[Haskell-cafe] New runtime crash, not sure what to make of it

[Simon Marlow]

On 07 December 2005 00:51, Joel Reymont wrote:

> Program compiled with -threaded on Mac OSX. Crash happens when
> waiting in select, I think.
> 
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
> [Switching to process 832 thread 0x2303]
> 0x0011ce20 in stg_enter_info ()
> (gdb) where
> #0  0x0011ce20 in stg_enter_info ()
> #1  0x00170e7c in StgRunIsImplementedInAssembler ()
> #2  0x001247a4 in schedule ()
> #3  0x00124468 in taskStart ()
> #4  0x0017f800 in startProcWrapper ()
> #5  0x9002b200 in _pthread_body ()
> 
> Haskell stack trace:
> 
> (gdb) p16 $r22
> 0x130a87c:      0x130a898
> 0x130a878:      0x13162c <selw_info>
> 0x130a874:      0x2a
> 0x130a870:      0x1305000
> 0x130a86c:      0x1b6aec <sdG0_info>
> 0x130a868:      0x130a884
> 0x130a864:      0x20e174 <GHCziIOBase_bindIO_closure>
> 0x130a860:      0x20e17c <GHCziIOBase_returnIO_closure>
> 0x130a85c:      0x1315b0 <selK_info>
> 0x130a858:      0x130a878
> 0x130a854:      0x130a86c
> 0x130a850:      0x20e174 <GHCziIOBase_bindIO_closure>
> 0x130a84c:      0x10002 <s7uY_dflt+38>
> 0x130a848:      0x1174c0 <stg_PAP_info>
> 0x130a844:      0x170114 <stg_stop_thread_info>
> 0x130a840:      0x170208 <stg_noforceIO_info>
> 0x130a83c:      0x118bd0 <stg_ap_v_info>

Strange.  This might be related to async exceptions, are you doing any
killThreads or throwTos?

Can you also generate a scheduler trace (+RTS -Ds) up to the crash
point?  And it might help to dump out the state of the current thread: 

 gdb> print MainCapability.r.rCurrentTSO

should do it.

Cheers,
	Simon