[GHC] #16294: Code generation corrupts writes to Addr#

[GHC]

#16294: Code generation corrupts writes to Addr#
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        Reporter:  andrewthad        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hsyl20):

 The good news is that it seems to me that it's only because `showHex`
 prints a single digit when you expect two. Can you try replacing it with
 `printf "%.2x"`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16294#comment:1>
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