[Haskell-cafe] GHC RTS bug: segmentation fault
dons at galois.com
Sun Apr 12 14:52:25 EDT 2009
The Haskell Cafe isn't the right forum for this.
Please file a bug report here:
> In a program I have experienced a segmentation fault;
> not only that but also:
> * tpp.c:63: __pthread_tpp_change_priority: Assertion `new_prio == -1 ||
> (new_prio >= __sched_fifo_min_prio && new_prio <=
> __sched_fifo_max_prio)' failed.
> * internal error: removeThreadFromQueue: not found
> (GHC version 6.8.2 for i386_unknown_linux)
> Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
> I have managed to write a program that reproduces the problem:
> Compile with: $ghc --make -threaded -O2 main.hs
> Execute with: $./main +RTS -A128M -s -c -N4 -RTS 5000000 500
> This should produce a segmentation fault (or one of the previous errors).
> I strongly suspect that the cause is an uncaught stack overflow.
> Executing the code with only 1 threads, there are no more problems.
> Increasing the thread stack size (-k1M), there are no more problems.
> If the problem is really an uncaught stack overflow, I'm rather sure
> that a more simple test can be written, to reproduce the problem.
> I'm on Linux Debian Etch i386; GHC 6.8.2.
> Some notes about the program:
> - when no segmentation fault occurs, the program requires about 1 GB of
> - there is no real parallelization, only 1 CPU is used
> - the mapReduce implementation is taken from Real World Haskell
> - the code is adapted from the code I'm using in a project
> Thanks Manlio Perillo
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