" This is most likely a get_user or put_user faulting. Could you
" run gdb on your xen image and then check which function these addresses
" are in: disas 0xfc52e2a4 will tell you...
"
$ gdb xen/xen-syms
(gdb) disas 0xfc52e2a4
Dump of assembler code for function __copy_to_user_ll:
0xfc52e270 <__copy_to_user_ll+0>: sub $0x8,%esp
0xfc52e273 <__copy_to_user_ll+3>: mov 0x14(%esp),%ecx
0xfc52e277 <__copy_to_user_ll+7>: mov %esi,(%esp)
0xfc52e27a <__copy_to_user_ll+10>: mov 0x10(%esp),%esi
0xfc52e27e <__copy_to_user_ll+14>: mov %ecx,%edx
0xfc52e280 <__copy_to_user_ll+16>: mov %edi,0x4(%esp)
0xfc52e284 <__copy_to_user_ll+20>: mov 0xc(%esp),%edi
0xfc52e288 <__copy_to_user_ll+24>: cmp $0x7,%ecx
0xfc52e28b <__copy_to_user_ll+27>: jbe 0xfc52e2a4 <__copy_to_user_ll+52>
0xfc52e28d <__copy_to_user_ll+29>: mov %edi,%ecx
0xfc52e28f <__copy_to_user_ll+31>: neg %ecx
0xfc52e291 <__copy_to_user_ll+33>: and $0x7,%ecx
0xfc52e294 <__copy_to_user_ll+36>: sub %ecx,%edx
0xfc52e296 <__copy_to_user_ll+38>: repz movsb %ds:(%esi),%es:(%edi)
0xfc52e298 <__copy_to_user_ll+40>: mov %edx,%ecx
0xfc52e29a <__copy_to_user_ll+42>: shr $0x2,%ecx
0xfc52e29d <__copy_to_user_ll+45>: and $0x3,%edx
0xfc52e2a0 <__copy_to_user_ll+48>: repz movsl %ds:(%esi),%es:(%edi)
0xfc52e2a2 <__copy_to_user_ll+50>: mov %edx,%ecx
0xfc52e2a4 <__copy_to_user_ll+52>: repz movsb %ds:(%esi),%es:(%edi)
0xfc52e2a6 <__copy_to_user_ll+54>: mov (%esp),%esi
0xfc52e2a9 <__copy_to_user_ll+57>: mov %ecx,%eax
0xfc52e2ab <__copy_to_user_ll+59>: mov 0x4(%esp),%edi
0xfc52e2af <__copy_to_user_ll+63>: add $0x8,%esp
0xfc52e2b2 <__copy_to_user_ll+66>: ret
0xfc52e2b3 <__copy_to_user_ll+67>: lea 0x0(%esi),%esi
0xfc52e2b9 <__copy_to_user_ll+73>: lea 0x0(%edi),%edi
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