[Xen-users] XenExpress HVM: netback grant fails

[Ondrej Kraus <krauso-xen@xxxxxxx>]

Hello,

during this week, I have installed new Windows 2003 virtual machine
under XenExpress 3.1.0. Then I migrated web sites into this new server.
Everything worked fine, but after 20 hours virtual machine creshed and
rebooted. The same situation then repeated 2 times, so we have 3 crashes
within a day.

XenExpress is installed od Dell PowerEdge 860 with Xeon 3060 and 4GB of
memory. I installed PV drivers in VM. This VM has 2GB of memory and 3
virtual disks. There is another VM with W2003 installed, equipped with
1G of memory and 2 disks. This another VM is stable, but is not under as
high load as crashing one.

Here is log of second crash from Dom-0:

Jan 27 18:57:42 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[9811]:
Warning: try write to xen platform mmio space
Jan 27 18:57:42 x001 last message repeated 8 times
Jan 27 18:57:42 x001 kernel: #### netback grant fails

this log fragment repeated at least 20 times and then VM rebooted:

Jan 27 18:57:45 x001 kernel: #### netback grant fails
Jan 27 18:57:45 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[9811]:
Warning: try read from xen platform mmio space
Jan 27 18:57:45 x001 kernel: xenbr1: port 3(vif4.0) entering disabled state
Jan 27 18:57:45 x001 kernel: device vif4.0 left promiscuous mode
Jan 27 18:57:45 x001 kernel: xenbr1: port 3(vif4.0) entering disabled state
Jan 27 18:57:45 x001 net.agent[11274]: remove event not handled
Jan 27 18:57:45 x001 net.agent[11308]: remove event not handled
Jan 27 18:57:48 x001 kernel: netbk: WARNING: device 'vif5.0' has
non-zero queue length (32)!
Jan 27 18:57:48 x001 HVMXEN-[11732]: domid: 5
Jan 27 18:57:48 x001 logger: /etc/xen/scripts/vif-bridge: iptables -A
FORWARD -m physdev --physdev-in vif5.0  -j ACCEPT failed. If you are
using iptables, this may affect networking for guest domains.
Jan 27 18:57:48 x001 kernel: device vif5.0 entered promiscuous mode
Jan 27 18:57:48 x001 kernel: ADDRCONF(NETDEV_UP): vif5.0: link is not ready
Jan 27 18:57:50 x001 kernel: device tap0 entered promiscuous mode
Jan 27 18:57:50 x001 kernel: xenbr1: port 4(tap0) entering learning state
Jan 27 18:57:50 x001 kernel: xenbr1: topology change detected, propagating
Jan 27 18:57:50 x001 kernel: xenbr1: port 4(tap0) entering forwarding state
Jan 27 18:57:51 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
shared page at pfn:7feff, mfn: 29364
Jan 27 18:57:51 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
buffered io page at pfn:7fefd, mfn: 29366
Jan 27 18:57:51 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
False I/O request ... in-service already: 0, pvalid: 0, port: 0, data:
0, count: 0, size: 0
Jan 27 18:58:06 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Disconnect IDE hard disk...
Jan 27 18:58:06 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Disconnect netifs...
Jan 27 18:58:06 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Shutdown taps...
Jan 27 18:58:06 x001 kernel: xenbr1: port 4(tap0) entering disabled state
Jan 27 18:58:06 x001 kernel: device tap0 left promiscuous mode
Jan 27 18:58:06 x001 kernel: xenbr1: port 4(tap0) entering disabled state
Jan 27 18:58:06 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
switching to PV shutdown mode...
Jan 27 18:58:06 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Done.
Jan 27 18:58:19 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Disconnect IDE hard disk...
Jan 27 18:58:19 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Disconnect netifs...
Jan 27 18:58:19 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Shutdown taps...
Jan 27 18:58:19 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
switching to PV shutdown mode...
Jan 27 18:58:19 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
failed to unregister watch on /local/domain/5/control/shutdown
Jan 27 18:58:19 x001 HVMXEN-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx[11732]:
Done.
Jan 27 18:58:31 x001 kernel: ADDRCONF(NETDEV_CHANGE): vif5.0: link
becomes ready
Jan 27 18:58:31 x001 kernel: xenbr1: port 3(vif5.0) entering learning state
Jan 27 18:58:31 x001 kernel: xenbr1: topology change detected, propagating
Jan 27 18:58:31 x001 kernel: xenbr1: port 3(vif5.0) entering forwarding
state

Thank you for your quick response.

Ondrej Kraus

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