My app crashes at (seemingly) random events. So, I wanted to add NSZombieEnabled to debug my iPhone application. I cloned my target and set its Info.plist to the same as the original target and set NSZombieEnabled to YES.
Once i run the app, it crashes with a stack trace of...
#0 0x3025db0c in ___forwarding___ ()
#1 0x30239db2 in __forwarding_prep_0___ ()
#2 0x304f5105 in NSPopAutoreleasePool ()
#3 0x308ee452 in _UIApplicationHandleEvent ()
#4 0x32031425 in PurpleEventCallback ()
#5 0x30235253 in CFRunLoopRunSpecific ()
#6 0x302343c8 in CFRunLoopRunInMode ()
#7 0x308e6209 in -[UIApplication _run] ()
#8 0x308eef81 in UIApplicationMain ()
#9 0x000023ef in main (argc=1, argv=0xbffff0bc) at /Users/tomen/Documents/MIB-Sprint4/main.m:26
This only happens when NSZombieEnabled is set to YES. If it is not set, the app just runs ( and crashes at different times )
I wanted to add breakpoints like "-[_NSZombie methodSignatureForSelector:]" and others, but they get deactivated during Debugging. I tried it both ways with "Load symbols lazily" turned on and off.
I also tried to set my ~/.gdbinit file to
fb -[NSException raise]
fb -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:]
fb -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:]
#define NSZombies
# this will give you help messages. Set to NO to turn them off.
set env MallocHelp=YES
# might also be set in launch arguments.
set env NSZombieEnabled=YES
set env NSDeallocateZombies=NO
set env MallocCheckHeapEach=100000
set env MallocCheckHeapStart=100000
set env MallocScribble=YES
set env MallocGuardEdges=YES
set env MallocCheckHeapAbort=1
set env CFZombie 5
fb -[_NSZombie init]
fb -[_NSZombie retainCount]
fb -[_NSZombie retain]
fb -[_NSZombie release]
fb -[_NSZombie autorelease]
fb -[_NSZombie methodSignatureForSelector:]
fb -[_NSZombie respondsToSelector:]
fb -[_NSZombie forwardInvocation:]
fb -[_NSZombie class]
fb -[_NSZombie dealloc]
fb szone_error
which yield this result in the console:
The Debugger has exited with status 0.
[Session started at 2009-09-08 13:48:40 +0200.]
Loading program into debugger…
GNU gdb 6.3.50-20050815 (Apple version gdb-966) (Tue Mar 10 02:43:13 UTC 2009)
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This GDB was configured as "i386-apple-darwin".warning: Unable to read symbols for "/System/Library/Frameworks/UIKit.framework/UIKit" (file not found).
warning: Unable to read symbols from "UIKit" (not yet mapped into memory).
warning: Unable to read symbols for "/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics" (file not found).
warning: Unable to read symbols from "CoreGraphics" (not yet mapped into memory).
Pending breakpoint 1 - "-[NSException raise]" resolved
Pending breakpoint 2 - "-[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:]" resolved
Pending breakpoint 3 - "-[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:]" resolved
Pending breakpoint 14 - "szone_error" resolved
Program loaded.
sharedlibrary apply-load-rules all
Attaching to program: `/Users/tomen/Library/Application Support/iPhone Simulator/User/Applications/F77D9D82-0B34-4B8D-9076-AE883A2714F4/MIB.app/MIB', process 279.
Re-enabling shared library breakpoint 1
Re-enabling shared library breakpoint 2
Re-enabling shared library breakpoint 3
Re-enabling shared library breakpoint 14
Re-enabling shared library breakpoint 16
Re-enabling shared library breakpoint 17
Re-enabling shared library breakpoint 18
warning: Couldn't raise load state for requested objfile: "/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation" for breakpoint 1/
warning: Couldn't raise load state for requested objfile: "/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation" for breakpoint 2/
warning: Couldn't raise load state for requested objfile: "/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation" for breakpoint 3/
Why do my breakpoints get deactivated?