#4850: Segfault when lots of blocked MVar messages
---------------------------------+------------------------------------------
Reporter: NeilMitchell | Owner:
Type: bug | Status: new
Priority: normal | Component: Runtime System
Version: 7.0.1 | Keywords:
Testcase: | Blockedby:
Os: Windows | Blocking:
Architecture: Unknown/Multiple | Failure: Runtime crash
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I reduced the original problem I started with in #4835 to the following
example, which spans 3 files. There is still further scope for reducing
the test case - I have stopped now it's standalone without any data file
or package dependencies. I have reproduced this bug on GHC 7.0.2-rc1.
The program does has some parallelism, and due to a bug in the parallel-io
library (since fixed) it causes lots of MVar blocked messages. This
program sometimes runs to completion, sometimes gives a blocked MVar, and
sometimes segfaults. I see the segfault > 50% of the time.
The program is compiled and run with:
{{{
ghc --make Main.hs -threaded && Main.exe
}}}
Line 82 of {{{Main.hs}}} does {{{getDirectoryContents "C:/Windows"}}}. It
seems to crash if I put file or directory operations here, but not if I
put sleep or pure computation there. This line can be changed to any
reasonably sized directory to get the same effects - there is nothing
specific to that folder.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4850>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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