[ 1461.873885] BUG: Bad page map in process a.out  pte:12bfff127 pmd:cc6c0067
[ 1461.873891] page:ffffea0004afffc0 count:0 mapcount:-1 mapping:          (null) index:0xffffffffffffffff
[ 1461.873893] page flags: 0x2fc000000000c04(referenced|reserved|private)
[ 1461.873898] addr:00007fe1c3f6c000 vm_flags:140400fb anon_vma:          (null) mapping:ffff880114555be8 index:0
[ 1461.873899] vma->vm_ops->fault:           (null)
[ 1461.873911] vma->vm_file->f_op->mmap: gntalloc_mmap+0x0/0x1d0 [xen_gntalloc]
[ 1461.873914] CPU: 1 PID: 1010 Comm: a.out Tainted: G    B        3.10.3-1-ARCH #1
[ 1461.873916] Hardware name: Dell Inc. Precision WorkStation T3400  /0TP412, BIOS A05 05/09/2008
[ 1461.873917]  ffff8800cc407450 ffff8800bea35cc0 ffffffff814bd2df ffff8800bea35d08
[ 1461.873920]  ffffffff81146404 ffffea0004afffc0 ffff880114555be8 ffff8800cc6c0b60
[ 1461.873923]  ffffea0004afffc0 00007fe1c3f6d000 ffff8800bea35e30 00007fe1c3f6c000
[ 1461.873925] Call Trace:
[ 1461.873932]  [<ffffffff814bd2df>] dump_stack+0x19/0x1b
[ 1461.873937]  [<ffffffff81146404>] print_bad_pte+0x1b4/0x270
[ 1461.873939]  [<ffffffff811480c3>] unmap_single_vma+0x803/0x8d0
[ 1461.873944]  [<ffffffff8112e5d0>] ? SyS_readahead+0xb0/0xb0
[ 1461.873948]  [<ffffffff811492f9>] unmap_vmas+0x49/0x90
[ 1461.873951]  [<ffffffff8114ed79>] unmap_region+0x99/0x110
[ 1461.873954]  [<ffffffff8114f2f9>] ? vma_rb_erase+0x129/0x240
[ 1461.873956]  [<ffffffff81150f9a>] do_munmap+0x23a/0x3e0
[ 1461.873958]  [<ffffffff81151181>] vm_munmap+0x41/0x60
[ 1461.873961]  [<ffffffff811520c2>] SyS_munmap+0x22/0x30
[ 1461.873964]  [<ffffffff814ca75d>] system_call_fastpath+0x1a/0x1f