It seems that NSZombie can only be enabled in the instruments if the program is on the simulator.
I did NSZombie on Xcode and it tells me that this message sent to the deallocated instance happens in my video taking class, which is not supported on the simulator. Therefore I am unable to trace the instance which has been deallocated...
Is there any ideas in which i can find out which instance is being deallocated when I must use the device to make it happen? I'm using iOS5 with ARC..
Thank you so much in advance.
Guys this is really help full tool login install and use as per instruction this tool gives exact line no where there is error its been used in my organization http://www.crashlytics.com/
Related
Many crashes happened below the iOS9.3 (which means devices with iOS10 are OK)..
The crash logs seem to show that it's not a problem about API that can only be used below iOS 9.3 .
But I have no idea about the crash logs. ( I'm sorry ...for I just start to study iOS development for only 2 month )
Could you please help me analyze the crash logs ?
Really Thanks !
crash log 1
crash log 2
AXE_BAD_ACCESS - this is problem with memory. One of function tried to use variable which already released. I think you need to check use your TableView and cells for this table.
Also to find problem with memory you can try to use zombies
Used to have the similar strange crashes in my app. And only in production, when testing from TestFlight. Building on device with ios 9 caused no problems.
Maybe it sounds strange, but try to convert all images you use in app to images with included sRGB color profile. For me it helped.
I'm getting this error exc_bad_access code=1 address= xcodein my IOS app so I've tried to use the zombie tool like this :
Product->Profile->Zombies then I click on start recording (the red dot)
Also I've check the Enable Zombie Objects in
Product->Scheme->Edit scheme->Run->Diagnostics
The problem is when I'm using the zombie mode and I try to simulate the error, the error is not simulated, not detected. When I run my project in normal mode, debug, the error occurs and the app crash.
So what I've missed here ?
Note this is the first time I use the zombie tools. Thanks.
Update
Error :
The problem with NSZombie here is that it keeps objects alive instead of deallocating them, but turns them into special objects that complain as soon as you try to call a method on them.
However, if you have some code like a block that just tries to access an instance variable (without calling a method on that object), this will now succeed as the object's memory region is now still available.
If you haven't done so already, simply try running your code in the normal debugger without NSZombie as that should tell you where the crash happens in the stack trace.
I am unable to post images as I don't yet have 10 rep so my apologies if any of this is vague.
I'm writing an ARC application for Mac OS X and it throws an EXC_BAD_ACCESS error. In an attempt to track down the issue, I have enabled Zombie Objects under the 'Diagnostics' Tab.
I then startup Instruments (Zombies)
Finally I record and cause the app to crash and the error is generated. However, instead of getting any zombie indicators in instruments, I get an app problem report for my app that I'm profiling saying that my app 'quit unexpectedly'. No stack trace is produced for me to navigate and that problem report isn't of much use to me.
Could the EXC_BAD_ACCESS error be caused by something other than dereferencing a pointer to memory that has been released? Should I always expect to get Zombies in this case when there is an EXC_BAD_ACCESS error? If so then how can I see the zombie? What else do I need to configure to get the zombies?
Thanks
Could the EXC_BAD_ACCESS error be caused by something other than dereferencing a pointer to memory that has been released?
Yes. That error simply means that your program tried to dereference a pointer that refers to a location that your program isn't allowed to access. That could be because it points to an object that no longer exists, but it can also happen when you use a pointer without setting it to something valid in the first place, or when you incorrectly try to use a non-pointer value as a pointer.
Should I always expect to get Zombies in this case when there is an EXC_BAD_ACCESS error?
No, NSZombieEnabled only helps you find cases where you're trying to access a deallocated object. It won't help you with other cases that produce EXC_BAD_ACCESS.
You could try adding an exception breakpoint in Xcode.
Click the "Breakpoint navigator" tab in Xcode
Click the plus sign
Click "Add Exception Breakpoint"
I have crash in my project. I use MKMapView and sometimes it crashes in addAnnotation(s) method.
I get message from XCode that crash stating
method _insert(objc_object*, MKQuadTrieNode*, MKQuadTrie*)
Please, help me.
please see the below image
P.S. Crash is reproduced not always. It is reproduced after 100+ annotations, sometimes after 300 or 500+. This objects are returns from server and I check coordinate for it.
Enable Zombies in your project.
Press CMD+< and select Enable Zombie Object in Diagnostic tab.
Now your are able to see what's wrong.
hope this help.
I know there are MANY threads that discuss this issue and trust me, I have looked at each and every one of them but none of them solved my issue.
Anyway, in my app I am receiving a message sent to deallocated instance crash. The object address follows that message and I have tried to use instruments without any success.
What I would like to do is how do I properly debug and fix this issue with the latest Xcode (4.4.1). What I would like to know is which line the app crashed on. That way, I can just focus on that one object so I can make sure it is allocated.
Does anyone know how I can do this with the latest Xcode?
Thanks!
Enable zombie. It should tell you when your code try to send message to deallocated object instance. Problem is you are using a object after it has been released. It could be autoreleased object or object you explicitly released and using after etc. Below image is the screenshot from XCode when you do "Edit Scheme"
Setting an exception breakpoint can sometimes help to zero in on the specific line of your code that is causing a problem. This Apple doc shows you how.