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

[GHC]

#14497: internal error: scavenge_one: strange object 19828
-------------------------------------+-------------------------------------
        Reporter:  Yuras             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       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:                    |
-------------------------------------+-------------------------------------

Comment (by RyanGlScott):

 It's worth noting that one must compile the program with `-O1` or `-O2` to
 trigger this panic (i.e., `-O0` isn't sufficient).

 Also, the panic itself only seems to appear on GHC 8.2.1 and HEAD. With
 8.0.2 and older, you can still run the program, but the two forked
 computations never appear to return.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14497#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler