Crash in garbage collector

[Daniel Berlin]

On Apr 20, 2004, at 9:40 AM, Jan Hoogerbrugge wrote:

>> Jan Hoogerbrugge wrote:
>>> I encounter segmentation faults in my port when the garbage 
>>> collector becomes
>>> active, so I am in trouble. Can somebody give me hints on how I can 
>>> debug this
>>> and what could be wrong.
>>
>> There is a --enable-checking=gcac configure option that will force a 
>> garbage collect on every entry into the gc routines.  This will 
>> usually force an error shortly after the mistake, making it easier to 
>> find the mistake.  There are also other checking options that might 
>> be useful. See the docs and the ggc code.
>
> Thanks.
>
> The --enable-checking=gcac option did not trigger the problem. After 
> that
> I figured out that there are two garbage collectors: page and zone. 
> When
> I configure gcc for zone the crashes disappear. Also, then I define
> COOKIE_CHECKING in ggc-zome.c, I see no crashes.
>  Any idea why I have
> crashes with page and not with zone (I tested this on a large number of
> files)?

They are completely different in almost every way, so no.
> If not, I will keep on using zone.
>
Zone has some know problems in relation with ggc_free that i just 
haven't gotten to fixing yet, so watch out.

--Dan