[GHC] #12537: Parallel cabal builds Segmentation Fault on PowerPC 64-bit

[GHC]

#12537: Parallel cabal builds Segmentation Fault on PowerPC 64-bit
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        Reporter:  michelmno         |                Owner:  trommler
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  powerpc64
 Type of failure:  Incorrect result  |            Test Case:
  at runtime                         |
      Blocked By:  12469             |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3984
       Wiki Page:                    |
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Comment (by michelmno):

 Replying to [comment:12 trommler]:
 > Replying to [comment:11 trommler]:
 > > I found an issue in the implementation of atomic read and atomic write
 operations in ghc-prim. I am working on a fix for powerpc64 and
 powerpc64le.
 > Phab:3984 improves the situation a lot on an old PowerMac. The segfault
 occurs only on every other run where before this patch I would see a
 segfault on almost all build attempts.
 >
 > The correctness issue I found in `libraries/ghc-prim/cbits/atomic.c`
 affects all platforms that are using the fallback functions
 `hs_atomicread*` and `hs_atomicwrite*`. I will create a separate ticket
 for that.

 What is the referenced Phab:3934 ? it is pointing to
 https://phabricator.haskell.org/3984  that is a "404 not found" page

 What is the reference to the separate ticket supposed to be created ?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12537#comment:13>
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