[GHC] #11978: running a profiled build of shake test suite with rts args +RTS -hb -N10 triggers SIGSEGV

[GHC]

#11978: running a profiled build of shake test suite with rts args  +RTS -hb -N10
triggers SIGSEGV
---------------------------------+----------------------------------------
        Reporter:  carter        |                Owner:
            Type:  bug           |               Status:  new
        Priority:  highest       |            Milestone:
       Component:  Compiler      |              Version:  8.0.1
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:  #4820         |  Differential Rev(s):
       Wiki Page:                |
---------------------------------+----------------------------------------

Comment (by erikd):

 Recreated @carter's original test running `shake`'s test suite. With my
 proposed fix applied, I still get a segfault.

 Running under `gdb` provides the following backtrace:

 {{{
 Program received signal SIGSEGV, Segmentation fault.
 [Switching to Thread 0x7fffbb7fe700 (LWP 9743)]
 overwritingClosure (p=0x20010d8e0) at
 includes/rts/storage/ClosureMacros.h:535
 535             ((StgThunk *)(p))->payload[i] = 0;
 (gdb) bt
 #0  overwritingClosure (p=0x20010d8e0) at
 includes/rts/storage/ClosureMacros.h:535
 #1  doneWithMsgThrowTo (m=0x20010d8e0) at rts/Messages.h:25
 #2  executeMessage (cap=cap at entry=0x1496740, m=0x20010d8e0) at
 rts/Messages.c:104
 #3  0x0000000000f47834 in scheduleProcessInbox (pcap=<optimized out>) at
 rts/Schedule.c:1005
 #4  scheduleFindWork (pcap=<optimized out>) at rts/Schedule.c:616
 #5  schedule (initialCapability=<optimized out>,
 task=task at entry=0x7fff88000910)
     at rts/Schedule.c:274
 #6  0x0000000000f490dc in scheduleWorker (cap=<optimized out>,
 task=0x7fff88000910)
     at rts/Schedule.c:2382
 #7  0x00007ffff75b6454 in start_thread (arg=0x7fffbb7fe700) at
 pthread_create.c:334
 #8  0x00007ffff6d72eed in clone () at
 ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 (gdb) print i
 $1 = 910560
 (gdb) print p
 $2 = (StgClosure *) 0x20010d8e0
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11978#comment:8>
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