[mercury-users] Crash on MacOS X

[Julien Fischer]

On Thu, 6 Nov 2008, Michael Day wrote:

> Hi,
>
> We're getting a crash in Prince on MacOS X that does not appear to be related 
> to anything we are doing, this is the backtrace:

What version of OS X is this?

> Program received signal EXC_BAD_ACCESS, Could not access memory.
> Reason: KERN_INVALID_ADDRESS at address: 0xbf7ffed8
> 0x001f65b3 in GC_clear_stack_inner ()
> (gdb) bt
> #0  0x001f65b3 in GC_clear_stack_inner ()
> Cannot access memory at address 0xbf7ffed8
> Cannot access memory at address 0xbf7ffedc
>
> Have there been any changes to garbage collection for MacOS X / x86 in hlc.gc 
> grade since 2007-08-16 that might solve this?

There have been no OS X related changes to the garbage collector since
we last upgraded it.  I believe that subsequent versions of Boehm GC
have fixed various OS X related issues (such as it not working with 64-bit
executables.)  We will (hopefully) be bumping the version used by
Mercury to 7.1 soon ... ish.

We (i.e. the Mercury team) have made a couple of local changes to the
version of the GC that is shipped with Mercury, but they are unlikely
to the cause.  See:

<http://www.mercury.csse.unimelb.edu.au/mailing-lists/mercury-reviews/mercury-reviews.200802/0004.html>
<http://www.mercury.csse.unimelb.edu.au/mailing-lists/mercury-reviews/mercury-reviews.200803/0012.html>

FWIW, we have been using the ROTD on OS 10.5.X / x86 with the G12 system and
have not encountered the above problem.

Cheers,
Julien.
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