Re: new crash: TalkSoup startup

[Riccardo Mottola]

Hi,

Fred Kiefer wrote:
> Hi Riccardo,
>
> first off, the exception you are getting seems to be happening in the [NSLock 
> new] call and this is highly unlikely. Could you please verify that you are 
> using versions of gun and base that fit properly together? Or maybe you have 
> local changes to base?

I know it is, but that is why I did a make clean and recompiled with 
debug symbols. I have no local differences.
Perhaps something is already corrupt and this is why allocating a new 
lock fails.
Or by change, we are around a different aspect of our lock problem.
> Even for not document based applications GNUstep initialises an 
> NSDocumentController, if that gets used in the code. You have a valid point 
> here to question that. Maybe somebody should do a bit of research, wether Cocoa 
> does the same. At the moment we read the document class definitions inside the 
> NSDocumentController initialisation code and only after that we know whether we 
> have a document based application.

That would be worth knowing! I suppose getting a sharedDocument 
controller always returns one, so how can I know I have not one? I 
wonder about how to make a simple mac test app.


> In your specific case the initialisation of the NSDocumentController happens 
> because NSApplication cannot find a suitable responder for an action it is 
> trying to send. This looks like your UI is using an undefined message.

Perhaps identifying what action is useful, but I guess not having a 
responder shouldn't cause this sort of crash? At most an exception?

This doesn't look nice either:
#6  0x0000709d9520fa15 in -[NSApplication targetForAction:] (
    self=0x709d9f9d51c0, _cmd=0x709d9572e180 <_OBJC_SELECTOR_TABLE+5024>,
    aSelector=0x709d9e7ec380) at NSApplication.m:2316
2316      return [self _targetForAction: aSelector
(gdb) po NSStringFromSelector(aSelector)
Cannot access memory at address 0xffffffff9cf96830

perhaps the selector itself is bad? I went up one trace, printed out 
theAction and I get again a crash. I fear the memory is very comprimised.

(gdb) p theAction
$1 = (SEL) 0x7cc64e708f80
(gdb) po NSStringFromSelector(theAction)
Cannot access memory at address 0x4d72c3b0

I was able however to check out which menu it is:
(gdb) p item
$3 = (struct NSMenuItem *) 0x7cc64d3557b0
(gdb) po item
<NSMenuItem: 0x7cc64d3557b0>
(gdb) po [item title]
Cut

the application is starting up, perhaps things are not yet connected, I 
hope this is normal and is not the cause of the crash. This code used to 
work months ago and works on Mac.. so I wonder what changed.

Riccardo