[GHC] #15508: concprog001 fails with various errors

[GHC]

#15508: concprog001 fails with various errors
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        Reporter:  osa1              |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15571            |  Differential Rev(s):  Phab:D5051
       Wiki Page:                    |  (reverted), Phab:D5165, Phab:D5178
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Comment (by osa1):

 Here's where we break the `rCCCS` register:

 {{{
 Thread 2 hit Hardware watchpoint 4: ((StgRegTable*)0xd35718)->rCCCS

 Old value = (struct CostCentreStack_ *) 0x4207528000
 New value = (struct CostCentreStack_ *) 0xd2df60 <CCS_SYSTEM>
 0x0000000000a376f8 in stg_returnToStackTop ()

 >>> bt
 #0  0x0000000000a376f8 in stg_returnToStackTop ()
 #1  0x0000000000000000 in ?? ()

 >>> call printClosure(0x4207528000)
 ghc-prim:GHC.Types.:(0x4207528071, 0x420752804a)
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15508#comment:28>
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