#2972: ppc ghci segfaults at startup
------------------------+---------------------------------------------------
Reporter: cemeyer | Owner: erikd
Type: bug | Status: new
Priority: normal | Milestone: _|_
Component: GHCi | Version: 7.0.3
Keywords: | Testcase:
Blockedby: | Difficulty: Unknown
Os: Linux | Blocking:
Architecture: powerpc | Failure: GHCi crash
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Changes (by erikd):
* owner: => erikd
* failure: None/Unknown => GHCi crash
Comment:
If I compile ghc from git, but with the vector and dph packages absent
from the tree, I can get a ghci that segfaults.
I've been slowly debugging this in the little spare time I have and have
got to the stage where I found that it was segfault in function
`turnOffBuffering` (ghc/GhciMonad.hs) which looks like:
{{{
turnOffBuffering :: IO ()
turnOffBuffering
= do hdls <- mapM getHandle [stdin_ptr,stdout_ptr,stderr_ptr]
mapM_ (\h -> hSetBuffering h NoBuffering) hdls
}}}
Funnily enough, if replace the code in that function with just a `return
()` ghci no longer segfaults during startup and I actually get the ghci
`Prelude >` prompt.
At that prompt, some commands like the `:t` command work while any that
require actual computation result in a segfault again. Eg running under
gdb:
{{{
Prelude> :t 1 + 1
1 + 1 :: Num a => a
Prelude> 1 + 1
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xf71ff490 (LWP 5458)]
0xf51cad7c in ?? ()
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2972#comment:14>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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