Home/ Questions/Q 8581917
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-11T21:09:57+00:00

I’m getting the following EXC_BAD_INSTRUCTION exception when opening a window in Lion but the

  • 0

I’m getting the following EXC_BAD_INSTRUCTION exception when opening a window in Lion but the app appears to work fine in Mountain Lion. What can be the problem?

Process:         MyApp [595]
Path:            /Users/USER/Desktop/MyApp.app/Contents/MacOS/MyApp
Identifier:      com.example.MyApp
Version:         ??? (0.4)
Code Type:       X86-64 (Native)
Parent Process:  launchd [146]

Date/Time:       2012-09-25 11:09:14.498 +0200
OS Version:      Mac OS X 10.7.3 (11D50d)
Report Version:  9
Sleep/Wake UUID: BA4DA964-60E8-4DC6-B63C-99435074A41C

Interval Since Last Report:          2901634 sec
Crashes Since Last Report:           367
Per-App Interval Since Last Report:  129923 sec
Per-App Crashes Since Last Report:   8
Anonymous UUID:                      BFF6E121-730D-4729-B07F-DA8550F46E14

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000

Application Specific Information:
objc[595]: garbage collection is OFF
objc[595]: cannot form weak reference to instance (0x7fc091666650) of class MyViewController
Performing @selector(startPressed:) from sender NSButton 0x7fc09167d210

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                0x00007fff91496768 _objc_trap + 4
1   libobjc.A.dylib                0x00007fff914968aa _objc_fatal + 195
2   libobjc.A.dylib                0x00007fff914a24ad weak_register_no_lock + 346
3   libobjc.A.dylib                0x00007fff914a2a59 objc_storeWeak + 360
4   com.apple.CoreFoundation       0x00007fff8f29c75d -[NSObject performSelector:withObject:] + 61
5   com.apple.AppKit               0x00007fff94bb5392 -[NSNibOutletConnector establishConnection] + 405
6   com.apple.AppKit               0x00007fff94bb2a89 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 107
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Found it. The problem was that I had declared a delegate id property with weak and assigned a NSVieWcontroller to it.

    Apparently, if you want to support Lion and be safe you should never declare id properties as weak. From the Transitioning to ARC Release Notes:

    Note: In addition, in OS X v10.7, you cannot create weak references to
    instances of NSFontManager, NSFontPanel, NSImage, NSTableCellView,
    NSViewController, NSWindow, and NSWindowController. In addition, in OS
    X v10.7 no classes in the AV Foundation framework support weak
    references.

    Solution: use assign instead.

    @property (nonatomic, assign) IBOutlet id<MyDelegateProtocol> delegate;
    • 0