In my app, I ‘m getting this message logged now and again:

CoreAnimation: warning, deleted thread with uncommitted CATransaction; created 
by:
0   QuartzCore                          0x00007fff94e5c69a 
_ZN2CA11Transaction4pushEv + 318
1   QuartzCore                          0x00007fff94e5c19a 
_ZN2CA11Transaction15ensure_implicitEv + 276
2   QuartzCore                          0x00007fff94e62719 
_ZN2CA5Layer13thread_flags_EPNS_11TransactionE + 37
3   QuartzCore                          0x00007fff94e62668 
_ZN2CA5Layer4markEPNS_11TransactionEjj + 64
4   QuartzCore                          0x00007fff94e6412b 
_ZN2CA5Layer25set_needs_display_in_rectERK6CGRect + 333
5   QuartzCore                          0x00007fff94e63fdc -[CALayer 
setNeedsDisplayInRect:] + 25
6   AppKit                              0x00007fff9b0949ac -[_NSTiledLayer 
setNeedsDisplayInRect:] + 210
7   AppKit                              0x00007fff9b14e4b8 
-[_NSBackingLayerContents invalidateRect:] + 94
8   AppKit                              0x00007fff9ae79249 
_NSBackingLayerSetNeedsDisplayInRect + 160
9   AppKit                              0x00007fff9ae791a3 -[_NSBackingLayer 
setNeedsDisplayInRect:] + 61
10  AppKit                              0x00007fff9ae7998b -[NSView(NSInternal) 
_setLayerNeedsDisplayInViewRect:] + 606
11  AppKit                              0x00007fff9ae4788e 
NSViewSetNeedsDisplayInRect + 945
12  AppKit                              0x00007fff9ae474d6 -[NSView 
setNeedsDisplayInRect:] + 48
13  AppKit                              0x00007fff9b1f10e3 
-[_NSMirrorDocumentView documentViewNeedsDisplayInRect:] + 266
14  CoreFoundation                      0x00007fff91fbabbc 
__CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
15  CoreFoundation                      0x00007fff91fbab4f 
___CFXRegistrationPost_block_invoke + 63


This is what I get having turned on the CA_DEBUG_TRANSACTIONS, otherwise I get 
the first line without the stack trace.

It’s proving really awkward to track down - the problem is that a breakpoint 
on, say -[_NSMirrorDocumentView documentViewNeedsDisplayInRect:] is called all 
the time for many legitimate reasons, so I can’t pinpoint the one that leads to 
this message. It would be helpful if I coud see what the notification was that 
triggered this, but it’s NOT reported.

I’m guessing that this implies that a non-main thread has done something UI-ish 
that it shouldn’t, like posting a -setNeedsDisplay. The app does use plenty of 
threads, but I’ve been very careful to only do UI stuff on the main thread, so 
I’ve been unable to track it down simply by reviewing the code. Also, for all 
that, it seems benign - the app functions correctly AFAICS. I would like to get 
rid of the message though.

Can anyone suggest a way I can debug this with a more targeted approach?

—Graham



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