[GHC] #14497: internal error: scavenge_one: strange object 19828

[GHC]

#14497: internal error: scavenge_one: strange object 19828
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        Reporter:  Yuras             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.2
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by Yuras):

 * cc: simonmar (added)
 * priority:  normal => high
 * milestone:   => 8.2.2


Comment:

 Then it is a regression, right? Please feel free to lower priority/change
 milestone if you disagree.

 I played with it a bit. Looks like it is not related neither to `ST`, no
 to concurrent evaluation of the same thunk. But resuming a thunk after
 blackholing is completely broken. Once I even got <<timeout>> exception
 thrown in each child thread. Disaster.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14497#comment:2>
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