[Haskell-cafe] Project postmortem

[Simon Marlow]

On 18 November 2005 14:42, Joel Reymont wrote:

> On Nov 18, 2005, at 1:55 PM, Simon Marlow wrote:
> 
>> You can get debugging output by compiling your program with -debug,
>> and then running it with some of the -D<something> options (use +RTS
>> -? for a list, +RTS -Ds is a good one to start with).
> 
> I'm still working on a repro case but here's what I get...
> 
> +RTS -Ds
> ...
> scheduler: checking for threads blocked on I/O
> sched: -->> running thread 1103 ThreadRunGHC ...
> sched: --<< thread 1103 (ThreadRunGHC) stopped: is blocked on an MVar
> all threads:
>          thread 1225 @ 0x1539000 is not blocked
>          thread 1224 @ 0x1506aa4 is not blocked
>          thread 1223 @ 0x15066a4 is not blocked
> ...
> scheduler: checking for threads blocked on I/O
> sched: -->> running thread 1107 ThreadRunGHC ...
> Segmentation fault
> 
> 1107 is not blocked in the list of all threads. What options should I
> try next?

That doesn't tell us much unfortunately.  Can you send a disassembly of
the block in which the crash happened?

Is it always the same block, BTW?  Does changing the heap size (+RTS
-H<size>) have any effect?

Cheers,
	Simon