Re: compiling with -DSCM_DEBUG=1

[Andy Wingo <wingo@pobox.com>]

On Sun 06 Sep 2009 02:37, Ken Raeburn <raeburn@raeburn.org> writes:

> BTW, the bdw-gc branch with my patch and SCM_DEBUG==1 still fails tests
> on my Mac.
>
> In guardians.c, line 169, SCM_CAR is applied to a non-pair:
>
> Running popen.test
> Running ports.test
>
> scm_error_pair_access
> Non-pair accessed with SCM_C[AD]R: `ERROR: In procedure symbol->string:
> ERROR: Wrong type argument in position 1 (expecting symbol): #<guardian
> 124e300 (reachable: 15 unreachable: 1)>
> FAIL: check-guile
>
> I use a modified scm_error_pair_access() that prints the function's name
> (as seen above) and then sleeps a while, so I can attach gdb and  get
> this stack trace before letting it resume:
>
> #0  0x9487546e in __semwait_signal ()
> #1  0x948752ef in nanosleep$UNIX2003 ()
> #2  0x948cae71 in sleep$UNIX2003 ()
> #3  0x002ea943 in scm_error_pair_access (non_pair=0x11d9180) at ../../
> libguile/pairs.c:50
> #4  0x002c8e35 in finalize_guarded (ptr=0x11d91f0,
> finalizer_data=0x11d9188) at ../../libguile/guardians.c:169
> #5  0x000a0866 in GC_invoke_finalizers ()
> #6  0x000a2ce9 in GC_generic_malloc_many ()
> #7  0x000ab01a in GC_malloc ()
> #8  0x002ea987 in scm_cell [inlined] () at inline.h:66
> #9  0x002ea987 in scm_cons (x=0x9487546e, y=0x9487546e) at ../../
> libguile/pairs.c:66
> #10 0x002d0f5a in scm_make_list (n=0x4, init=0xb2920) at ../../
> libguile/list.c:121
> #11 0x002c8bbc in finalize_guarded (ptr=0x12615e8,
> finalizer_data=0x12615a0) at ../../libguile/guardians.c:125
> #12 0x000a0866 in GC_invoke_finalizers ()

Thanks for catching this bug. I'm sure Ludovic will look into it. We
should not release a 1.9.3 with bugs like this one.

A
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