction
failed
Traceback (most recent call last):
  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 103, in
create_from_dict
    vm.start()
  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 420, in
start
    raise XendError(''VM already running'')
XendError: VM already running
[2007-06-25 19:53:23 17224] DEBUG (XendDomainInfo:1660) XendDomainInfo.destroy:
domid=26
[2007-06-25 19:53:23 17224] ERROR (XendDomainInfo:1231) Failed to restart domain
26.
Traceback (most recent call last):
  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 1216, in
_restart
    new_dom = XendDomain.instance().domain_create_from_dict(
  File "//usr/lib64/python/xen/xend/XendDomain.py", line 932, in
domain_create_from_dict
    dominfo = XendDomainInfo.create_from_dict(config_dict)
  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 103, in
create_from_dict
    vm.start()
  File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 420, in
start
    raise XendError(''VM already running'')
XendError: VM already running


Though I can not understand the solution (with kernel recompile) mentioned in
the Thread above.

Looks different from what I started. Now domU is crashed, not hangs.
I tried to rename it and it effectively hangs again leaving the following in the
xend.log (sorry for long output):

[2007-06-25 20:13:40 14796] DEBUG (DevController:117) DevController: writing
{''domain'': ''sles1'',
''protocol'': ''vt100'',
''uuid'':
''22931fbd-2160-d624-0b03-25c683fc39f5'',
''frontend'':
''/local/domain/27/device/console/0'',
''state'': ''1'', ''location'':
''2'', ''online'': ''1'',
''frontend-id'': ''27''} to
/local/domain/0/backend/console/27/0.
[2007-06-25 20:13:40 17795] DEBUG (DevController:148) Waiting for devices vif.
[2007-06-25 20:13:40 14796] DEBUG (XendDomainInfo:824) Storing domain details:
{''console/ring-ref'': ''8104036'',
''image/entry'': ''-2145386496'',
''console/port'': ''2'',
''store/ring-ref'': ''8104037'',
''image/loader'': ''generic'',
''vm'':
''/vm/05aa56d4-5df5-d9bf-5fbd-b881074f6ee4'',
''control/platform-feature-multiprocessor-suspend'':
''1'', ''image/guest-os'':
''linux'', ''cpu/1/availability'':
''online'',
''image/features/writable-descriptor-tables'':
''1'', ''image/virt-base'':
''-2147483648'', ''memory/target'':
''262144'', ''image/guest-version'':
''2.6'',
''image/features/supervisor-mode-kernel'':
''1'', ''console/limit'':
''1048576'', ''image/paddr-offset'':
''-2147483648'', ''image/hypercall-page'':
''-2145361920'', ''image/suspend-cancel'':
''1'', ''cpu/0/availability'':
''online'',
''image/features/pae-pgdir-above-4gb'': ''1'',
''image/features/writable-page-tables'': ''1'',
''image/features/auto-translated-physmap'':
''1'', ''name'': ''sles1'',
''domid'': ''27'',
''image/xen-version'': ''xen-3.0'',
''store/port'': ''1''}
[2007-06-25 20:13:40 17795] DEBUG (DevController:148) Waiting for devices usb.
[2007-06-25 20:13:40 17795] DEBUG (DevController:148) Waiting for devices vbd.
[2007-06-25 20:13:40 17795] DEBUG (DevController:153) Waiting for 769.
[2007-06-25 20:13:40 14796] DEBUG (XendDomainInfo:908)
XendDomainInfo.handleShutdownWatch
[2007-06-25 20:13:40 14796] DEBUG (DevController:539) hotplugStatusCallback
/local/domain/0/backend/vbd/27/769/hotplug-status.
[2007-06-25 20:13:40 14796] DEBUG (DevController:539) hotplugStatusCallback
/local/domain/0/backend/vbd/27/769/hotplug-status.
[2007-06-25 20:13:40 14796] DEBUG (DevController:553) hotplugStatusCallback 1.
[2007-06-25 20:13:40 17795] DEBUG (DevController:153) Waiting for 5632.
[2007-06-25 20:13:40 14796] DEBUG (DevController:539) hotplugStatusCallback
/local/domain/0/backend/vbd/27/5632/hotplug-status.
[2007-06-25 20:13:41 14796] DEBUG (DevController:539) hotplugStatusCallback
/local/domain/0/backend/vbd/27/5632/hotplug-status.
[2007-06-25 20:13:41 14796] DEBUG (DevController:553) hotplugStatusCallback 1.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices irq.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices vkbd.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices vfb.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices
console.
[2007-06-25 20:13:41 17795] DEBUG (DevController:153) Waiting for 0.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices pci.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices
ioports.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices tap.
[2007-06-25 20:13:41 17795] DEBUG (DevController:148) Waiting for devices vtpm.
[2007-06-25 20:13:41 17989] INFO (XendDomain:1108) Domain sles1 (27) unpaused.


Please advice, what would be best ways to go on debuging?



25.06.07, 20:00, Petersson, Mats <Mats.Petersson@amd.com> <>:
>  
> > -----Original Message-----
> > From: Сергей Лукашевич [mailto:lukash33@yandex.ru] 
> > Sent: 25 June 2007 16:30
> > To: Petersson, Mats
> > Cc: xen-users@lists.xensource.com
> > Subject: Re: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> > 
> > 
> > 
> > 25.06.07, 18:34, Petersson, Mats <Mats.Petersson@amd.com>
<>:
> > 
> > >  
> > > > -----Original Message-----
> > > > From: xen-users-bounces@lists.xensource.com 
> > > > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> > > > ?????? ?????????
> > > > Sent: 25 June 2007 15:26
> > > > To: xen-users@lists.xensource.com
> > > > Subject: [Xen-users] xen 3.1 - domU hangs just after
"xm create"
> > > > 
> > > > What are methods to debug domU when it hangs? Using xen 3.1 
> > > > compiled from sources I could not manage to launch no domU. 
> > > > Fot instance, I run something like this:
> > > > 
> > > > 
> > > > 
> > > > =====8<====================> > > > 
> > > > disk = [
''file:/oradata-act/sles.disk,hda1,w'',
'',hdc:cdrom,r'' ]
> > > > 
> > > > kernel = "/boot/vmlinuz-2.6.18-xen"
> > > > 
> > > > ramdisk = "/boot/initrd-2.6.18-xen"
> > > I take it this is the same initrd you use for Dom0? Does it 
> > have the drivers for DomU too?
> > 
> > Yes, the same kernel and the same initrd. I beleive XEN 
> > allows using same here from some of 2.* versions, is not it? 
> Same kernel is no problem at all - that''s normal operating
procedure for most people - although some will argue that the kernel is slightly
larger this way compared to when you have a DomU specific kerne.
> Yes, it''s just that sometimes the initrd contains
"stuff" that is corresponding to the management of Dom0 that conflicts
with the usage on DomU - typical example is LVM management, but there''s
other things that cause this too.
> > Initrd contains reiserfs driver - that''s quite enough to 
> > start booting. I suspect something wrong with my compiling 
> > and installing XEN because domUs output NO lines to their 
> > consoles to suspect its kernel.
> I agree, there''s probably something wrong in your system on a more
fundamental level.
> > 
> > > You may want to mount the sles.disk and use "mkinitrd"
to
> > create a new ramdisk from inside the sles.disk instead - that 
> > has uses the fstab of the sles.disk, etc. 
> > > > 
> > > > cpus = "1"
> > > > 
> > > > vcpus = 2
> > > > 
> > > > memory = 256
> > > > 
> > > > name = "sles"
> > > > 
> > > > root="/dev/hda1 ro"
> > > > 
> > > > =====8<====================> > > > 
> > > > 
> > > > 
> > > > Of course, sles.disk is a reiserfs image containing unTARred
> > > > SLES9.3 64bit OS.
> > > I hope you don''t use reiserfs on reiserfs here - as if
you
> > do and you ever need to "fsck" the underlaying disk, then 
> > you''ll get problems - reiserfs uses a "magic word"
to
> > indicate where it starts it''s filesystem, and finding another
> > (same) magic word in the middle of the file-system is most 
> > certainly going to make things very confused when trying to 
> > figure out what''s what. 
> > 
> > I DO use reiserfs onto reiserfs. Sounds very strange - magics 
> > can confuse fsck? Do you have some additional info on this 
> > behaviour? Some link or the like? It would be interesting to look at.
> > 
> > > > 
> > > > 
> > > > 
> > > > The domain console outputs nothing but several spaces at the
> > > > very start and the domU hangs in a few (15-25) seconds.
> > > "Interesting". Not sure what that could be. 
> > > > 
> > > > 
> > > > 
> > > > What are log files to analyze? What are
''debug'' options?
> > > I''d start with "xm dmesg". If that''s
not saying anything
> > useful, look at /var/log/xen/xend.log and .../xend-debug.log
> > 
> > Only following files present there:
> > 
> > domain-builder-ng.log
> > qemu-dm.25423.log
> > qemu-dm.3345.log
> > xen-hotplug.log
> Surely you should have a /var/log/xen/xend.log too. 
> By the way, what is "builder" in your config file? Qemu-dm
indicates that you''re trying to start a HVM domain - in which case your
"kernel" shouldn''t be a linux kernel, but rather
"hvmbuilder".
> > 
> > xm dmesg is very interesting, thank you. Seems that every 
> > attempt to launch a domU yelds the following:
> > 
> > (XEN) mm.c:636:d0 Error getting mfn 100 (pfn 
> > 5555555555555555) from L1 entry 8000000000100125 for dom32753
> This may be harmfull - not sure. 
> > 
> > Also I saw some other strange lines from "xm dmesg" like
this:
> > 
> > (XEN) microcode: CPU6 not a capable Intel processor
> At first I though this was due to your processors being AMD models, but I
suspect that with 16 "virtual cores", you have the Xeon model of X4600
rather than the AMD one.
> I''d ignore it anyways, as you most likely have the relevant
microcode loaded by the BIOS.
> > 
> > Not sure whether they appear when I experiment with HVM domUs...
> > 
> > 
> > > These may also not contain anything useful - but it would 
> > be where I''d start trying to figure out what''s
wrong.
> > > > 
> > > > 
> > > > 
> > > > I managed to run dom0  which is behaving not so bad. 
> > > > 
> > > > Only several ''segfault''s in dmesg confuse
me.
> > > Where are those segfualts from?
> > 
> > Well, I was trying to compile dev86 there and the ncc 
> > compiler sigfaulted. Also irqbalance sigfaulted:
> > 
> > irqbalance[3258]: segfault at 0000000000528018 rip 
> > 00000000004016ba rsp 00007fff9cf9b8f0 error 4
> They shouldn''t fail like that. 
> > 
> > > > 
> > > > 
> > > > 
> > > > I use SUN X4600 server which is of 64bits, 32gigs and 16 
> > virtual CPUs.
> > > I expect this to be capable of running Xen for sure. 
> > > --
> > > Mats
> > 
> > 
> > 
> > 
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Petersson, Mats

2007-Jun-25 16:45 UTC

head link

RE: [Xen-users] xen 3.1 - domU hangs just after "xm create"

> -----Original Message-----
> From: Сергей Лукашевич [mailto:lukash33@yandex.ru] 
> Sent: 25 June 2007 17:23
> To: Petersson, Mats
> Cc: xen-users@lists.xensource.com
> Subject: Re: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> 
> Thank you, Mats for carefully answering my writings.
> Now I managed to get xend.log by uncommenting it at my 
> /etc/xen/xend-config.sxp.
> And I could reproduce the following case:
> 
> http://lists.xensource.com/archives/html/xen-users/2007-06/msg
> 00766.html
> 
> More precisely:
> 
> [2007-06-25 19:53:23 17224] ERROR (XendDomainInfo:105) Domain 
> construction failed
> Traceback (most recent call last):
>   File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 
> 103, in create_from_dict
>     vm.start()
>   File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 
> 420, in start
>     raise XendError(''VM already running'')
> XendError: VM already running
> [2007-06-25 19:53:23 17224] DEBUG (XendDomainInfo:1660) 
> XendDomainInfo.destroy: domid=26
> [2007-06-25 19:53:23 17224] ERROR (XendDomainInfo:1231) 
> Failed to restart domain 26.
> Traceback (most recent call last):
>   File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 
> 1216, in _restart
>     new_dom = XendDomain.instance().domain_create_from_dict(
>   File "//usr/lib64/python/xen/xend/XendDomain.py", line 932, 
> in domain_create_from_dict
>     dominfo = XendDomainInfo.create_from_dict(config_dict)
>   File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 
> 103, in create_from_dict
>     vm.start()
>   File "//usr/lib64/python/xen/xend/XendDomainInfo.py", line 
> 420, in start
>     raise XendError(''VM already running'')
> XendError: VM already running
So, the kernel crashes, and when it tries to restart, the old one
hasn''t gone yet (maybe it never will??).


Not sure what to say here. Obviously, the kernel itself should be fine, as Dom0
works fine.

Not sure what the "solution" refers to either - I guess it says
"change the settings for pre-emption model and frequency" to something
else - but what I don''t really know.

There''s nothing that says "this is wrong" in the xend.log as
far as I can see (but this is just the last few lines, right?)

--
Mats
[snip lots of logs and old comments]



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Сергей Лукашевич

2007-Jun-26 14:54 UTC

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Re: [Xen-users] xen 3.1 - domU hangs just after "xm create"

After my changing from ''reboot on crash'' to ''destroy
on crash'' the domain is simply crashing every time in a few seconds
with the following in the xend.log:



[2007-06-26 14:25:26 9539] WARNING (XendDomainInfo:1065) Domain has crashed:
name=sles id=12.



Also I have "xm dmesg", "/var/log/messages" and
"domain-builder-ng.log" to look at. But nothing suspictious except the
following lines in the



Jun 26 14:21:19 xen-ice /sbin/hotplug[23560]: /etc/hotplug/xen-backend.agent:
line 14: sigerr: command not found



and later on





Jun 26 14:21:36 xen-ice kernel: irqbalance[3488]: segfault at 0000000000528238
rip 00000000004016ba rsp 00007fff01578ed0 error 4





How could I guess reasons of the crash please. Will my posting more logs help?







25.06.07, 20:45, Petersson, Mats <Mats.Petersson@amd.com> <>:


> So, the kernel crashes, and when it tries to restart, the old one
hasn''t gone yet (maybe it never will??).
> Not sure what to say here. Obviously, the kernel itself should be fine, as
Dom0 works fine.
> Not sure what the "solution" refers to either - I guess it says
"change the settings for pre-emption model and frequency" to something
else - but what I don''t really know.
> There''s nothing that says "this is wrong" in the
xend.log as far as I can see (but this is just the last few lines, right?)
> --
> Mats
> [snip lots of logs and old comments]



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Petersson, Mats

2007-Jun-26 15:47 UTC

head link

RE: [Xen-users] xen 3.1 - domU hangs just after "xm create"

> -----Original Message-----
> From: Сергей Лукашевич [mailto:lukash33@yandex.ru] 
> Sent: 26 June 2007 15:54
> To: Petersson, Mats
> Cc: xen-users@lists.xensource.com
> Subject: Re: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> 
> 
> After my changing from ''reboot on crash'' to
''destroy on
> crash'' the domain is simply crashing every time in a few 
> seconds with the following in the xend.log:
> 
> [2007-06-26 14:25:26 9539] WARNING (XendDomainInfo:1065) 
> Domain has crashed: name=sles id=12.
> 
> Also I have "xm dmesg", "/var/log/messages" and 
> "domain-builder-ng.log" to look at. But nothing suspictious 
> except the following lines in the
> 
> Jun 26 14:21:19 xen-ice /sbin/hotplug[23560]: 
> /etc/hotplug/xen-backend.agent: line 14: sigerr: command not found
> 
> and later on
> 
> 
> Jun 26 14:21:36 xen-ice kernel: irqbalance[3488]: segfault at 
> 0000000000528238 rip 00000000004016ba rsp 00007fff01578ed0 error 4
This is a bit suspicious - maybe you could turn off "irqbalance" just
to see if it helps - it appears from what I read that it''s not really
required (it''s a good idea to have it, but the system should operate
without it).

--
Mats> 
> 
> How could I guess reasons of the crash please. Will my 
> posting more logs help?
> 
> 
> 
> 25.06.07, 20:45, Petersson, Mats <Mats.Petersson@amd.com> <>:
> 
> > So, the kernel crashes, and when it tries to restart, the 
> old one hasn''t gone yet (maybe it never will??). 
> > Not sure what to say here. Obviously, the kernel itself 
> should be fine, as Dom0 works fine. 
> > Not sure what the "solution" refers to either - I guess it 
> says "change the settings for pre-emption model and 
> frequency" to something else - but what I don''t really know. 
> > There''s nothing that says "this is wrong" in the
xend.log
> as far as I can see (but this is just the last few lines, right?)
> > --
> > Mats
> > [snip lots of logs and old comments]
> 
> 
> 
> 


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Сергей Лукашевич

2007-Jun-27 14:13 UTC

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Re: [Xen-users] xen 3.1 - domU hangs just after "xm create"

Thank you, Mats, again for your support.

I''ve just found the solution. It sound like this:



If XEN requires <<at least>> GCC 3.4, never use GCC 4.2!



For me I''ve just recompiled XEN 3.1 with GCC 3.4 and problems went
away: crashing domUs, sigfaults in dom0, and hangind domUs.







25.06.07, 18:34, Petersson, Mats <Mats.Petersson@amd.com> <>:


>  
> > -----Original Message-----
> > From: xen-users-bounces@lists.xensource.com 
> > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> > ?????? ?????????
> > Sent: 25 June 2007 15:26
> > To: xen-users@lists.xensource.com
> > Subject: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> > 
> > What are methods to debug domU when it hangs? Using xen 3.1 
> > compiled from sources I could not manage to launch no domU. 
> > Fot instance, I run something like this:
> > 
> > 


.... SKIP ......




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Petersson, Mats

2007-Jun-27 14:26 UTC

head link

RE: [Xen-users] xen 3.1 - domU hangs just after "xm create"

> -----Original Message-----
> From: Сергей Лукашевич [mailto:lukash33@yandex.ru] 
> Sent: 27 June 2007 15:14
> To: Petersson, Mats
> Cc: xen-users@lists.xensource.com
> Subject: Re: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> 
> Thank you, Mats, again for your support.
> I''ve just found the solution. It sound like this:
> 
> If XEN requires <<at least>> GCC 3.4, never use GCC 4.2!
Congratulations on solving the problem.

Yes, I guess gcc 4.2 might contain bugs that are only apparent when using it for
Xen...

--
Mats> 
> For me I''ve just recompiled XEN 3.1 with GCC 3.4 and problems 
> went away: crashing domUs, sigfaults in dom0, and hangind domUs.
> 
> 
> 
> 25.06.07, 18:34, Petersson, Mats <Mats.Petersson@amd.com> <>:
> 
> >  
> > > -----Original Message-----
> > > From: xen-users-bounces@lists.xensource.com 
> > > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of 
> > > ?????? ?????????
> > > Sent: 25 June 2007 15:26
> > > To: xen-users@lists.xensource.com
> > > Subject: [Xen-users] xen 3.1 - domU hangs just after "xm
create"
> > > 
> > > What are methods to debug domU when it hangs? Using xen 3.1 
> > > compiled from sources I could not manage to launch no domU. 
> > > Fot instance, I run something like this:
> > > 
> > > 
> 
> .... SKIP ......
> 
> 
> 
> 


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