I have verified that this also happens with the newest version in Debian
and have reported it to the Maintainers of the package.

** Bug watch added: Debian Bug tracker #863460
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=863460

** Also affects: hashrat (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=863460
   Importance: Unknown
       Status: Unknown

** Description changed:

  Testing with an approximately 10 gigabyte file, I have found multi-
  megabyte changes reflect with gtkhash's sha512 but not with hashrats'
  sha512 or jh512.
  
  1.6.3 hashrat
  Drawing from 16.04 Xenial packages
+ 
+ To reproduce:
+ 
+ $ fallocate -l 10G sha512test
+ $ sha512sum sha512test 
+ 
0a9ed4396868700784918a83a595845d70e582eb0e625c48ace24f4ee94e705247e210339c5f5a55e597f00d2c3217b0c0797e1bfc617161e00de96eaee2d068
  sha512test
+ 
+ $ hashrat -sha512 sha512test 
+ 
hash='sha512:cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e'
 type='file' mode='100644' uid='1000' gid='1000' size='10737418240' 
mtime='1495871799' inode='12058626' path='sha512test'
+ 
+ $ echo 1 >> sha512test 
+ $ sha512sum sha512test 
+ 
ae6565b7a9761d6524262738fe252121393aa3fc4987794f5f10175407e212ca81cf04edca949b0316947342e85eca4902dbd445cd53b703c316e5b2979cc976
  sha512test
+ 
+ $ hashrat -sha512 sha512test 
+ 
hash='sha512:cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e'
 type='file' mode='100644' uid='1000' gid='1000' size='10737418242' 
mtime='1495871852' inode='12058626' path='sha512test'

** Changed in: hashrat (Ubuntu)
   Importance: Undecided => High

** Changed in: hashrat (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1669914

Title:
  sha512 hashing fails to reflect file changes

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