[GHC] #5188: Runtime error when allocating lots of memory

[GHC]

#5188: Runtime error when allocating lots of memory
---------------------------------+---------------------------
        Reporter:  knyblad       |            Owner:
            Type:  bug           |           Status:  new
        Priority:  low           |        Milestone:  7.6.2
       Component:  GHCi          |          Version:  6.12.1
      Resolution:                |         Keywords:
Operating System:  Linux         |     Architecture:  x86
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Changes (by rwbarton):

 * difficulty:   => Unknown


Comment:

 I was able to reproduce this (Linux 2.6.32-5-686, GHC 7.4.2).  Here is the
 offending mmap call, from strace:

 `mmap2(0x8d900000, 0, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
 0) = -1 EINVAL (Invalid argument)`

 ... which is certainly invalid (from the mmap man page: "EINVAL (since
 Linux 2.6.12) length was 0.")

 I'll try to figure out why it is mmapping 0 bytes.  Could be an integer
 overflow, when `size` is computed in `osGetMBlocks`...

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5188#comment:6>
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