[GHC] #13194: Concurrent modifications of package.cache are not safe

[GHC]

#13194: Concurrent modifications of package.cache are not safe
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        Reporter:  arybczak          |                Owner:  arybczak
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.2.1
       Component:  ghc-pkg           |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13354, #13375,   |  Differential Rev(s):  Phab:D3090
  #14017                             |
       Wiki Page:                    |
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Comment (by bgamari):

 As noted in #15313, comment:10 is broken on Windows, failing to ensure
 mutual exclusion under high load.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13194#comment:13>
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