BUG: at mm/vmalloc.c:100 vmap_pte_range()
 [<c04550c7>] map_vm_area+0x134/0x1c4
 [<f909c459>] lg_init+0x7a/0x18a [kvm_xen]
 [<f909c1df>] xen_vcpu_create+0x70/0xa5 [kvm_xen]
 [<f9168ee6>] kvm_vm_ioctl+0x89/0x585 [kvm]
 [<c04aedb4>] inode_has_perm+0x5b/0x63
 [<c04cf140>] rb_insert_color+0x8c/0xad
 [<c044c5c2>] vma_prio_tree_insert+0x17/0x2a
 [<c045234b>] vma_link+0xab/0xc7
 [<c04aee45>] file_has_perm+0x89/0x91
 [<c0452ffb>] do_mmap_pgoff+0x57a/0x6e3
 [<f9168e5d>] kvm_vm_ioctl+0x0/0x585 [kvm]
 [<c0469247>] do_ioctl+0x1f/0x62
 [<c04694ce>] vfs_ioctl+0x244/0x256
 [<c046952c>] sys_ioctl+0x4c/0x64
 [<c0402c6c>] sysenter_past_esp+0x5d/0x81
 [<c05f0033>] xfrm_new_ae+0x5/0xbe