What's going wrong in this crash log - objective-c

Question

So i have this crash log from my application. I don't have much experience in reading such logs :( Could someone please help me?
Thanks
CrashLog:
Process: SoundCloud Downloader [15495]
Path: /Applications/SoundCloud Downloader.app/Contents/MacOS/SoundCloud Downloader
Identifier: com.BirdiCode.SoundCloud_Downloader
Version: 2.1.1 (b7)
Code Type: X86-64 (Native)
Parent Process: launchd [227]
Date/Time: 2012-01-08 15:16:21.614 +0100
OS Version: Mac OS X 10.7.2 (11C74)
Report Version: 9
Crashed Thread: 7
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: 0x000000000000000d, 0x0000000000000000
VM Regions Near 0:
-->
__TEXT 0000000100000000-0000000100053000 [ 332K] r-x/rwx SM=COW /Applications/SoundCloud Downloader.app/Contents/MacOS/SoundCloud Downloader
Application Specific Information:
objc_msgSend() selector name: _cfTypeID
objc[15495]: garbage collection is OFF
Thread 0:: Dispatch queue: com.apple.main-thread
0 libunwind.dylib 0x00007fff8bf97239 libunwind::CompactUnwinder_x86_64<libunwind::LocalAddressSpace>::stepWithCompactEncodingRBPFrame(unsigned int, unsigned long long, libunwind::LocalAddressSpace&, libunwind::Registers_x86_64&) + 1
1 libunwind.dylib 0x00007fff8bf971fd libunwind::CompactUnwinder_x86_64<libunwind::LocalAddressSpace>::stepWithCompactEncoding(unsigned int, unsigned long long, libunwind::LocalAddressSpace&, libunwind::Registers_x86_64&) + 37
2 libunwind.dylib 0x00007fff8bf97171 libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86_64>::step() + 69
3 libobjc.A.dylib 0x00007fff91442294 objc_addExceptionHandler + 82
4 com.apple.CoreFoundation 0x00007fff94d27d44 _CFDoExceptionOperation + 308
5 com.apple.AppKit 0x00007fff8ffd3309 _NSAppKitLock + 73
6 com.apple.AppKit 0x00007fff9009acb2 -[NSCGSContext _invalidate] + 57
7 com.apple.AppKit 0x00007fff9009ac53 -[NSCGSContext dealloc] + 27
8 com.apple.AppKit 0x00007fff9009ac31 -[NSWindowGraphicsContext dealloc] + 67
9 com.apple.AppKit 0x00007fff9009abe5 -[NSBitmapGraphicsContext dealloc] + 92
10 libobjc.A.dylib 0x00007fff9144003c (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 434
11 com.apple.CoreFoundation 0x00007fff94cc5f75 _CFAutoreleasePoolPop + 37
12 com.apple.Foundation 0x00007fff8a83c2a6 __NSFireDelayedPerform + 468
13 com.apple.CoreFoundation 0x00007fff94cecf84 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
14 com.apple.CoreFoundation 0x00007fff94cecad6 __CFRunLoopDoTimer + 534
15 com.apple.CoreFoundation 0x00007fff94ccd471 __CFRunLoopRun + 1617
16 com.apple.CoreFoundation 0x00007fff94cccae6 CFRunLoopRunSpecific + 230
17 com.apple.HIToolbox 0x00007fff8c02a3d3 RunCurrentEventLoopInMode + 277
18 com.apple.HIToolbox 0x00007fff8c03163d ReceiveNextEventCommon + 355
19 com.apple.HIToolbox 0x00007fff8c0314ca BlockUntilNextEventMatchingListInMode + 62
20 com.apple.AppKit 0x00007fff8ffd83f1 _DPSNextEvent + 659
21 com.apple.AppKit 0x00007fff8ffd7cf5 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 135
22 com.apple.AppKit 0x00007fff8ffd462d -[NSApplication run] + 470
23 com.apple.AppKit 0x00007fff9025380c NSApplicationMain + 867
24 com.BirdiCode.SoundCloud_Downloader 0x0000000100001e50 start + 52
Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x00007fff8c7c97e6 kevent + 10
1 libdispatch.dylib 0x00007fff8f5cb5be _dispatch_mgr_invoke + 923
2 libdispatch.dylib 0x00007fff8f5ca14e _dispatch_mgr_thread + 54
Thread 2:: com.apple.NSURLConnectionLoader
0 libsystem_kernel.dylib 0x00007fff8c7c767a mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff8c7c6d71 mach_msg + 73
2 com.apple.CoreFoundation 0x00007fff94cc4b6c __CFRunLoopServiceMachPort + 188
3 com.apple.CoreFoundation 0x00007fff94ccd2d4 __CFRunLoopRun + 1204
4 com.apple.CoreFoundation 0x00007fff94cccae6 CFRunLoopRunSpecific + 230
5 com.apple.Foundation 0x00007fff8a8960ab +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 335
6 com.apple.Foundation 0x00007fff8a88a7fe -[NSThread main] + 68
7 com.apple.Foundation 0x00007fff8a88a776 __NSThread__main__ + 1575
8 libsystem_c.dylib 0x00007fff8a60e8bf _pthread_start + 335
9 libsystem_c.dylib 0x00007fff8a611b75 thread_start + 13
Thread 3:: com.apple.CFSocket.private
0 libsystem_kernel.dylib 0x00007fff8c7c8df2 __select + 10
1 com.apple.CoreFoundation 0x00007fff94d15f9b __CFSocketManager + 1355
2 libsystem_c.dylib 0x00007fff8a60e8bf _pthread_start + 335
3 libsystem_c.dylib 0x00007fff8a611b75 thread_start + 13
Thread 4:
0 libsystem_kernel.dylib 0x00007fff8c7c9192 __workq_kernreturn + 10
1 libsystem_c.dylib 0x00007fff8a610594 _pthread_wqthread + 758
2 libsystem_c.dylib 0x00007fff8a611b85 start_wqthread + 13
Thread 5:
0 libsystem_kernel.dylib 0x00007fff8c7c9192 __workq_kernreturn + 10
1 libsystem_c.dylib 0x00007fff8a610594 _pthread_wqthread + 758
2 libsystem_c.dylib 0x00007fff8a611b85 start_wqthread + 13
Thread 6:
0 libsystem_kernel.dylib 0x00007fff8c7c9192 __workq_kernreturn + 10
1 libsystem_c.dylib 0x00007fff8a610594 _pthread_wqthread + 758
2 libsystem_c.dylib 0x00007fff8a611b85 start_wqthread + 13
Thread 7 Crashed:
0 libobjc.A.dylib 0x00007fff9143ae90 objc_msgSend + 16
1 com.apple.CoreFoundation 0x00007fff94ca6ae0 CFGetTypeID + 240
2 com.apple.CoreGraphics 0x00007fff8b1a31f0 CGSReleaseRegion + 23
3 com.apple.AppKit 0x00007fff9001ac0d -[NSRegion dealloc] + 33
4 com.apple.AppKit 0x00007fff900a23fc +[_NSAutomaticFocusRing showForView:] + 2655
5 com.apple.AppKit 0x00007fff9001acbe -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 136
6 com.apple.AppKit 0x00007fff9001493e -[NSView displayIfNeeded] + 1676
7 com.apple.AppKit 0x00007fff9016ca18 -[NSWindow setFrame:display:animate:] + 1320
8 com.BirdiCode.SoundCloud_Downloader 0x0000000100015682 -[SoundCloud_DownloaderAppDelegate expandTheWindowForDownload] + 654
9 com.BirdiCode.SoundCloud_Downloader 0x0000000100016374 -[SoundCloud_DownloaderAppDelegate addToDownloadsQue:title:artist:buy:] + 2900
10 com.BirdiCode.SoundCloud_Downloader 0x00000001000126f9 -[SoundCloud_DownloaderAppDelegate prepareForDownloadThread:] + 727
11 com.BirdiCode.SoundCloud_Downloader 0x00000001000129c6 -[SoundCloud_DownloaderAppDelegate prepareThread1] + 70
12 com.apple.Foundation 0x00007fff8a88a7fe -[NSThread main] + 68
13 com.apple.Foundation 0x00007fff8a88a776 __NSThread__main__ + 1575
14 libsystem_c.dylib 0x00007fff8a60e8bf _pthread_start + 335
15 libsystem_c.dylib 0x00007fff8a611b75 thread_start + 13
Thread 8:
0 libsystem_kernel.dylib 0x00007fff8c7c9192 __workq_kernreturn + 10
1 libsystem_c.dylib 0x00007fff8a610594 _pthread_wqthread + 758
2 libsystem_c.dylib 0x00007fff8a611b85 start_wqthread + 13
Thread 9:
0 libsystem_kernel.dylib 0x00007fff8c7c767a mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff8c7c6d71 mach_msg + 73
2 com.apple.CoreFoundation 0x00007fff94cc4b6c __CFRunLoopServiceMachPort + 188
3 com.apple.CoreFoundation 0x00007fff94ccd2d4 __CFRunLoopRun + 1204
4 com.apple.CoreFoundation 0x00007fff94cccae6 CFRunLoopRunSpecific + 230
5 com.apple.Foundation 0x00007fff8a83c04f -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 267
6 com.BirdiCode.SoundCloud_Downloader 0x0000000100029601 -[ASIHTTPRequest startSynchronous] + 229
7 com.BirdiCode.SoundCloud_Downloader 0x0000000100013849 -[SoundCloud_DownloaderAppDelegate downloadThisFromThread:] + 952
8 com.BirdiCode.SoundCloud_Downloader 0x0000000100014db2 -[SoundCloud_DownloaderAppDelegate downloadT1] + 70
9 com.apple.Foundation 0x00007fff8a88a7fe -[NSThread main] + 68
10 com.apple.Foundation 0x00007fff8a88a776 __NSThread__main__ + 1575
11 libsystem_c.dylib 0x00007fff8a60e8bf _pthread_start + 335
12 libsystem_c.dylib 0x00007fff8a611b75 thread_start + 13
Thread 10:
0 libsystem_kernel.dylib 0x00007fff8c7c767a mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff8c7c6d71 mach_msg + 73
2 com.apple.CoreFoundation 0x00007fff94cc4b6c __CFRunLoopServiceMachPort + 188
3 com.apple.CoreFoundation 0x00007fff94ccd2d4 __CFRunLoopRun + 1204
4 com.apple.CoreFoundation 0x00007fff94cccae6 CFRunLoopRunSpecific + 230
5 com.apple.Foundation 0x00007fff8a83c04f -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 267
6 com.BirdiCode.SoundCloud_Downloader 0x0000000100029601 -[ASIHTTPRequest startSynchronous] + 229
7 com.BirdiCode.SoundCloud_Downloader 0x00000001000139c3 -[SoundCloud_DownloaderAppDelegate downloadThisFromThread:] + 1330
8 com.BirdiCode.SoundCloud_Downloader 0x0000000100014ccb -[SoundCloud_DownloaderAppDelegate downloadT2] + 70
9 com.apple.Foundation 0x00007fff8a88a7fe -[NSThread main] + 68
10 com.apple.Foundation 0x00007fff8a88a776 __NSThread__main__ + 1575
11 libsystem_c.dylib 0x00007fff8a60e8bf _pthread_start + 335
12 libsystem_c.dylib 0x00007fff8a611b75 thread_start + 13
Thread 11:
0 libsystem_kernel.dylib 0x00007fff8c7c767a mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff8c7c6d71 mach_msg + 73
2 com.apple.CoreFoundation 0x00007fff94cc4b6c __CFRunLoopServiceMachPort + 188
3 com.apple.CoreFoundation 0x00007fff94ccd2d4 __CFRunLoopRun + 1204
4 com.apple.CoreFoundation 0x00007fff94cccae6 CFRunLoopRunSpecific + 230
5 com.apple.Foundation 0x00007fff8a83c04f -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 267
6 com.BirdiCode.SoundCloud_Downloader 0x0000000100029601 -[ASIHTTPRequest startSynchronous] + 229
7 com.BirdiCode.SoundCloud_Downloader 0x0000000100013b3d -[SoundCloud_DownloaderAppDelegate downloadThisFromThread:] + 1708
8 com.BirdiCode.SoundCloud_Downloader 0x0000000100014be4 -[SoundCloud_DownloaderAppDelegate downloadT3] + 70
9 com.apple.Foundation 0x00007fff8a88a7fe -[NSThread main] + 68
10 com.apple.Foundation 0x00007fff8a88a776 __NSThread__main__ + 1575
11 libsystem_c.dylib 0x00007fff8a60e8bf _pthread_start + 335
12 libsystem_c.dylib 0x00007fff8a611b75 thread_start + 13
Thread 7 crashed with X86 Thread State (64-bit):
rax: 0x00007fff7a7a5b00 rbx: 0x0000000101aad400 rcx: 0xf000000000000000 rdx: 0x00007fff7a7d56c0
rdi: 0x0000000101aad400 rsi: 0x00007fff9089fb17 rbp: 0x000000010a1da1d0 rsp: 0x000000010a1da1b0
r8: 0x0000000000000080 r9: 0x0000000000000180 r10: 0x000000010035ec80 r11: 0xf000000000000000
r12: 0x000000010a5263b0 r13: 0x00000000000000e0 r14: 0x000000010a527250 r15: 0x000000010a526500
rip: 0x00007fff9143ae90 rfl: 0x0000000000010246 cr2: 0x000000010a527000
Logical CPU: 0
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 7
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 167922
thread_create: 2
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=162.9M resident=115.1M(71%) swapped_out_or_unallocated=47.8M(29%)
Writable regions: Total=122.9M written=12.7M(10%) resident=21.4M(17%) swapped_out=860K(1%) unallocated=101.4M(83%)
REGION TYPE VIRTUAL
=========== =======
CG backing stores 1496K
CG image 1872K
CG raster data 1988K
CG shared images 3512K
CoreGraphics 16K
CoreImage 4K
CoreServices 2888K
MALLOC 86.6M
MALLOC guard page 32K
Memory tag=240 4K
Memory tag=242 12K
Memory tag=243 12K
Memory tag=251 8K
OpenCL 8K
STACK GUARD 56.0M
Stack 13.1M
VM_ALLOCATE 16.2M
__CI_BITMAP 80K
__DATA 15.3M
__IMAGE 1256K
__LINKEDIT 48.2M
__RC_CAMERAS 236K
__TEXT 114.7M
__UNICODE 544K
mapped file 45.3M
shared memory 17.7M
=========== =======
TOTAL 426.9M
Also, ist there a book or some website where i could learn how to read crash logs?
Update:
Here is the code for expandWindowForDownload
- (void)expandTheWindowForDownload
{
// Get the window size
NSRect frame = [window frame];
frame.origin.y += frame.size.height - 201;
frame.size.height = 201;
// Apply it
[window setFrame:frame display:YES animate:YES];
}

Answer 1

Here are the things I normally look for:
Exception type
This normally helps you to understand what the basic problem is. In your case, the exception type is EXC_BAD_ACCESS:
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
As Google, Stack Overflow or Apple will tell you, these kind of errors occur when you try to access an object after you've released it. (One common root cause of this is if you "over-release" an object - i.e. you call the release method on an object more often than it had been retained.)
Xcode can often find the source of these kind of errors when you run "Analyze" from the Product menu. (In Xcode 3 it's "Build and Analyze" from the Build menu if I recall correctly.) So give that a try, it might save you some time. Otherwise...
Crashed Thread
You'll find this at the top of the crash log, right above the exception type. In your case you've got:
Crashed Thread: 7
This allows you to discard most of the content of the crash log and concentrate on just the thread that caused the crash. So the bit you're interested in is this:
Thread 7 Crashed:
0 libobjc.A.dylib 0x00007fff9143ae90 objc_msgSend + 16
1 com.apple.CoreFoundation 0x00007fff94ca6ae0 CFGetTypeID + 240
2 com.apple.CoreGraphics 0x00007fff8b1a31f0 CGSReleaseRegion + 23
3 com.apple.AppKit 0x00007fff9001ac0d -[NSRegion dealloc] + 33
4 com.apple.AppKit 0x00007fff900a23fc +[_NSAutomaticFocusRing showForView:] + 2655
5 com.apple.AppKit 0x00007fff9001acbe -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 136
6 com.apple.AppKit 0x00007fff9001493e -[NSView displayIfNeeded] + 1676
7 com.apple.AppKit 0x00007fff9016ca18 -[NSWindow setFrame:display:animate:] + 1320
8 com.BirdiCode.SoundCloud_Downloader 0x0000000100015682 -[SoundCloud_DownloaderAppDelegate expandTheWindowForDownload] + 654
9 com.BirdiCode.SoundCloud_Downloader 0x0000000100016374 -[SoundCloud_DownloaderAppDelegate addToDownloadsQue:title:artist:buy:] + 2900
10 com.BirdiCode.SoundCloud_Downloader 0x00000001000126f9 -[SoundCloud_DownloaderAppDelegate prepareForDownloadThread:] + 727
11 com.BirdiCode.SoundCloud_Downloader 0x00000001000129c6 -[SoundCloud_DownloaderAppDelegate prepareThread1] + 70
12 com.apple.Foundation 0x00007fff8a88a7fe -[NSThread main] + 68
13 com.apple.Foundation 0x00007fff8a88a776 __NSThread__main__ + 1575
14 libsystem_c.dylib 0x00007fff8a60e8bf _pthread_start + 335
15 libsystem_c.dylib 0x00007fff8a611b75 thread_start + 13
Now you can work down this stack trace from top to bottom until you reach the first call from your own code. (In theory it's possible that the crash is being caused by an error in Apple's code, but in practice it's almost always our code, not theirs.)
So for you the line of code where things have started to go wrong is:
8 com.BirdiCode.SoundCloud_Downloader 0x0000000100015682 -[SoundCloud_DownloaderAppDelegate expandTheWindowForDownload] + 654
Have a look through the expandTheWindowForDownload method and see if you can spot where you're accessing a released object. If you can't spot it, post the code for that method here and we should be able to find the answer and help you understand what's gone wrong.

Answer 2

Ok, so for anyone viewing this I found the solution to the problem.
It seems to be if you resize the window and the user has "Focused" on a NSTextField while the window is resizing it may cause the crash. This happens on all text input except the NSForm.
This problem occurs on 10.7.2 & 10.7.3. I haven't tried it on any other versions of mac os x.
To solve this problem I just called [textField setEditable:NO]; before and [textField setEditable:YES]; after the window resizing call.
Anyway, thanks for helping!