[Xen-users] Xen 4.1.0 + stable-2.6.32.x kernel = crashes, hangs, reboots

[jesse <thoughtafter@xxxxxxxxx>]

I upgraded a test system from Xen 3.3 to Xen 4.1.0.  I've compiled a
kernel from the xen/stable-2.6.32.x branch from
git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git.  While I
can get virtual machines from Xen 3.3 to run with some configuration
changes I've been unable to keep the host system stable for more than a
few hours when running domU's.  This could be hardware related as this
is hardly server grade hardware.  This is an AMD Athlon X2 on a consumer
motherboard (ASUS I think).  I have run memtest for many hours to see if
this was related to bad memory but all memory has tested fine.  After a
few hours of running domU's the system will either reboot, hard lock
(completely unresponsive), crash (completely unresponsive plus stack
trace displayed), or soft lock (magic sysrq still working).

I've tried running domU's using both xl and xm but both were unstable.
Here is the xen options for the kernel configuration:

CONFIG_XEN=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=128
CONFIG_XEN_SAVE_RESTORE=y
# CONFIG_XEN_DEBUG_FS is not set
CONFIG_SWIOTLB_XEN=y
CONFIG_MICROCODE_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_DOM0_PCI=y
# CONFIG_XEN_PCI_PASSTHROUGH is not set
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=m
CONFIG_XEN_BLKDEV_FRONTEND=m
CONFIG_NETXEN_NIC=m
CONFIG_XEN_NETDEV_FRONTEND=m
CONFIG_XEN_KBDDEV_FRONTEND=m
CONFIG_HVC_XEN=y
CONFIG_XEN_WDT=m
CONFIG_XEN_FBDEV_FRONTEND=m
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=y
CONFIG_XEN_BACKEND=y
CONFIG_XEN_NETDEV_BACKEND=y
CONFIG_XEN_BLKDEV_BACKEND=y
CONFIG_XEN_BLKDEV_TAP=y
CONFIG_XEN_BLKBACK_PAGEMAP=y
CONFIG_XEN_PCIDEV_BACKEND=y
CONFIG_XEN_PCIDEV_BACKEND_VPCI=y
# CONFIG_XEN_PCIDEV_BACKEND_PASS is not set
# CONFIG_XEN_PCIDEV_BACKEND_SLOT is not set
# CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
# CONFIG_XEN_PCIDEV_BE_DEBUG is not set
CONFIG_XENFS=m
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_MCE=y
CONFIG_XEN_XENBUS_FRONTEND=m
CONFIG_XEN_GNTDEV=y
CONFIG_XEN_S3=y
CONFIG_ACPI_PROCESSOR_XEN=y
CONFIG_XEN_PLATFORM_PCI=m

I've attached a couple of screenshots of stack traces when those have
been present.  Are there known problems with stability in Xen 4.1?  Is
this possibly a hardware issue that for some reason was not a problem
under Xen 3.3?  Have I inadvertently enabled an unstable kernel module?
 Any advice on how to move forward and resolve this issue.  I'd like to
upgrade my Xen 3.x servers but only once I can be certain there is a
stable platform for migrate too.

Any advice would be appreciated.  Thank you.

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