A couple of times I experienced that after a couple hours of "xm
create"/"xm destroy", the machine will crash:
with the following on the console.

XEN) Domain[20].0: initializing
cpu 0x0: Vector: 700 (Program Check) at [c000000077ed7810]
    pc: c000000000047834: .alloc_vm_area+0xe4/0xf0
    lr: c000000000047774: .alloc_vm_area+0x24/0xf0
    sp: c000000077ed7a90
   msr: 8000000000029032
  current = 0xc000000077ed1140
  paca    = 0xc0000000005ae200
    pid   = 130, comm = xenwatch
kernel BUG in alloc_vm_area at 
/root/xen-maria-latest/linux/linux-xen-ppc/arch/powerpc/platforms/xen/util.c:17!
enter ? for help
0:mon>  t
[c000000077ed7b20] c000000000300e34 .blkif_map+0x74/0x1b0
[c000000077ed7bf0] c000000000300334 .frontend_changed+0x164/0x1f0
[c000000077ed7ca0] c0000000002fd2f0 .otherend_changed+0x100/0x110
[c000000077ed7d40] c0000000002f9d44 .xenwatch_handle_callback+0x44/0xa0
[c000000077ed7dd0] c0000000002faf74 .xenwatch_thread+0x1b4/0x1f0
[c000000077ed7ee0] c000000000078ebc .kthread+0x11c/0x170
[c000000077ed7f90] c0000000000293b4 .original_kernel_thread+0x4c/0x68
0:mon> 


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