Looks like we have a bad src page when doing the memcpy():

memcpy:
        48 89 f8                mov    %rdi,%rax
        48 89 d1                mov    %rdx,%rcx
       <f3>a4                   rep movsb %ds:(%rsi),%es:(%rdi)                 
         //  e.g.  rep on *rdi++ = *rsi++
         c3                      retq

The GPF flags 0000 means page read and not found.  rsi is
0005080000000000 (src) and the rdi looks valid (ffff88008ba80156)

..and the memcpy from extent_io: was:

                kaddr = page_address(page);
                memcpy(dst, kaddr + offset, cur);

so it appears that the page kaddr from page is wrong somehow.

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https://bugs.launchpad.net/bugs/1384711

Title:
  btrfs oops on current 3.13

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