[GHC] #10469: ghc crash on arm with -j2: internal error: scavenge: unimplemented/strange closure type

[GHC]

#10469: ghc crash on arm with -j2: internal error: scavenge: unimplemented/strange
closure type
-----------------------------------+---------------------------------------
              Reporter:  joeyhess  |             Owner:
                  Type:  bug       |            Status:  new
              Priority:  normal    |         Milestone:
             Component:  Compiler  |           Version:  7.10.1
              Keywords:            |  Operating System:  Linux
          Architecture:  arm       |   Type of failure:  Compile-time crash
             Test Case:            |        Blocked By:
              Blocking:            |   Related Tickets:
Differential Revisions:            |
-----------------------------------+---------------------------------------
 ghc: internal error: scavenge: unimplemented/strange closure type 0 @
 0xac103240
         (GHC version 7.10.1 for arm_unknown_linux)
         Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
     Aborted

 I can consistently get either this crash, or a segfault from ghc, building
 git-annex on an arm system. Seems about 50/50. In either case, it crashes
 either before ghc has printed out any "Compiling" lines, or within the
 first 1 or 2 files compiled.

 I got lucky and found out a way to avoid the crash.. cabal was passing -j2
 to ghc. If I remove the -j2, the build proceeds without a crash.

 The hardware is a CubieTruck arm board, with 2 gb of ram, and 1 cpu core,
 running Debian armel unstable, with kernel 3.4.103.

 I was able to use cabal to install the entire dependencies of git-annex,
 all the way up to yesod, which takes hours on this hardware, and all that
 built ok.. so I think the hardware is pretty stable, but still cannot
 really rule out a hardware problem.

 Happy to debug further, although this machine is a bit resource
 constrained to do things like building ghc on it.

 ghc 7.8.4 and 7.10.1 both crash the same way.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10469>
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