Will enabling NSZombies get us anywhere on localizing the source? --russ
On Jul 21, 2014, at 3:19 PM, Christiaan Hofman <cmhof...@gmail.com> wrote:
>
> On Jul 21, 2014, at 23:04, Maxwell, Adam R wrote:
>
>>
>> On Jul 21, 2014, at 13:54, Russ McBride <russ...@gmail.com> wrote:
>>
>>>
>>> I knew someone would have some magic goggles somewhere ;-)
>>>
>>> Hmmm... "Someone probably used the wrong fd somewhere". Not sure about
>>> this. I'm assuming that the wrong fd is not being used by BD's code
>>> anywhere. Or is there possibly an fd-handling issue with BD entry
>>> attachments?
>>
>> I think my hypothesis fits this situation better. Suppose an object
>>
>> @interface NSConcreteFileHandle : NSObject
>> {
>> id _state;
>> int _fd;
>> ...
>> }
>> @end
>>
>> My suspicion is that BD has a memory corruption bug somewhere, where that
>> _fd file descriptor is being overwritten; something like a double free, or
>> extra autorelease can do this, where a few bytes of this object end up freed
>> or reused for some other object. Thus, when -[NSConcreteFileHandle dealloc]
>> is sent, it tries to do close(_fd) on a value that's been fully or partially
>> overwritten with other bits.
>>
>> This isn't the only crashing bug that's been reported which is really
>> difficult to reproduce. There's another one related to webview file icons.
>>
>>> If it's caused by what otherwise would have been un-noted data corruption,
>>> then corruption of what-- the .bib data file?
>>
>> Internal state of the program, which could include model data that is later
>> saved to disk. That's a worst-case scenario.
>>
>> Adam
>
>
>
> Right. But my main point is that the bug report is not very helpful (as in
> basically not helpful at all) in discovering where that problem may
> originate, as it does not show any context from BD at all. So unfortunately
> no magic goggle, because those goggles cannot see what's not reported.
>
> Christiaan
>
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