Re: [Xen-devel] Re: Dom0 panic on xen 3.4.3

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Dec 27, 2010 at 04:50:04PM -0800, prickett233 wrote:
> 
> We also experience this same problem with the dom0 crashing when multiple
> domU's are starting up at the same time.  Our setup consists of a dual pair
> CentOS 5.5 running LVM/DRBD/Xen and have tried the default EL Xen version
> 3.0.3-105 including other newer versions (3.4.0 and 3.4.3) from the GITCO
> repo [ http://www.gitco.de/repo/ ] with the crashing still occurring
> independent of Xen version.
> 
> >From the kernel crash output we found a related post here [
> http://lists.linbit.com/pipermail/drbd-user/2009-March/011652.html ] that
> discusses a problem with I/O and network interface affecting DRBD.  By
> turning off scatter/gather on the dom0's network interface we no longer
> experience crashes in the dom0.
> 
> We came across this crashing issue when migrating our Xen VM's to newer
> servers, but when running on our older servers the dom0 did not crash.  As
> this issue appears to be related to the network driver/chipset, for the
> record and hopefully our results will be useful to others,  the difference
> between these servers NIC is;
> 
> ----
> 
> Old servers (CentOS 5.3)  without dom0 crashing, uses tg3 network driver:
> 
> $ uname -a
> Linux ldx12020 2.6.18-128.4.1.el5xen #1 SMP Tue Aug 4 20:51:12 EDT 2009
> x86_64 x86_64 x86_64 GNU/Linux
> 
> $ lspci
> 03:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722 Gigabit
> Ethernet PCI Express
> 04:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722 Gigabit
> Ethernet PCI Express
> 
> $ ethtool -i eth0
> driver: tg3
> version: 3.93
> firmware-version: 5722-v3.07, ASFIPMI v6.02
> bus-info: 0000:03:00.0
> 
> ----
>  
> New servers with dom0 crashing, uses bnx2 network driver:
> 
> $ uname -a
> Linux tnx176 2.6.18-194.26.1.el5xen #1 SMP Tue Nov 9 13:35:30 EST 2010
> x86_64 x86_64 x86_64 GNU/Linux
> 
> $ lspci
> 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709
> Gigabit Ethernet (rev 20)
> 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709
> Gigabit Ethernet (rev 20)
> 02:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709
> Gigabit Ethernet (rev 20)
> 02:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709
> Gigabit Ethernet (rev 20)
> 
> $ ethtool -i eth0
> Cannot get driver information: Operation not supported
> 
> dmesg output: Broadcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.0.2 (Aug
> 21, 2009)
> 
> ----
> 
> Hopefully we can see this bug fixed.
> 
> 

Did you open a bug about this to Redhat bugzilla? 

Do you have a serial console set up and logging both the hypervisor
and dom0 linux kernel, so you can see what errors you get when it crashes?

-- Pasi


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