Since macOS Catalina Xcode app is crashing every night with CVCGDisplayLink exception
I have a macOS app with a GUI which runs 24/7 and as of last week worked flawlessly. Three days ago I updated my Mac mini late 2012 to macOS Catalina. I started my app again and it worked. The next morning I encountered an EXC_BAD_ACCESS error which crashed the app (see below for more information). Restarted the app, error reappeared next morning and this morning, too.
Background: I don't expect hardware to have any influence since it was never any issue but still: I have a display attached, which through a connected power plug gets turned off at night and turned on again in the morning.
Here's the error:
CVDisplayLink (989): EXC_BAD_ACCESS (code=1, address=0x40)
In the log before the crash this message appears roughly 50 times, not sure if it has anything to do with the crash itself:
CVCGDisplayLink::setCurrentDisplay didn't find a valid display - falling back to 60Hz
and
Could not start the display link: -6661
I attached a screenshot with the threads in question and the last commands. I don't find any connection to my code... The app crashes always at the exact same location (I think).
Any help is highly appreciated! My next step is to leave the display on during the night and see if the error reappears. Even if no, that's no solution as I want the display to sleep during the night and other times...
Here's a crash report:
Process: FIPS [29505]
Path: /Applications/FIPS.app/Contents/MacOS/FIPS
Identifier: xxx.xxxxxxxx.FIPS
Version: 1.0 (1)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: FIPS [29505]
User ID: 502
Date/Time: 2020-03-29 23:28:13.101 +0200
OS Version: Mac OS X 10.15.4 (19E266)
Report Version: 12
Anonymous UUID: 571E7574-0586-B5D1-F56D-FDC0D2261660
Time Awake Since Boot: 86000 seconds
System Integrity Protection: enabled
Crashed Thread: 17 CVDisplayLink
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000040
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [29505]
VM Regions Near 0x40:
-->
__TEXT 000000010510d000-000000010517f000 [ 456K] r-x/r-x SM=COW /Applications/FIPS.app/Contents/MacOS/FIPS
Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff6f55fdfa mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff6f560170 mach_msg + 60
2 com.apple.SkyLight 0x00007fff646fa418 SLSCopyManagedDisplayForSpace + 225
3 com.apple.AppKit 0x00007fff329ccc68 _NSDisplayUUIDForSpace + 42
4 com.apple.AppKit 0x00007fff33137f50 -[_NSFullScreenSpace screen] + 47
5 com.apple.AppKit 0x00007fff326a4b7e +[_NSFullScreenSpace visibleFullScreenSpaceOnScreen:] + 312
6 com.apple.AppKit 0x00007fff326a49fa -[NSScreen _menuBarHeight] + 76
7 com.apple.AppKit 0x00007fff326a4998 -[NSScreen _layoutFrame] + 71
8 com.apple.AppKit 0x00007fff326e314a -[NSScreen visibleFrame] + 44
9 com.apple.AppKit 0x00007fff326e23b6 -[NSWindow(NSWindowResizing) _resizableEdgesForGrowing:shrinking:] + 587
10 com.apple.AppKit 0x00007fff3287100b -[NSWindow(NSWindowResizing) _resizeDirectionForMouseLocation:] + 225
11 com.apple.AppKit 0x00007fff32870e86 -[NSWindow(NSWindowResizing) _edgeResizingCursorUpdate:atLocation:] + 227
12 com.apple.AppKit 0x00007fff32870a22 -[NSWindow(NSCursorRects) _setCursorForMouseLocation:] + 179
13 com.apple.AppKit 0x00007fff32781599 _NSWindowDisplayCycleUpdateStructuralRegions + 571
14 com.apple.AppKit 0x00007fff3277bcc4 __NSWindowGetDisplayCycleObserverForUpdateStructuralRegions_block_invoke + 420
15 com.apple.AppKit 0x00007fff32773e52 NSDisplayCycleObserverInvoke + 155
16 com.apple.AppKit 0x00007fff327739dc NSDisplayCycleFlush + 937
17 com.apple.QuartzCore 0x00007fff40f07454 CA::Transaction::run_commit_handlers(CATransactionPhase) + 106
18 com.apple.QuartzCore 0x00007fff40f06166 CA::Transaction::commit() + 230
19 com.apple.AppKit 0x00007fff3282fa01 __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke + 266
20 com.apple.AppKit 0x00007fff32f4e950 ___NSRunLoopObserverCreateWithHandler_block_invoke + 41
21 com.apple.CoreFoundation 0x00007fff3542402c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
22 com.apple.CoreFoundation 0x00007fff35423f5c __CFRunLoopDoObservers + 457
23 com.apple.CoreFoundation 0x00007fff354234f4 __CFRunLoopRun + 884
24 com.apple.CoreFoundation 0x00007fff35422b23 CFRunLoopRunSpecific + 466
25 com.apple.HIToolbox 0x00007fff34044abd RunCurrentEventLoopInMode + 292
26 com.apple.HIToolbox 0x00007fff340447d5 ReceiveNextEventCommon + 584
27 com.apple.HIToolbox 0x00007fff34044579 _BlockUntilNextEventMatchingListInModeWithFilter + 64
28 com.apple.AppKit 0x00007fff3268fc99 _DPSNextEvent + 883
29 com.apple.AppKit 0x00007fff3268e4e0 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
30 com.apple.AppKit 0x00007fff326801ee -[NSApplication run] + 658
31 com.apple.AppKit 0x00007fff32651ff6 NSApplicationMain + 777
32 xxx.xxxxxxx.FIPS 0x000000010510fb49 main + 9 (AppDelegate.swift:12)
33 libdyld.dylib 0x00007fff6f41ecc9 start + 1
Thread 1:: JavaScriptCore bmalloc scavenger
0 libsystem_kernel.dylib 0x00007fff6f562882 __psynch_cvwait + 10
1 libsystem_pthread.dylib 0x00007fff6f627425 _pthread_cond_wait + 698
2 libc++.1.dylib 0x00007fff6c6fa623 std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
3 com.apple.JavaScriptCore 0x00007fff39c42a75 bmalloc::Scavenger::threadRunLoop() + 741
4 com.apple.JavaScriptCore 0x00007fff39c42489 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 9
5 com.apple.JavaScriptCore 0x00007fff39c44b67 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*) + 39
6 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
7 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 2:: com.apple.NSURLConnectionLoader
0 libsystem_kernel.dylib 0x00007fff6f55fdfa mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff6f560170 mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff35424bf7 __CFRunLoopServiceMachPort + 247
3 com.apple.CoreFoundation 0x00007fff354236b1 __CFRunLoopRun + 1329
4 com.apple.CoreFoundation 0x00007fff35422b23 CFRunLoopRunSpecific + 466
5 com.apple.CFNetwork 0x00007fff33c5009a 0x7fff33c06000 + 303258
6 com.apple.Foundation 0x00007fff37ad1882 __NSThread__start__ + 1064
7 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
8 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 3:: com.apple.NSEventThread
0 libsystem_kernel.dylib 0x00007fff6f55fdfa mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff6f560170 mach_msg + 60
2 com.apple.SkyLight 0x00007fff645a58d7 CGSSnarfAndDispatchDatagrams + 237
3 com.apple.SkyLight 0x00007fff647d55a5 SLSGetNextEventRecordInternal + 83
4 com.apple.SkyLight 0x00007fff64673fbe SLEventCreateNextEvent + 136
5 com.apple.HIToolbox 0x00007fff34051da6 PullEventsFromWindowServerOnConnection(unsigned int, unsigned char, __CFMachPortBoost*) + 268
6 com.apple.HIToolbox 0x00007fff34051c72 MessageHandler(__CFMachPort*, void*, long, void*) + 48
7 com.apple.CoreFoundation 0x00007fff35453983 __CFMachPortPerform + 250
8 com.apple.CoreFoundation 0x00007fff35425003 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
9 com.apple.CoreFoundation 0x00007fff35424f52 __CFRunLoopDoSource1 + 541
10 com.apple.CoreFoundation 0x00007fff35423a6c __CFRunLoopRun + 2284
11 com.apple.CoreFoundation 0x00007fff35422b23 CFRunLoopRunSpecific + 466
12 com.apple.AppKit 0x00007fff328315b4 _NSEventThread + 132
13 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
14 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 4:: com.apple.coreanimation.render-server
0 libsystem_kernel.dylib 0x00007fff6f55fdfa mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff6f560170 mach_msg + 60
2 com.apple.QuartzCore 0x00007fff40f4f1c2 CA::Render::Server::server_thread(void*) + 496
3 com.apple.QuartzCore 0x00007fff40f4efc3 thread_fun(void*) + 25
4 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
5 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 5:: com.apple.coreaudio.AQClient
0 libsystem_kernel.dylib 0x00007fff6f55fdfa mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff6f560170 mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff35424bf7 __CFRunLoopServiceMachPort + 247
3 com.apple.CoreFoundation 0x00007fff354236b1 __CFRunLoopRun + 1329
4 com.apple.CoreFoundation 0x00007fff35422b23 CFRunLoopRunSpecific + 466
5 com.apple.audio.toolbox.AudioToolbox 0x00007fff337a44cc GenericRunLoopThread::Entry(void*) + 166
6 libAudioToolboxUtility.dylib 0x00007fff6bda96c9 CAPThread::Entry(CAPThread*) + 77
7 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
8 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 6:
0 libsystem_kernel.dylib 0x00007fff6f55fe36 semaphore_wait_trap + 10
1 com.apple.audio.caulk 0x00007fff68f6ab16 caulk::mach::semaphore::wait() + 16
2 com.apple.audio.caulk 0x00007fff68f6a9b2 caulk::semaphore::timed_wait(double) + 106
3 com.apple.audio.caulk 0x00007fff68f6a7c4 caulk::concurrent::details::worker_thread::run() + 30
4 com.apple.audio.caulk 0x00007fff68f6a1e4 void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::*)(), std::__1::tuple<caulk::concurrent::details::worker_thread*> > >(void*) + 45
5 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
6 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 7:: AMCP Logging Spool
0 libsystem_kernel.dylib 0x00007fff6f55fe36 semaphore_wait_trap + 10
1 com.apple.audio.caulk 0x00007fff68f6ab16 caulk::mach::semaphore::wait() + 16
2 com.apple.audio.caulk 0x00007fff68f6a9b2 caulk::semaphore::timed_wait(double) + 106
3 com.apple.audio.caulk 0x00007fff68f6a7c4 caulk::concurrent::details::worker_thread::run() + 30
4 com.apple.audio.caulk 0x00007fff68f6a1e4 void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::*)(), std::__1::tuple<caulk::concurrent::details::worker_thread*> > >(void*) + 45
5 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
6 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 8:
0 libsystem_pthread.dylib 0x00007fff6f622b68 start_wqthread + 0
Thread 9:
0 libsystem_pthread.dylib 0x00007fff6f622b68 start_wqthread + 0
Thread 10:
0 libsystem_pthread.dylib 0x00007fff6f622b68 start_wqthread + 0
Thread 11:
0 libsystem_pthread.dylib 0x00007fff6f622b68 start_wqthread + 0
Thread 12:
0 libsystem_pthread.dylib 0x00007fff6f622b68 start_wqthread + 0
Thread 13:
0 libsystem_pthread.dylib 0x00007fff6f622b68 start_wqthread + 0
Thread 14:
0 libsystem_pthread.dylib 0x00007fff6f622b68 start_wqthread + 0
Thread 15:: CVDisplayLink
0 libsystem_kernel.dylib 0x00007fff6f562882 __psynch_cvwait + 10
1 libsystem_pthread.dylib 0x00007fff6f627457 _pthread_cond_wait + 748
2 com.apple.CoreVideo 0x00007fff373d7d2b CVDisplayLink::waitUntil(unsigned long long) + 229
3 com.apple.CoreVideo 0x00007fff373d7238 CVDisplayLink::runIOThread() + 482
4 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
5 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 16:: CVDisplayLink
0 libsystem_kernel.dylib 0x00007fff6f562882 __psynch_cvwait + 10
1 libsystem_pthread.dylib 0x00007fff6f627457 _pthread_cond_wait + 748
2 com.apple.CoreVideo 0x00007fff373d7d2b CVDisplayLink::waitUntil(unsigned long long) + 229
3 com.apple.CoreVideo 0x00007fff373d7238 CVDisplayLink::runIOThread() + 482
4 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
5 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 17 Crashed:: CVDisplayLink
0 com.apple.CoreVideo 0x00007fff373d76ab CVCGDisplayLink::getDisplayTimes(unsigned long long*, unsigned long long*, unsigned long long*) + 65
1 com.apple.CoreVideo 0x00007fff373d7525 CVHWTime::update(double, bool*, bool*) + 57
2 com.apple.CoreVideo 0x00007fff373d73de CVXTime::update() + 44
3 com.apple.CoreVideo 0x00007fff373d711c CVDisplayLink::runIOThread() + 198
4 libsystem_pthread.dylib 0x00007fff6f627109 _pthread_start + 148
5 libsystem_pthread.dylib 0x00007fff6f622b8b thread_start + 15
Thread 17 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000600001d56c38 rcx: 0x00007000060c8da8 rdx: 0x00007000060c8db0
rdi: 0x00007f9e1d18fe20 rsi: 0x00007000060c8db8 rbp: 0x00007000060c8d90 rsp: 0x00007000060c8d60
r8: 0x000000000009ad1d r9: 0x00007f9e1d18fe50 r10: 0x00007f9e1d18fe58 r11: 0x0000000000000206
r12: 0x00007000060c8db8 r13: 0x0000000000000000 r14: 0x00007000060c8e07 r15: 0x00007000060c8db0
rip: 0x00007fff373d76ab rfl: 0x0000000000010246 cr2: 0x0000000000000000
Logical CPU: 0
Error Code: 0x00000000
Trap Number: 0
Followed by a million lines of Binary Images followed by this:
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 54
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: 16801343
thread_create: 0
thread_set_state: 967
VM Region Summary:
ReadOnly portion of Libraries: Total=778.7M resident=0K(0%) swapped_out_or_unallocated=778.7M(100%)
Writable regions: Total=758.5M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=758.5M(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Accelerate framework 1024K 8
Activity Tracing 256K 1
CG backing stores 440K 2
CG image 52K 9
CoreAnimation 2940K 146
CoreData Object IDs 4100K 2
CoreGraphics 8K 1
CoreImage 12K 3
CoreUI image data 392K 7
Foundation 956K 5
IOKit 7940K 1
Image IO 8188K 32
Kernel Alloc Once 8K 1
MALLOC 593.3M 211
MALLOC guard page 48K 11
MALLOC_NANO (reserved) 128.0M 1 reserved VM address space (unallocated)
Memory Tag 242 12K 1
Memory Tag 251 16K 1
SQLite page cache 64K 1
STACK GUARD 56.1M 18
Stack 17.1M 18
VM_ALLOCATE 412K 28
WebKit Malloc 8604K 18
__DATA 55.1M 502
__DATA_CONST 637K 21
__FONT_DATA 4K 1
__GLSLBUILTINS 5176K 1
__LINKEDIT 392.2M 17
__OBJC_RO 32.2M 1
__OBJC_RW 1892K 2
__TEXT 386.5M 487
__UNICODE 564K 1
libnetwork 1664K 24
mapped file 378.0M 74
shared memory 668K 18
=========== ======= =======
TOTAL 2.0G 1675
TOTAL, minus reserved VM space 1.9G 1675
After adding a symbolic breakpoint to "getDisplayTimes" with bt and restarting the app the code immediately stops to show this situation:
Log:
* thread #17, name = 'CVDisplayLink', stop reason = breakpoint 1.1
* frame #0: 0x00007fff3910a66a CoreVideo`CVCGDisplayLink::getDisplayTimes(unsigned long long*, unsigned long long*, unsigned long long*)
frame #1: 0x00007fff3910a525 CoreVideo`CVHWTime::update(double, bool*, bool*) + 57
frame #2: 0x00007fff3910a3de CoreVideo`CVXTime::update() + 44
frame #3: 0x00007fff3910a11c CoreVideo`CVDisplayLink::runIOThread() + 198
frame #4: 0x0000000101047c65 libsystem_pthread.dylib`_pthread_start + 148
frame #5: 0x00000001010434af libsystem_pthread.dylib`thread_start + 15
and this:
1 Answer
I haven’t received any answer from Apple (it’s been months!) so I went ahead and downgraded (which I did not want to do) to Mojave. I haven’t had a single hic up or problem since. I am bewildered.
answered on Stack Overflow Jun 9, 2020 by 
Dr. Cashberg
Dr. CashbergUser contributions licensed under CC BY-SA 3.0