[GHC] #8406: Invalid object in isRetainer() or Segfault

[GHC]

#8406: Invalid object in isRetainer() or Segfault
-------------------------------------+-------------------------------------
        Reporter:  crockeea          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Runtime System    |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86_64
 Type of failure:  Runtime crash     |  (amd64)
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by JamesM):

 * status:  closed => new
 * version:  7.6.3 => 7.8.3
 * resolution:  worksforme =>


Old description:

> When compiling with
> -rtsopts -threaded -prof -fprof-auto -caf-all
>
> and running with
> -N4 -hr
>
> I get a "Segmentation fault" every time.
>
> If I run with -N4 -qg1 -hr, I either get a segfault or
> internal error: Invalid object in isRetainer(): 40
>
> When the segfault happens, it happens quickly. If the segfault doesn't
> happen, the program runs for about 5 seconds and I get "invalid object"
> error (always 40).
>
> Without -hr, I have never gotten a segfault.

New description:

 When compiling with
 -rtsopts -threaded -prof -fprof-auto -caf-all

 and running with
 -N4 -hr

 I get a "Segmentation fault" every time.

 If I run with -N4 -qg1 -hr, I either get a segfault or
 internal error: Invalid object in isRetainer(): 40

 When the segfault happens, it happens quickly. If the segfault doesn't
 happen, the program runs for about 5 seconds and I get "invalid object"
 error (always 40).

 Without -hr, I have never gotten a segfault.

 Edit (1/2015): This is still occurring under multiple threads in ghc
 7.8.3.
 GHC options: -Wall -prof -fprof-auto -threaded -rtsopts
 Runtime Options: -N4 -hr -L1000

--

Comment:

 This is still occurring for me. However, it is only problematic when using
 multiple threads changing from -N4 to -N1 removes the issue:

 par-simulator: internal error: Invalid object in isRetainer(): 39
     (GHC version 7.8.3 for x86_64_apple_darwin)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
 Abort trap: 6

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8406#comment:11>
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