scheduleWaitThread looping

[Simon Marlow]

On 23/02/13 15:34, Gabor Greif wrote:
> I have finally have a cross compiler building, but encounter a new
> problem with a simple "Hello World" program not working.
>
> I get in GDB:
>
>
> Breakpoint 1, 0x102b4718 in startHeapProfTimer ()
> (gdb)
> Continuing.
>
> Breakpoint 3, 0x102b4708 in stopHeapProfTimer ()
> (gdb)
> Continuing.
>
> Breakpoint 1, 0x102b4718 in startHeapProfTimer ()
> (gdb) bt
> #0  0x102b4718 in startHeapProfTimer ()
> #1  0x1028d918 in scheduleWaitThread ()
> #2  0x102b5dd0 in rts_evalLazyIO ()
> #3  0x1028b674 in real_main ()
> #4  0x1028b79c in hs_main ()
> #5  0x100021dc in main ()
>
> The program seems to loop in scheduleWaitThread, toggling the
> HeapProfTimer endlessly and nothing useful happens. Any idea what
> could be wrong, or how I could tackle debugging this problem. The
> native build of the same program with same compiler version (HEAD)
> works well.
>
> Under what condition is scheduleWaitThread supposed to return?
>
> How can I enable source debugging for RTS files?

Compile your Haskell program with -debug.  That will link against the 
debugging version of the RTS that contains symbols.

Cheers,
	Simon


> I should note that this is a big-endian target (PPC) and I have seen
> trouble with certain fields being wrongly swapped in the past, but
> IIRC those resulted in crashes.
>
> Cheers and thanks,
>
>      Gabor
>
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