Two problems with DomU reboot (cmdline, duplicate domains)

[Florian Kirstein <xenlist@custom.ray.net>]

Hi,

just upgraded my testsystem to 3.0.4 (using the provided source rpm,
xen-3.0.4.1-1.src.rpm, rebuilt it to run on non-PXE but no changes besides
that, and it doesn't look like the 3.0.4-testing HG has major differences
so far?) and I have two problems with rebooting domains (xm reboot, or
reboot from inside the domain).

1) the kernel-commandline keeps growing. On the first boot it's OK, on
the second it's there 3-times as one long cmdline:
ip=172.16.37.9:1.2.3.4:172.16.37.19:255.255.255.0::eth0:off root=/dev/sda1 ro ip=172.16.37.9:1.2.3.4:172.16.37.19:255.255.255.0::eth0:off root=/dev/sda1 ro ip=172.16.37.9:1.2.3.4:172.16.37.19:255.255.255.0::eth0:off root=/dev/sda1 ro
and on the next reboot it's longer than the kernel supports, which usually
breaks networking as the kernel seems to use the last "ip=" parameter which
most probably is incomplete then. It also happens when I don't specify
networking there, using a config almost identical to xmexample1, after
the first reboot:
# cat /proc/cmdline 
root=/dev/sda1 ro root=/dev/sda1 ro root=/dev/sda1 ro 3
interesting that the "3" from the "extra" parameter is not doubled...

2) it happend twice so far (non-reproducable for me yet) that after
a reboot I had the same DomU twice, using the same name and the same
blockdevices (LVM based phy: devices). This of course resulted in
major data corruption and really doesn't make me feel well. I read
there were changes in the code which should prevent this, but
for me it seems like it got worse, had this never before...

Thanks for any ideas for this, will try the current 3.0.4-testing
hg later, but as I currently can't reproduce "2)" I hope someone
here knows if this is fixed and by what this could have been
triggered? 

(:ul8er, r@y
P.S: Oh, I could reproduce it a third time, think I just issued another
reboot on the domain. Probably while having a libvirt-based tool list
domains in the background, doing some tests there now... However, this
is how it looks:
DomU9                                     72    50     1     -b----      8.8
DomU9                                     73    50     1     -b----      8.1
and both are actually running, I can attach to both consoles using
/usr/lib/xen/bin/xenconsole 72 
/usr/lib/xen/bin/xenconsole 73
and they are indeed different instances running on the same blockdevices.
Ouch :)

P.P.S: Here's an excerpt from the xend.log (from the first time it
happend) which I suppose shows the part where the duplicate Domain
was created, unfortunately the log-level was set to INFO:

[2007-01-17 16:28:04 xend.XendDomainInfo 12761] INFO (XendDomainInfo:969) Domain
 has shutdown: name=DomU9 id=18 reason=reboot.
[2007-01-17 16:28:04 xend.XendDomainInfo 12761] INFO (XendDomainInfo:969) Domain
 has shutdown: name=DomU9 id=18 reason=reboot.
[2007-01-17 16:28:04 xend.XendDomainInfo 12761] INFO (XendDomainInfo:969) Domain
 has shutdown: name=DomU9 id=18 reason=reboot.
[2007-01-17 16:28:05 xend.XendDomainInfo 12761] ERROR (XendDomainInfo:1063) Xend
 failed during restart of domain None.  Refusing to restart to avoid loops.
[2007-01-17 16:28:05 xend.XendConfig 12761] WARNING (XendConfig:606) Unconverted
 key: cpus
[2007-01-17 16:28:05 xend 12761] INFO (image:125) buildDomain os=linux dom=19 vc
pus=1
[2007-01-17 16:28:05 xend.XendDomainInfo 12761] INFO (XendDomainInfo:1194) creat
eDevice: vbd : {'uuid': '5f42ac79-37a5-3511-5586-d215a356aa2d', 'driver': 'parav
irtualised', 'dev': 'sda1:disk', 'uname': 'phy:/dev/vgrc/h_root_110', 'mode': 'w
', 'backend': 0}
[2007-01-17 16:28:05 xend.XendDomainInfo 12761] INFO (XendDomainInfo:1194) creat
eDevice: vbd : {'uuid': 'a6f7ccdb-f331-211f-1721-22a8d7aa2097', 'driver': 'parav
irtualised', 'dev': 'sda2:disk', 'uname': 'phy:/dev/vgrc/swap110', 'mode': 'w', 
'backend': 0}
[2007-01-17 16:28:05 xend.XendDomainInfo 12761] INFO (XendDomainInfo:1194) creat
eDevice: vif : {'ip': '172.16.37.9', 'mac': '00:16:3e:00:32:f1', 'script': 'vi
f-route', 'uuid': '28a916b8-0e7c-cd43-81b6-fd35bf48ecae', 'backend': 0}
[2007-01-17 16:28:06 xend.XendConfig 12761] WARNING (XendConfig:606) Unconverted
 key: cpus
[2007-01-17 16:28:06 xend 12761] INFO (image:125) buildDomain os=linux dom=20 vc
pus=1
[2007-01-17 16:28:06 xend.XendDomainInfo 12761] INFO (XendDomainInfo:1194) creat
eDevice: vbd : {'uname': 'phy:/dev/vgrc/h_root_110', 'driver': 'paravirtualised'
, 'mode': 'w', 'dev': 'sda1', 'uuid': '5f42ac79-37a5-3511-5586-d215a356aa2d'}
[2007-01-17 16:28:06 xend.XendDomainInfo 12761] INFO (XendDomainInfo:1194) creat
eDevice: vbd : {'uname': 'phy:/dev/vgrc/swap110', 'driver': 'paravirtualised', '
mode': 'w', 'dev': 'sda2', 'uuid': 'a6f7ccdb-f331-211f-1721-22a8d7aa2097'}
[2007-01-17 16:28:06 xend.XendDomainInfo 12761] INFO (XendDomainInfo:1194) creat
eDevice: vif : {'ip': '172.16.37.9', 'mac': '00:16:3e:00:32:f1', 'script': 'vi
f-route', 'uuid': '28a916b8-0e7c-cd43-81b6-fd35bf48ecae', 'backend': 0}