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[Xen-users] Segmentation Fault when Starting domUs

Hello everyone,

I just put together a brand new system, and I'm getting the following
when I try to start a domU:

> [ 1902.049066] xend[12924]: segfault at b9ff6cd8 ip 00007f36c474afe1 sp 
> 00007f36b9ff6af8 error 4 in libxenguest.so.4.0.0[7f36c4730000+24000]

This is on an AMD CPU with the AVX instructions, and I already have
this in my grub.cfg:

> multiboot  /xen-4.1.2.gz dom0_mem=3072M dom0_max_vcpus=2 dom0_vcpus_pin 
> xsave=1

Before adding xsave=1, programs like gdb and xm would crash; after
adding it, they don't but xend still does.

Here's my uname -a:

> Linux superbob 3.3.3-1-ARCH #1 SMP PREEMPT Mon Apr 23 09:41:07 CEST 2012 
> x86_64 AMD Opteron(tm) Processor 4238 AuthenticAMD GNU/Linux

I have Arch Linux's glibc 2.15-10 and xen 4.1.2-1.  I haven't worked
with Xen before, so I don't have any experience with a working domU.

This is my domU's config:

> kernel = "/boot/vmlinuz-linux"
> ramdisk = "/boot/initramfs-linux.img"
> memory = 4096
> name = "vflex"
> vif = [ 'mac=00:16:3e:00:47:01' ]
> vcpus=2
> disk = [ 'phy:/dev/sda7,xvdb,w', 'phy:/dev/sda6,xvda,w']
> hostname = "vflex"
> root = "/dev/xvdb ro"

The kernel and ramdisk are the standard ones I'm currently running in
my dom0, and include: xen_netfront xen-blkfront xen-pcifront xenfs

Neither the Arch Linux nor Xen IRC channels were able to help.  What
can I do to get this working?

- Neil

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