[Resolved] App crashes when launched from dock, doesn't crash when run from terminal

Greetings everyone,


I posted a question about this on SO only to be nit-picked to death, so hopefully that can be avoided here.


Background

I have written an open-source cross-platform app that uses FLTK (which should be using Cocoa under the hood) to manage multiple VNC connections. I am not using Xcode to build this, only a coding editor (Geany) and the Xcode command-line tools.


On macOS my app crashes in a certain spot when launched from the Dock while on Linux, FreeBSD and OpenIndiana the app does not crash.


I am *not* listing any code here because this is more of a conceptual question, not a coding question.


Here is the oddity: When I run this app from the terminal on macOS, it does not crash -- at all, but when launched from the Dock, it crashes at the same point nearly every time.


This is the only question I'm asking: What would cause the app to behave so differently between launching from the Dock compared to being run from the terminal? I am not passing any arguments to the app from either launch method. The app is being launched from the same user account.


Again, I am not asking for code help, and not asking why a certain call is crashing, etc. I'm only wanting to know why my app would crash when launched from the Dock yet is totally fine when launched from the Terminal.


Thank you! :-D


Will B


* macOS 10.15.2
* Mac mini 2018

Accepted Reply

[WillBProg3245 emailed me their crash report.]

Well, that’s an interesting crash you’ve got there. I had a look at your crash report and it didn’t reveal anything new, so I then started poking around in your core.

% lldb -c core.719
(lldb) target create --core "core.719"
Core file '/Users/quinn/Desktop/core.719' (x86_64) was loaded.
(lldb) thread list 
Process 0 stopped
  …
  thread #10: … libxpc.dylib`xpc_release + 6 …
  …
(lldb) thread select 10
…
(lldb) disas -f 
libxpc.dylib`xpc_release:
    0x7fff65659d9e <+0>:  testb  $0x1, %dil
    0x7fff65659da2 <+4>:  jne    0x7fff65659ddd            ; <+63>
->  0x7fff65659da4 <+6>:  movq   (%rdi), %rax
…

As you can see, the program has crashed referencing RDI at +6. So what’s in RDI:

(lldb) p/x $rdi 
(unsigned long) $0 = 0xe2160458f3753a00

Whoah, that does not look even close to a valid pointer. Heap pointers on modern versions of macOS typically look like 0x00006000_xxxxxxxx. Moreover, all pointers on macOS are typically 0x00007***_xxxxxxxx or less. 0xe2160458f3753a00 is way out of range. It’s even out of range if you rotate it by 4 bits (which you’ll commonly see in crash reports because the memory allocate does this to its free list to help track down bugs).

So, where did this come from? Well, it’s crash right at the start of

xpc_release
, meaning that RDI hasn’t been modified, meaning that it’s simply the object to be released. Clearly that’s bogus.

Now let’s pop up a level and look at the caller:

(lldb) f 1
frame #1: … libxpc.dylib`_xpc_dictionary_node_free + 62
…
(lldb) disas -f
libxpc.dylib`_xpc_dictionary_node_free:
    …
    0x7fff6565c843 <+24>: movq   0x8(%rbx), %rcx
    0x7fff6565c847 <+28>: movq   %rcx, 0x8(%rax)
    0x7fff6565c84b <+32>: movq   0x8(%rbx), %rcx
    0x7fff6565c84f <+36>: movq   %rax, (%rcx)
    0x7fff6565c852 <+39>: movq   $-0x1, %rax
    0x7fff6565c859 <+46>: movq   %rax, (%rbx)
    0x7fff6565c85c <+49>: movq   %rax, 0x8(%rbx)
    0x7fff6565c860 <+53>: movq   0x10(%rbx), %rdi
    0x7fff6565c864 <+57>: callq  0x7fff65659d9e     ; xpc_release
->  0x7fff6565c869 <+62>: movq   %rbx, %rdi

RDI comes from RBX + 0x10. In this context RBX is an internal XPC data structure used to manage a dictionary node. Unfortunately XPC isn’t part of Darwin, but the basic structure looks like this:

struct Node {               // offsets
    struct Node * next;     // 0x00
    struct Node * prev;     // 0x08
    xpc_object_t value;     // 0x10
    unsigned int type;      // 0x18
    unsigned int pad;       // 0x1c
    char key[0];            // 0x20
};

where:

  • next
    and
    prev
    are managed by the standard BSD macros in
    <sys/queue.h>
  • key
    is an unbounded array containing the dictionary node’s key
  • pad
    exists because
    key
    is actually a union, and one item of that union has to be pointer aligned

WARNING I’m discussing this structure as an aid to debugging. Do not rely on it for anything other than that. It’s not considered API.

Let’s dump the RBX structure as bytes ASCII and words.

(lldb) m read -c 64 $rbx
0x6000022205f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ????????????????
0x600002220600: 00 3a 75 f3 58 04 16 e2 00 00 00 00 ef bb 3d ef  .:u?X..?....?=?
0x600002220610: 44 33 43 33 30 38 43 46 2d 32 32 35 31 2d 31 41  D3C308CF-2251-1A
0x600002220620: 34 36 2d 46 42 44 37 2d 32 35 33 44 42 32 42 32  46-FBD7-253DB2B2
(lldb) m read -f x -s 8 -c 8 $rbx
0x6000022205f0: 0xffffffffffffffff 0xffffffffffffffff
0x600002220600: 0xe2160458f3753a00 0xef3dbbef00000000
0x600002220610: 0x4643383033433344 0x41312d313532322d
0x600002220620: 0x2d374442462d3634 0x3242324244333532

As you can see,

key
is a UUID, which is pretty reasonable given the context established by the backtrace. The
next
and
prev
fields are both set to
(void *) -1
, which is the
TRASHIT
value form
<sys/queue.h>
. The
type
field is 0, which is reasonable in this context.

That leaves

value
and
pad
, and both of those are very wonky. The
value
field is 0xe2160458f3753a00, which is the RDI value that triggerred the crash. And the
pad
field looks kinda similar, that is, a seemingly random sequence of bytes.

Alas, that’s about as far as I can take this in the time I have available on DevForums. It provides evidence for my initial suspicion, that this is a memory smasher of some form, but that doesn’t help you debug it. I’m actually quite surprised that ASan didn’t turn up anything else (Zombies is unlikely to help given that none of this is Objective-C or Swift).

Some questions:

  • Do you recognise the values in

    value
    (0xe2160458f3753a00) or
    pad
    (0xef3dbbef)? I’m curious if they’re anything obvious from the domain of your app.
  • When you ran with ASan, did you make sure to recompile your entire app, including any (non-system) libraries? When working with ASan, you want it to cover as much as possible, and that means you have to recompile everything with ASan enabled (it’s a shame that there’s no way to enable it for the system frameworks).

  • The other tool worth trying is

    libgmalloc
    . This is not nearly as cool as ASan, but it has one key advantage: It applies to all code in your process, including the system frameworks,

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Replies

What would cause the app to behave so differently between launching from the Dock compared to being run from the terminal?

There are lots of reasons why this might happen. When you run an executable from Terminal, it inherits its execution context from the shell. This includes UNIX-y things, like the current working directory and environment variables, and a bunch of macOS-specific things. If you’re curious about the details, I discuss this in depth in the Execution Contents of Technote 2083 Daemons and Agents and the

MoreSecDestroyInheritedEnvironment
routine in (the ancient) MoreIsBetter sample code.

In contrast, when you launch the app from the Dock (or Finder) it’s launched directly by

launchd
, and thus inherits a ‘vanilla’ environment.

To make this concrete, imagine your app tries to create a file in the current working directory and has a crashing bug in its error handling path. When launched from Terminal, the current working directory wil be inherited from the shell and thus creating a file will likely work. In contrast, when launched from the Finder the current working directory is

/
, and creating files there will typically fail, and thus put the app on the crashing path.

As to what’s causing your code to crash in the standard environment, it’s hard to say. Can you post a crash report?

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

ps DTS is closed 21 Dec through 1 Jan.

Hi Quinn, thanks so much for your message!


Since I can't find a way to attach the log, I'll just post the condensed version here:


Process: SpiritVNC - FLTK [1638]
Path: /Users/USER/*/SpiritVNC - FLTK.app/Contents/MacOS/SpiritVNC - FLTK
Identifier: SpiritVNC - FLTK
Version: 0
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: SpiritVNC - FLTK [1638]
User ID: 502


Date/Time: 2019-12-20 20:16:09.844 -0800
OS Version: Mac OS X 10.15.2 (19C57)
Report Version: 12
Bridge OS Version:4.2 (17P2551)
Anonymous UUID: [redacted]



Time Awake Since Boot: 44000 seconds


System Integrity Protection: enabled


Crashed Thread: 13


Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Exception Note: EXC_CORPSE_NOTIFY


Termination Signal:Segmentation fault: 11
Termination Reason:Namespace SIGNAL, Code 0xb

Terminating Process: exc handler [1638]


Thread 13 Crashed:

0 libxpc.dylib 0x00007fff7320ada4 xpc_release + 6

1 libxpc.dylib 0x00007fff7320d869 _xpc_dictionary_node_free + 62

2 libxpc.dylib 0x00007fff7320ab3f _xpc_dictionary_insert + 181

3 libxpc.dylib 0x00007fff7320f253 xpc_dictionary_set_uint64 + 41

4 libnetwork.dylib 0x00007fff71808d90 nw_path_copy_dictionary_for_agent_with_generation + 864

5 libnetwork.dylib 0x00007fff7177acda nw_path_snapshot_path + 426

6 libnetwork.dylib 0x00007fff7175bfc6 nw_path_evaluator_evaluate + 2102

7 libnetwork.dylib 0x00007fff7175ae57 nw_path_create_evaluator_for_endpoint + 759

8 libnetwork.dylib 0x00007fff71a5ac70 nw_nat64_get_interface_state_internal + 256

9 libnetwork.dylib 0x00007fff71a5a6c9 nw_nat64_copy_prefixes_internal + 105

10 libnetwork.dylib 0x00007fff71a5a32b nw_nat64_copy_prefixes + 171

11 libnetwork.dylib 0x00007fff71a5cf27 nw_nat64_synthesize + 183

12 libsystem_info.dylib 0x00007fff730f2379 _gai_nat64_v4_synthesize + 89

13 libsystem_info.dylib 0x00007fff730cc8b2 _gai_nat64_synthesis + 482

14 libsystem_info.dylib 0x00007fff730cc2a1 si_addrinfo + 1233

15 libsystem_info.dylib 0x00007fff730cbca7 _getaddrinfo_internal + 231

16 libsystem_info.dylib 0x00007fff730cbbad getaddrinfo + 61

17 libvncclient.1.dylib 0x000000010ba95012 ConnectClientToTcpAddr6 + 116

18 libvncclient.1.dylib 0x000000010ba83579 ConnectToRFBServer + 108

19 libvncclient.1.dylib 0x000000010ba969ef rfbInitClient + 1112

20 SpiritVNC - FLTK 0x000000010b8e0b63 VncObject::initVNCConnection(void*) + 643

21 libsystem_pthread.dylib 0x00007fff731d5e65 _pthread_start + 148

22 libsystem_pthread.dylib 0x00007fff731d183b thread_start + 15


Thanks! 🙂

Here's another condensed crash report:


Process: SpiritVNC - FLTK [1619]
Path: /Users/USER/*/SpiritVNC - FLTK.app/Contents/MacOS/SpiritVNC - FLTK
Identifier: SpiritVNC - FLTK
Version: 0
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: SpiritVNC - FLTK [1619]
User ID: 502


Date/Time: 2019-12-20 20:14:38.354 -0800
OS Version: Mac OS X 10.15.2 (19C57)
Report Version: 12
Bridge OS Version:4.2 (17P2551)
Anonymous UUID: [redacted]



Time Awake Since Boot: 44000 seconds


System Integrity Protection: enabled


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


Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000117
Exception Note: EXC_CORPSE_NOTIFY


Termination Signal:Segmentation fault: 11
Termination Reason:Namespace SIGNAL, Code 0xb

Terminating Process: exc handler [1619]


VM Regions Near 0x117:

-->

__TEXT 000000010866f000-0000000108698000 [ 164K] r-x/r-x SM=COW /Users/USER/*/SpiritVNC - FLTK.app/Contents/MacOS/SpiritVNC - FLTK


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

0 libdispatch.dylib 0x00007fff72f9690a _voucher_xref_dispose + 89
1 com.apple.CoreFoundation0x00007fff3bbdb4a8 _CFRelease + 265
2 com.apple.HIToolbox 0x00007fff3a67e763 _DropPendingBoost + 49
3 com.apple.HIToolbox 0x00007fff3a664380 ReceiveNextEventCommon + 571
4 com.apple.HIToolbox 0x00007fff3a664127 _BlockUntilNextEventMatchingListInModeWithFilter + 64
5 com.apple.AppKit 0x00007fff38cd5eb4 _DPSNextEvent + 990
6 com.apple.AppKit 0x00007fff38cd4690 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
7 libfltk.1.3.dylib 0x0000000108753a79 fl_wait(double) + 150
8 libfltk.1.3.dylib 0x0000000108753b65 fl_mac_flush_and_wait(double) + 179
9 libfltk.1.3.dylib 0x0000000108760f01 Fl::wait() + 27
10 SpiritVNC - FLTK 0x000000010868c4a0 VncObject::createVNCObject(HostItem*, bool) + 1024
11 SpiritVNC - FLTK 0x00000001086792ab svHandleHostListEvents(Fl_Widget*, void*) + 267
12 libfltk.1.3.dylib 0x00000001087ab2c5 Fl_Widget::do_callback(Fl_Widget*, void*) + 55
13 libfltk.1.3.dylib 0x0000000108766e7b Fl_Browser_::handle(int) + 863
14 libfltk.1.3.dylib 0x0000000108761d3b send_event(int, Fl_Widget*, Fl_Window*) + 127
15 libfltk.1.3.dylib 0x000000010876171d Fl::handle_(int, Fl_Window*) + 291
16 libfltk.1.3.dylib 0x0000000108756736 cocoaMouseHandler(NSEvent*) + 701
17 com.apple.AppKit 0x00007fff38e7cfba -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2738
18 com.apple.AppKit 0x00007fff38e7c2e5 -[NSWindow(NSEventRouting) sendEvent:] + 349
19 com.apple.AppKit 0x00007fff38e7a65c -[NSApplication(NSEvent) sendEvent:] + 352
20 libfltk.1.3.dylib 0x0000000108753a9c fl_wait(double) + 185
21 libfltk.1.3.dylib 0x0000000108753b65 fl_mac_flush_and_wait(double) + 179
22 libfltk.1.3.dylib 0x0000000108760f20 Fl::check() + 12
23 SpiritVNC - FLTK 0x000000010868ea1e VncObject::masterMessageLoop(void*) + 286
24 SpiritVNC - FLTK 0x000000010868830b main + 315
25 libdyld.dylib 0x00007fff72fd17fd start + 1

These two crash reports are in very different subsystems, which suggests that you have a memory management problem. As a first step, I recommend that you apply the standard memory debugging tools.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Thanks for the info Quinn.


I used most of the techniques you mentioned and they did not produce any meaningful results.


It's frustrating because I used my app extensively, launched from the command-line, over the last two weeks and did not experience even one crash, but I can launch the exact same app from the Dock and it crashes after a few actions.


I guess the next step is to ask the FLTK folks if they have any clues about this.


Thanks for the help! 🙂

Does the crash happen if you start the app within

lldb
?

If not, one way to investigate this is to add a

pause
call to the start of your app. You can then launch it from the Finder and it’ll stop, at which point you can attach to it from
lldb
. That should reproduce the problem, because the app was started in the standard environment, while allowing you to investigate it in the debugger.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Thanks for the advice. 🙂


Comically, my app does *not* crash when run from lldb or even when attached to lldb. I can use my app fine, crash-free, while under lldb. As soon as I detach lldb from my app and perform actions in it, I get this crash (please disregard the other earlier crash report with 'voucher_xref_dispose', that issue appears to be resolved). This is the same crash I get when launched from the Dock:


Thread 6 Crashed:

0 libxpc.dylib 0x00007fff701c4da4 xpc_release + 6

1 libxpc.dylib 0x00007fff701c7869 _xpc_dictionary_node_free + 62

2 libxpc.dylib 0x00007fff701c4b3f _xpc_dictionary_insert + 181

3 libxpc.dylib 0x00007fff701c9253 xpc_dictionary_set_uint64 + 41

4 libnetwork.dylib 0x00007fff6e7c2d90 nw_path_copy_dictionary_for_agent_with_generation + 864

5 libnetwork.dylib 0x00007fff6e734cda nw_path_snapshot_path + 426

6 libnetwork.dylib 0x00007fff6e715fc6 nw_path_evaluator_evaluate + 2102

7 libnetwork.dylib 0x00007fff6e714e57 nw_path_create_evaluator_for_endpoint + 759

8 libnetwork.dylib 0x00007fff6ea14c70 nw_nat64_get_interface_state_internal + 256

9 libnetwork.dylib 0x00007fff6ea146c9 nw_nat64_copy_prefixes_internal + 105

10 libnetwork.dylib 0x00007fff6ea1432b nw_nat64_copy_prefixes + 171

11 libnetwork.dylib 0x00007fff6ea16f27 nw_nat64_synthesize + 183

12 libsystem_info.dylib 0x00007fff700ac379 _gai_nat64_v4_synthesize + 89

13 libsystem_info.dylib 0x00007fff700868b2 _gai_nat64_synthesis + 482

14 libsystem_info.dylib 0x00007fff700862a1 si_addrinfo + 1233

15 libsystem_info.dylib 0x00007fff70085ca7 _getaddrinfo_internal + 231

16 libsystem_info.dylib 0x00007fff70085bad getaddrinfo + 61

17 libvncclient.1.dylib 0x00000001006a7012 ConnectClientToTcpAddr6 + 116

18 libvncclient.1.dylib 0x0000000100695579 ConnectToRFBServer + 108

19 libvncclient.1.dylib 0x00000001006a89ef rfbInitClient + 1112

20 SpiritVNC - FLTK 0x00000001004ec98b VncObject::initVNCConnection(void*) + 971 (vnc.cxx:635)

21 libsystem_pthread.dylib 0x00007fff7018fe65 _pthread_start + 148

22 libsystem_pthread.dylib 0x00007fff7018b83b thread_start + 15

Comically, my app does not crash when run from

lldb
or even when attached to
lldb
.

Curious. This rules out most environmental issues. If you launch the app from Finder (or Dock, those are equivalent) it runs in the standard environment, and attaching with LLDB doesn’t change that.

Two things:

  • Please post a full crash report. Use the

    <>
    button to format it as code.
  • Can you get a core dump? macOS does not enable core dumps by default but you can enable them from your app by running the following code at startup:

    struct rlimit limit;
    BOOL success = getrlimit(RLIMIT_CORE, &limit) >= 0;
    assert(success);
    limit.rlim_cur = limit.rlim_max;
    success = setrlimit(RLIMIT_CORE, &limit) >= 0;
    assert(success);

    Note It seems that, out of the box, 10.15 sets the permissions on

    /cores/
    to
    drwxr-xr-x
    . For an app (not running as root) to generate a core this must be
    drwxrwxrwt
    . You can change this as follows:
    % sudo chmod 1777 /cores

    Don’t forget to change it back when you’re done.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Thank you 🙂


The core is available at: https://www.pismotek.com/downloads/core.719.zip


Here is the corresponding crash report:


Process:           
SpiritVNC - FLTK [719]

Path:              
/Users/USER/*/SpiritVNC - FLTK.app/Contents/MacOS/SpiritVNC - FLTK

Identifier:        
SpiritVNC - FLTK

Version:           
0

Code Type:         
X86-64 (Native)

Parent Process:    
??? [1]

Responsible:       
SpiritVNC - FLTK [719]

User ID:           
502




Date/Time:         
2020-01-07 09:05:47.291 -0800

OS Version:        
Mac OS X 10.15.2 (19C57)

Report Version:    
12

Bridge OS Version: 
4.2 (17P2551)

Anonymous UUID:    
[redacted]




Time Awake Since Boot: 3900 seconds

System Integrity Protection: enabled

Crashed Thread:    
9




Exception Type:    
EXC_BAD_ACCESS (SIGSEGV)

Exception Codes:   
EXC_I386_GPFLT

Exception Note:    
EXC_CORPSE_NOTIFY




Termination Signal:
Segmentation fault: 11

Termination Reason:
Namespace SIGNAL, Code 0xb



Terminating Process:   exc handler [719]

Thread 0:: Dispatch queue: com.apple.main-thread
0   libsystem_platform.dylib 

 0x00007fff65616c09 _platform_bzero$VARIANT$Haswell + 41

1   libsystem_malloc.dylib   

 0x00007fff655e1be2 large_malloc + 1223

2   libsystem_malloc.dylib   

 0x00007fff655d7357 szone_malloc_should_clear + 235

3   libsystem_malloc.dylib   

 0x00007fff655d832c malloc_zone_calloc + 99

4   com.apple.CoreGraphics   

 0x00007fff2e3a0197 CGSImageDataHandleCreate + 83

5   com.apple.CoreGraphics   

 0x00007fff2e39e4e9 img_data_lock + 6513

6   com.apple.CoreGraphics   

 0x00007fff2e39908b CGSImageDataLock + 1433

7   com.apple.CoreGraphics   

 0x00007fff2e398292 ripc_AcquireRIPImageData + 460

8   com.apple.CoreGraphics   

 0x00007fff2e396f6c ripc_DrawImage + 1198

9   com.apple.CoreGraphics   

 0x00007fff2e3961d0 CGContextDrawImageWithOptions + 454

10  com.apple.QuartzCore     

 0x00007fff3978da44 CA::Render::(anonymous namespace)::create_image_by_rendering(CGImage*, CGColorSpace*, unsigned int, double, CA::Render::ImageCopyType) + 1145

11  com.apple.QuartzCore     

 0x00007fff3978c70f CA::Render::copy_image(CGImage*, CGColorSpace*, unsigned int, double, double) + 4042

12  com.apple.QuartzCore     

 0x00007fff3978b72e CA::Render::prepare_image(CGImage*, CGColorSpace*, unsigned int, double) + 20

13  com.apple.QuartzCore     

 0x00007fff3978b4f9 CA::Layer::prepare_commit(CA::Transaction*) + 575

14  com.apple.QuartzCore     

 0x00007fff397653e9 CA::Context::commit_transaction(CA::Transaction*, double) + 349

15  com.apple.QuartzCore     

 0x00007fff39764002 CA::Transaction::commit() + 638

16  com.apple.QuartzCore     

 0x00007fff3979f966 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 66

17  com.apple.CoreFoundation 

 0x00007fff2df5e0ee __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23

18  com.apple.CoreFoundation 

 0x00007fff2df5e014 __CFRunLoopDoObservers + 457

19  com.apple.CoreFoundation 

 0x00007fff2df5cc0e CFRunLoopRunSpecific + 558

20  com.apple.HIToolbox      

 0x00007fff2cab365d RunCurrentEventLoopInMode + 292

21  com.apple.HIToolbox      

 0x00007fff2cab32a9 ReceiveNextEventCommon + 356

22  com.apple.HIToolbox      

 0x00007fff2cab3127 _BlockUntilNextEventMatchingListInModeWithFilter + 64

23  com.apple.AppKit         

 0x00007fff2b124eb4 _DPSNextEvent + 990

24  com.apple.AppKit         

 0x00007fff2b123690 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352

25  libfltk.1.3.dylib        

 0x000000010b1f5a79 fl_wait(double) + 150

26  libfltk.1.3.dylib        

 0x000000010b1f5b65 fl_mac_flush_and_wait(double) + 179

27  libfltk.1.3.dylib        

 0x000000010b202f20 Fl::check() + 12

28  SpiritVNC - FLTK         

 0x000000010b12783f VncObject::createVNCObject(HostItem*, bool) + 3039 (vnc.cxx:191)

29  SpiritVNC - FLTK         

 0x000000010b113c7c svHandleHostListEvents(Fl_Widget*, void*) + 300 (app.cxx:1317)

30  libfltk.1.3.dylib        

 0x000000010b24d2c5 Fl_Widget::do_callback(Fl_Widget*, void*) + 55

31  libfltk.1.3.dylib        

 0x000000010b208e7b Fl_Browser_::handle(int) + 863

32  libfltk.1.3.dylib        

 0x000000010b203d3b send_event(int, Fl_Widget*, Fl_Window*) + 127

33  libfltk.1.3.dylib        

 0x000000010b20371d Fl::handle_(int, Fl_Window*) + 291

34  libfltk.1.3.dylib        

 0x000000010b1f8736 cocoaMouseHandler(NSEvent*) + 701

35  com.apple.AppKit         

 0x00007fff2b2cbfba -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2738

36  com.apple.AppKit         

 0x00007fff2b2cb2e5 -[NSWindow(NSEventRouting) sendEvent:] + 349

37  com.apple.AppKit         

 0x00007fff2b2c965c -[NSApplication(NSEvent) sendEvent:] + 352

38  libfltk.1.3.dylib        

 0x000000010b1f5a9c fl_wait(double) + 185

39  libfltk.1.3.dylib        

 0x000000010b1f5b65 fl_mac_flush_and_wait(double) + 179

40  libfltk.1.3.dylib        

 0x000000010b202f20 Fl::check() + 12

41  SpiritVNC - FLTK         

 0x000000010b12783f VncObject::createVNCObject(HostItem*, bool) + 3039 (vnc.cxx:191)

42  SpiritVNC - FLTK         

 0x000000010b113c7c svHandleHostListEvents(Fl_Widget*, void*) + 300 (app.cxx:1317)

43  libfltk.1.3.dylib        

 0x000000010b24d2c5 Fl_Widget::do_callback(Fl_Widget*, void*) + 55

44  libfltk.1.3.dylib        

 0x000000010b208e7b Fl_Browser_::handle(int) + 863

45  libfltk.1.3.dylib        

 0x000000010b203d3b send_event(int, Fl_Widget*, Fl_Window*) + 127

46  libfltk.1.3.dylib        

 0x000000010b20371d Fl::handle_(int, Fl_Window*) + 291

47  libfltk.1.3.dylib        

 0x000000010b1f8736 cocoaMouseHandler(NSEvent*) + 701

48  com.apple.AppKit         

 0x00007fff2b2cbfba -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2738

49  com.apple.AppKit         

 0x00007fff2b2cb2e5 -[NSWindow(NSEventRouting) sendEvent:] + 349

50  com.apple.AppKit         

 0x00007fff2b2c965c -[NSApplication(NSEvent) sendEvent:] + 352

51  libfltk.1.3.dylib        

 0x000000010b1f5a9c fl_wait(double) + 185

52  libfltk.1.3.dylib        

 0x000000010b1f5b65 fl_mac_flush_and_wait(double) + 179

53  libfltk.1.3.dylib        

 0x000000010b202f20 Fl::check() + 12

54  SpiritVNC - FLTK         

 0x000000010b129960 VncObject::masterMessageLoop(void*) + 352 (vnc.cxx:700)

55  SpiritVNC - FLTK         

 0x000000010b122e77 main + 487 (spiritvnc.cxx:124)

56  libdyld.dylib            

 0x00007fff654207fd start + 1




Thread 1:: com.apple.NSEventThread
0   libsystem_kernel.dylib   

 0x00007fff6556125a mach_msg_trap + 10

1   libsystem_kernel.dylib   

 0x00007fff655615d0 mach_msg + 60

2   com.apple.CoreFoundation 

 0x00007fff2df5ed0b __CFRunLoopServiceMachPort + 322

3   com.apple.CoreFoundation 

 0x00007fff2df5d8e7 __CFRunLoopRun + 1695

4   com.apple.CoreFoundation 

 0x00007fff2df5cbd3 CFRunLoopRunSpecific + 499

5   com.apple.AppKit         

 0x00007fff2b2c7a72 _NSEventThread + 132

6   libsystem_pthread.dylib  

 0x00007fff65624e65 _pthread_start + 148

7   libsystem_pthread.dylib  

 0x00007fff6562083b thread_start + 15




Thread 2:
0   libsystem_pthread.dylib  

 0x00007fff65620818 start_wqthread + 0




Thread 3:
0   libsystem_pthread.dylib  

 0x00007fff65620818 start_wqthread + 0




Thread 4:
0   libsystem_pthread.dylib  

 0x00007fff65620818 start_wqthread + 0




Thread 5:
0   libsystem_kernel.dylib   

 0x00007fff655647de __connect + 10

1   SpiritVNC - FLTK         

 0x000000010b124421 svCreateSSHConnection(void*) + 945 (ssh.cxx:106)

2   libsystem_pthread.dylib  

 0x00007fff65624e65 _pthread_start + 148

3   libsystem_pthread.dylib  

 0x00007fff6562083b thread_start + 15




Thread 6:
0   libsystem_kernel.dylib   

 0x00007fff655647de __connect + 10

1   libvncclient.1.dylib     

 0x000000010b2e306c ConnectClientToTcpAddr6 + 206

2   libvncclient.1.dylib     

 0x000000010b2d1579 ConnectToRFBServer + 108

3   libvncclient.1.dylib     

 0x000000010b2e49ef rfbInitClient + 1112

4   SpiritVNC - FLTK         

 0x000000010b128a8e VncObject::initVNCConnection(void*) + 734 (vnc.cxx:588)

5   libsystem_pthread.dylib  

 0x00007fff65624e65 _pthread_start + 148

6   libsystem_pthread.dylib  

 0x00007fff6562083b thread_start + 15




Thread 7:
0   libsystem_kernel.dylib   

 0x00007fff655647de __connect + 10

1   SpiritVNC - FLTK         

 0x000000010b124421 svCreateSSHConnection(void*) + 945 (ssh.cxx:106)

2   libsystem_pthread.dylib  

 0x00007fff65624e65 _pthread_start + 148

3   libsystem_pthread.dylib  

 0x00007fff6562083b thread_start + 15




Thread 8:
0   libsystem_kernel.dylib   

 0x00007fff655647de __connect + 10

1   libvncclient.1.dylib     

 0x000000010b2e306c ConnectClientToTcpAddr6 + 206

2   libvncclient.1.dylib     

 0x000000010b2d1579 ConnectToRFBServer + 108

3   libvncclient.1.dylib     

 0x000000010b2e49ef rfbInitClient + 1112

4   SpiritVNC - FLTK         

 0x000000010b128a8e VncObject::initVNCConnection(void*) + 734 (vnc.cxx:588)

5   libsystem_pthread.dylib  

 0x00007fff65624e65 _pthread_start + 148

6   libsystem_pthread.dylib  

 0x00007fff6562083b thread_start + 15




Thread 9 Crashed:
0   libxpc.dylib             

 0x00007fff65659da4 xpc_release + 6

1   libxpc.dylib             

 0x00007fff6565c869 _xpc_dictionary_node_free + 62

2   libxpc.dylib             

 0x00007fff65659b3f _xpc_dictionary_insert + 181

3   libxpc.dylib             

 0x00007fff6565e253 xpc_dictionary_set_uint64 + 41

4   libnetwork.dylib         

 0x00007fff63c57d90 nw_path_copy_dictionary_for_agent_with_generation + 864

5   libnetwork.dylib         

 0x00007fff63bc9cda nw_path_snapshot_path + 426

6   libnetwork.dylib         

 0x00007fff63baafc6 nw_path_evaluator_evaluate + 2102

7   libnetwork.dylib         

 0x00007fff63ba9e57 nw_path_create_evaluator_for_endpoint + 759

8   libnetwork.dylib         

 0x00007fff63ea9c70 nw_nat64_get_interface_state_internal + 256

9   libnetwork.dylib         

 0x00007fff63ea96c9 nw_nat64_copy_prefixes_internal + 105

10  libnetwork.dylib         

 0x00007fff63ea932b nw_nat64_copy_prefixes + 171

11  libnetwork.dylib         

 0x00007fff63eabf27 nw_nat64_synthesize + 183

12  libsystem_info.dylib     

 0x00007fff65541379 _gai_nat64_v4_synthesize + 89

13  libsystem_info.dylib     

 0x00007fff6551b8b2 _gai_nat64_synthesis + 482

14  libsystem_info.dylib     

 0x00007fff6551b2a1 si_addrinfo + 1233

15  libsystem_info.dylib     

 0x00007fff6551aca7 _getaddrinfo_internal + 231

16  libsystem_info.dylib     

 0x00007fff6551abad getaddrinfo + 61

17  libvncclient.1.dylib     

 0x000000010b2e3012 ConnectClientToTcpAddr6 + 116

18  libvncclient.1.dylib     

 0x000000010b2d1579 ConnectToRFBServer + 108

19  libvncclient.1.dylib     

 0x000000010b2e49ef rfbInitClient + 1112

20  SpiritVNC - FLTK         

 0x000000010b128a8e VncObject::initVNCConnection(void*) + 734 (vnc.cxx:588)

21  libsystem_pthread.dylib  

 0x00007fff65624e65 _pthread_start + 148

22  libsystem_pthread.dylib  

 0x00007fff6562083b thread_start + 15




Thread 10:
0   libsystem_kernel.dylib   

 0x00007fff655695be __select + 10

1   libfltk.1.3.dylib        

 0x000000010b1f4a2d DataReady::DataReadyThread(void*) + 259

2   libsystem_pthread.dylib  

 0x00007fff65624e65 _pthread_start + 148

3   libsystem_pthread.dylib  

 0x00007fff6562083b thread_start + 15




Thread 9 crashed with X86 Thread State (64-bit):
  rax: 0xffffffffffffffff  rbx: 0x00006000022205f0  rcx: 0x0000600002500a50  rdx: 0x6905beefbd2956e8
  rdi: 0xe2160458f3753a00  rsi: 0x0000600002220610  rbp: 0x00007000094e8d50  rsp: 0x00007000094e8d38
   r8: 0x0000000000000000   r9: 0x0000000000000240  r10: 0x00007fff8f421798  r11: 0x00007fff653c6f4f
  r12: 0xe2160458f3753a00  r13: 0x00007000094e8ec0  r14: 0x0000600002500a20  r15: 0xe216061494086add
  rip: 0x00007fff65659da4  rfl: 0x0000000000010246  cr2: 0x00007000094e8fb8
  
Logical CPU: 
6

Error Code:  
0x00000000

Trap Number: 
13





Binary Images:

0x10b109000 -    
0x10b132ff3 +SpiritVNC - FLTK (0) <3DE3EFBB-3DEF-3989-B1A0-706190D34A38> /Users/USER/*/SpiritVNC - FLTK.app/Contents/MacOS/SpiritVNC - FLTK


0x10b15b000 -    
0x10b162ff3 +libfltk_images.1.3.dylib (0) <76B53C08-F172-354C-AB0B-68183E61718E> /opt/local/lib/libfltk_images.1.3.dylib


0x10b170000 -    
0x10b192ffb +libpng16.16.dylib (0)  /opt/local/lib/libpng16.16.dylib


0x10b1a2000 -    
0x10b1b2ff3 +libz.1.dylib (0) <8553893B-8E4E-3E2C-A558-6EBD9669DF47> /opt/local/lib/libz.1.dylib


0x10b1ba000 -    
0x10b1e7ffb +libjpeg.9.dylib (0)  /opt/local/lib/libjpeg.9.dylib


0x10b1f2000 -    
0x10b277ffb +libfltk.1.3.dylib (0) <2EABDB81-3289-3BE6-B22E-333931534A0D> /opt/local/lib/libfltk.1.3.dylib


0x10b2ce000 -    
0x10b2ebff3 +libvncclient.1.dylib (0) <66781C5D-22E3-394D-BCC1-7B9CF52A06A4> /opt/local/lib/libvncclient.1.dylib


0x10b2f6000 -    
0x10b328ff3 +libvncserver.1.dylib (0)  /opt/local/lib/libvncserver.1.dylib


0x10b34f000 -    
0x10b379ffb +libssh2.1.dylib (0) <1058515E-C3E3-32D2-B36D-D4DE2D112E95> /opt/local/lib/libssh2.1.dylib


0x10b387000 -    
0x10b41aff7 +libgcrypt.20.dylib (0) <32D7260F-2765-3951-9F0B-C7E2564F8140> /opt/local/lib/libgcrypt.20.dylib


0x10b439000 -    
0x10b44cff7 +libsasl2.3.dylib (0) <7EBBD1E2-166E-322C-A271-06C895741D0D> /opt/local/lib/libsasl2.3.dylib


0x10b453000 -    
0x10b46afff +liblzo2.2.dylib (0)  /opt/local/lib/liblzo2.2.dylib


0x10b474000 -    
0x10b5c4fc7 +libgnutls.30.dylib (0) <8CE99A7B-6D1B-350E-A283-8F3545AC9730> /opt/local/lib/libgnutls.30.dylib


0x10b60d000 -    
0x10b622ffb +libgpg-error.0.dylib (0) <2A1307FC-C5D3-3AAC-8293-659999C73A11> /opt/local/lib/libgpg-error.0.dylib


0x10b62d000 -    
0x10b635ff7 +libintl.8.dylib (0) <1DDA13D4-AC56-374E-9B4C-99E429BBBD0A> /opt/local/lib/libintl.8.dylib


0x10b642000 -    
0x10b735ff3 +libiconv.2.dylib (0) <0F039BC8-8F83-36DB-A7C6-E231A414749D> /opt/local/lib/libiconv.2.dylib


0x10b745000 -    
0x10b773fff +libgssapi_krb5.2.2.dylib (0) <99ED22AF-DE80-334D-B377-72AD34D6939B> /opt/local/lib/libgssapi_krb5.2.2.dylib


0x10b78a000 -    
0x10b809fff +libkrb5.3.3.dylib (0) <2E0130F9-EB06-3260-8C97-BFE6BB0F5FCF> /opt/local/lib/libkrb5.3.3.dylib


0x10b846000 -    
0x10b855ff3 +libk5crypto.3.1.dylib (0) <100885EE-9C28-3EDD-93A8-0B23418DEEA9> /opt/local/lib/libk5crypto.3.1.dylib


0x10b860000 -    
0x10b861ffb +libcom_err.1.1.dylib (0) <1D7070FF-100D-37F3-80A9-EFB2342A6538> /opt/local/lib/libcom_err.1.1.dylib


0x10b868000 -    
0x10b86efff +libkrb5support.1.1.dylib (0) <0DAB9411-36B3-38C5-A8D6-44DE86957568> /opt/local/lib/libkrb5support.1.1.dylib


0x10b878000 -    
0x10ba00ee7 +libcrypto.1.1.dylib (0)  /opt/local/lib/libcrypto.1.1.dylib


0x10ba93000 -    
0x10bb35ff3 +libp11-kit.0.dylib (0)  /opt/local/lib/libp11-kit.0.dylib


0x10bbf7000 -    
0x10bc15ffb +libidn2.0.dylib (0)  /opt/local/lib/libidn2.0.dylib


0x10bc1b000 -    
0x10bd7dfff +libunistring.2.dylib (0)  /opt/local/lib/libunistring.2.dylib


0x10bd97000 -    
0x10bda3ff7 +libtasn1.6.dylib (0)  /opt/local/lib/libtasn1.6.dylib


0x10bdae000 -    
0x10bdd5ffb +libnettle.7.dylib (0) <7CB1E3EC-8889-3EF2-B82C-DB68D2291165> /opt/local/lib/libnettle.7.dylib


0x10bdfb000 -    
0x10be23ff7 +libhogweed.5.dylib (0)  /opt/local/lib/libhogweed.5.dylib


0x10be43000 -    
0x10beb2fd7 +libgmp.10.dylib (0) <34D08A81-24BF-3606-8A0C-AB371A2510C0> /opt/local/lib/libgmp.10.dylib


0x10bec2000 -    
0x10bec6ff7 +libffi.6.dylib (0) <2B1DC795-48D6-3682-BA76-6C1A5E2CFABD> /opt/local/lib/libffi.6.dylib


0x10bed0000 -    
0x10bf1ffff +libssl.1.1.dylib (0) <3B825CB5-84D1-3EE7-9381-9F7BBDC3A361> /opt/local/lib/libssl.1.1.dylib


0x10f374000 -    
0x10f377047  libobjc-trampolines.dylib (781.2)  /usr/lib/libobjc-trampolines.dylib


0x119ad8000 -    
0x119b68cb7  dyld (733.8)  /usr/lib/dyld


0x7fff26ba8000 - 
0x7fff26fbcff6  com.apple.driver.AppleIntelKBLGraphicsMTLDriver (14.3.9 - 14.0.3) <3E9269FA-FAB5-3ED0-9179-BA1F2AEEAAEF> /System/Library/Extensions/AppleIntelKBLGraphicsMTLDriver.bundle/Contents/MacOS/AppleIntelKBLGraphicsMTLDriver


0x7fff29c83000 - 
0x7fff29c83fff  com.apple.Accelerate (1.11 - Accelerate 1.11)  /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate


0x7fff29c84000 - 
0x7fff29c9afff  libCGInterfaces.dylib (524.2) <3DA50D4A-BE22-33FB-AE8E-4B68FE3294CF> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/Libraries/libCGInterfaces.dylib


0x7fff29c9b000 - 
0x7fff2a306fef  com.apple.vImage (8.1 - 524.2) <2BDE5231-B5ED-313E-918A-876ACE1C0FCF> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage


0x7fff2a307000 - 
0x7fff2a570fff  libBLAS.dylib (1303.60.1) <94F6B3C0-5039-3F66-8B2E-98791287E459> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib


0x7fff2a571000 - 
0x7fff2a860ff7  libBNNS.dylib (144.40.3)  /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBNNS.dylib


0x7fff2a862000 - 
0x7fff2ac07fff  libLAPACK.dylib (1303.60.1)  /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib


0x7fff2ac08000 - 
0x7fff2ac1dff8  libLinearAlgebra.dylib (1303.60.1)  /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib


0x7fff2ac1e000 - 
0x7fff2ac23ff3  libQuadrature.dylib (7) <17EC31E3-3D77-3B5A-8ADD-6A3DBC1531E7> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libQuadrature.dylib


0x7fff2ac24000 - 
0x7fff2ac94fff  libSparse.dylib (103) <350DAE1C-C990-343F-A98A-1B4317EAA869> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libSparse.dylib


0x7fff2ac95000 - 
0x7fff2aca7fef  libSparseBLAS.dylib (1303.60.1) <8C0C7291-AC3A-3808-9D45-E359A5E03F0E> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libSparseBLAS.dylib


0x7fff2aca8000 - 
0x7fff2ae81ffb  libvDSP.dylib (735.40.1)  /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvDSP.dylib


0x7fff2ae82000 - 
0x7fff2af3dfd7  libvMisc.dylib (735.40.1) <9C40AC77-59A4-3180-AA4F-8F13CABF02D9> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib


0x7fff2af3e000 - 
0x7fff2af3efff  com.apple.Accelerate.vecLib (3.11 - vecLib 3.11)  /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib


0x7fff2af3f000 - 
0x7fff2af9effc  com.apple.Accounts (113 - 113)  /System/Library/Frameworks/Accounts.framework/Versions/A/Accounts


0x7fff2b0e4000 - 
0x7fff2be9ffff  com.apple.AppKit (6.9 - 1894.20.140) <80D94BA8-5CEC-3D85-AEE9-364513234AC6> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit


0x7fff2beef000 - 
0x7fff2beeffff  com.apple.ApplicationServices (48 - 50)  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices


0x7fff2bef0000 - 
0x7fff2bf5bfff  com.apple.ApplicationServices.ATS (377 - 493.0.2.1) <6BDB3B14-0F4E-3B10-93C8-7F0E5E4F2EFE> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/ATS


0x7fff2bff4000 - 
0x7fff2c032ff8  libFontRegistry.dylib (274.0.2.3) <3DD574D6-06F2-35A1-8CE0-6097BDD3DE1F> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib


0x7fff2c08d000 - 
0x7fff2c0bcff7  com.apple.ATSUI (1.0 - 1)  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATSUI.framework/Versions/A/ATSUI


0x7fff2c0bd000 - 
0x7fff2c0c1ff3  com.apple.ColorSyncLegacy (4.13.0 - 1)  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ColorSyncLegacy.framework/Versions/A/ColorSyncLegacy


0x7fff2c15c000 - 
0x7fff2c1b2ff2  com.apple.HIServices (1.22 - 674.1) <8A3BBFB0-D41E-3BF1-AF8F-4E9082A49FC6> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices


0x7fff2c1b3000 - 
0x7fff2c1c1fff  com.apple.LangAnalysis (1.7.0 - 1.7.0)  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis


0x7fff2c1c2000 - 
0x7fff2c207ff2  com.apple.print.framework.PrintCore (15 - 516) <14C48FDF-5E58-391B-873E-B96E55CDA21C> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore


0x7fff2c208000 - 
0x7fff2c212fff  com.apple.QD (4.0 - 413)  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/QD.framework/Versions/A/QD


0x7fff2c213000 - 
0x7fff2c220ff0  com.apple.speech.synthesis.framework (9.0.24 - 9.0.24) <16454C5C-4029-396A-A8F4-730E50CE2024> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/SpeechSynthesis.framework/Versions/A/SpeechSynthesis


0x7fff2c221000 - 
0x7fff2c301ffa  com.apple.audio.toolbox.AudioToolbox (1.14 - 1.14) <9F13C2FB-6042-339A-8D85-E8E499BA856B> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox


0x7fff2c303000 - 
0x7fff2c303fff  com.apple.audio.units.AudioUnit (1.14 - 1.14) <22A443ED-28B0-3161-9CF6-890FD03275D3> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit


0x7fff2c679000 - 
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0x7fff6546e000 - 
0x7fff6546efff  libsystem_blocks.dylib (74) <71A75F21-83AD-382F-95E4-4D6B77B4B9FE> /usr/lib/system/libsystem_blocks.dylib


0x7fff6546f000 - 
0x7fff654f6ff7  libsystem_c.dylib (1353.60.8)  /usr/lib/system/libsystem_c.dylib


0x7fff654f7000 - 
0x7fff654faffb  libsystem_configuration.dylib (1061.40.2)  /usr/lib/system/libsystem_configuration.dylib


0x7fff654fb000 - 
0x7fff654feff7  libsystem_coreservices.dylib (114)  /usr/lib/system/libsystem_coreservices.dylib


0x7fff654ff000 - 
0x7fff65507fff  libsystem_darwin.dylib (1353.60.8) <9AC37996-630C-3B1E-8285-CFC77B684359> /usr/lib/system/libsystem_darwin.dylib


0x7fff65508000 - 
0x7fff6550fffb  libsystem_dnssd.dylib (1096.60.2) <7F0DF910-F4AC-3CED-9494-295B5E45549C> /usr/lib/system/libsystem_dnssd.dylib


0x7fff65510000 - 
0x7fff65511ffb  libsystem_featureflags.dylib (17) <985005B7-C0B3-3DCA-B064-6D34A0687212> /usr/lib/system/libsystem_featureflags.dylib


0x7fff65512000 - 
0x7fff6555ffff  libsystem_info.dylib (538)  /usr/lib/system/libsystem_info.dylib


0x7fff65560000 - 
0x7fff6558cff7  libsystem_kernel.dylib (6153.61.1) <90F8650F-D3A9-38B3-BB8C-B5D3686393BC> /usr/lib/system/libsystem_kernel.dylib


0x7fff6558d000 - 
0x7fff655d4fcf  libsystem_m.dylib (3178) <92F1FF45-BD1C-32FE-A9A9-D12AF02C8212> /usr/lib/system/libsystem_m.dylib


0x7fff655d5000 - 
0x7fff655fcfff  libsystem_malloc.dylib (283.60.1) <51472F42-71BE-348F-B42E-4EDD3040B690> /usr/lib/system/libsystem_malloc.dylib


0x7fff655fd000 - 
0x7fff6560affb  libsystem_networkextension.dylib (1095.60.2) <846C06C0-A705-38AE-8A29-3FA4153252B3> /usr/lib/system/libsystem_networkextension.dylib


0x7fff6560b000 - 
0x7fff65614ff3  libsystem_notify.dylib (241) <7CB7DE46-5877-3CAD-8526-CACEA22F3AD5> /usr/lib/system/libsystem_notify.dylib


0x7fff65615000 - 
0x7fff6561efef  libsystem_platform.dylib (220)  /usr/lib/system/libsystem_platform.dylib


0x7fff6561f000 - 
0x7fff65629fff  libsystem_pthread.dylib (416.60.2) <9D14694F-F3FE-385D-9B23-6A87844D5CBF> /usr/lib/system/libsystem_pthread.dylib


0x7fff6562a000 - 
0x7fff6562efff  libsystem_sandbox.dylib (1217.61.1)  /usr/lib/system/libsystem_sandbox.dylib


0x7fff6562f000 - 
0x7fff65631fff  libsystem_secinit.dylib (62.60.1) <129C187A-E580-3F00-A0C3-E96A633364F1> /usr/lib/system/libsystem_secinit.dylib


0x7fff65632000 - 
0x7fff65639ffb  libsystem_symptoms.dylib (1238.60.1) <5540DEA3-9C3A-3991-8C3A-7B375A5410C7> /usr/lib/system/libsystem_symptoms.dylib


0x7fff6563a000 - 
0x7fff65650ff2  libsystem_trace.dylib (1147.60.3)  /usr/lib/system/libsystem_trace.dylib


0x7fff65652000 - 
0x7fff65657ffb  libunwind.dylib (35.4) <769F4C16-2746-3182-85C1-45CC98D119C8> /usr/lib/system/libunwind.dylib


0x7fff65658000 - 
0x7fff6568cffe  libxpc.dylib (1738.61.1)  /usr/lib/system/libxpc.dylib




External Modification Summary:
  Calls made by other processes targeting this process:

task_for_pid: 1


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: 1860


thread_create: 0


thread_set_state: 0




VM Region Summary:
ReadOnly portion of Libraries: Total=529.0M resident=0K(0%) swapped_out_or_unallocated=529.0M(100%)
Writable regions: Total=653.9M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=653.9M(100%)


VIRTUAL   REGION 

REGION TYPE                    
SIZE
COUNT (non-coalesced) 

===========                 
=======  ======= 

Accelerate framework           
256K    
2 

Activity Tracing               
256K    
1 

CG backing stores              
336K    
2 

CG image                      
8460K    
3 

CG raster data                
16.5M    
2 

CoreAnimation                 
16.5M    
8 

CoreGraphics                     
8K    
1 

CoreImage                        
8K    
2 

CoreUI image data              
224K    
4 

Foundation                       
4K    
1 

Kernel Alloc Once                
8K    
1 

MALLOC                       
623.2M  
137 

Memory Tag 242                  
12K    
1 

Stack                         
69.1M   
22 

VM_ALLOCATE                     
40K    
9 

__DATA                        
23.0M  
301 

__DATA_CONST                   
500K   
32 

__FONT_DATA                      
4K    
1 

__LINKEDIT                   
356.3M  
211 

__OBJC_RO                     
32.0M   
17 

__OBJC_RW                     
1780K    
2 

__TEXT                       
172.6M  
373 

__UNICODE                      
564K    
2 

mapped file                   
56.5M   
18 

shared memory                  
680K   
17 

===========                 
=======  ======= 

TOTAL                          
1.3G 
1170 




Model: Macmini8,1, BootROM 1037.60.58.0.0 (iBridge: 17.16.12551.0.0,0), 6 processors, 6-Core Intel Core i7, 3.2 GHz, 16 GB, SMC 
Graphics: kHW_IntelUHDGraphics630Item, Intel UHD Graphics 630, spdisplays_builtin
Memory Module: BANK 0/ChannelA-DIMM0, 8 GB, DDR4, 2667 MHz, SK Hynix, HMA81GS6CJR8N-VK
Memory Module: BANK 2/ChannelB-DIMM0, 8 GB, DDR4, 2667 MHz, SK Hynix, HMA81GS6CJR8N-VK
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x7BF), wl0: Oct 26 2019 10:18:37 version 9.112.2.0.32.5.40 FWID 01-66dd2dcb
Bluetooth: Version 7.0.2f4, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
USB Device: USB 3.1 Bus
USB Device: Hub
USB Device: Hub
USB Device: USB Keyboard
USB Device: Kensington Eagle Trackball
USB Device: Apple T2 Bus
USB Device: Headset
USB Device: Apple T2 Controller
Thunderbolt Bus: Mac mini, Apple Inc., 47.1
Thunderbolt Bus: Mac mini, Apple Inc., 47.1


Thank you! :-)

Here is the corresponding crash report:

Yeah, that didn’t come across very well. Can you upload it somewhere and post a link? Or just email it to me (my address is in my signature)?

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

[WillBProg3245 emailed me their crash report.]

Well, that’s an interesting crash you’ve got there. I had a look at your crash report and it didn’t reveal anything new, so I then started poking around in your core.

% lldb -c core.719
(lldb) target create --core "core.719"
Core file '/Users/quinn/Desktop/core.719' (x86_64) was loaded.
(lldb) thread list 
Process 0 stopped
  …
  thread #10: … libxpc.dylib`xpc_release + 6 …
  …
(lldb) thread select 10
…
(lldb) disas -f 
libxpc.dylib`xpc_release:
    0x7fff65659d9e <+0>:  testb  $0x1, %dil
    0x7fff65659da2 <+4>:  jne    0x7fff65659ddd            ; <+63>
->  0x7fff65659da4 <+6>:  movq   (%rdi), %rax
…

As you can see, the program has crashed referencing RDI at +6. So what’s in RDI:

(lldb) p/x $rdi 
(unsigned long) $0 = 0xe2160458f3753a00

Whoah, that does not look even close to a valid pointer. Heap pointers on modern versions of macOS typically look like 0x00006000_xxxxxxxx. Moreover, all pointers on macOS are typically 0x00007***_xxxxxxxx or less. 0xe2160458f3753a00 is way out of range. It’s even out of range if you rotate it by 4 bits (which you’ll commonly see in crash reports because the memory allocate does this to its free list to help track down bugs).

So, where did this come from? Well, it’s crash right at the start of

xpc_release
, meaning that RDI hasn’t been modified, meaning that it’s simply the object to be released. Clearly that’s bogus.

Now let’s pop up a level and look at the caller:

(lldb) f 1
frame #1: … libxpc.dylib`_xpc_dictionary_node_free + 62
…
(lldb) disas -f
libxpc.dylib`_xpc_dictionary_node_free:
    …
    0x7fff6565c843 <+24>: movq   0x8(%rbx), %rcx
    0x7fff6565c847 <+28>: movq   %rcx, 0x8(%rax)
    0x7fff6565c84b <+32>: movq   0x8(%rbx), %rcx
    0x7fff6565c84f <+36>: movq   %rax, (%rcx)
    0x7fff6565c852 <+39>: movq   $-0x1, %rax
    0x7fff6565c859 <+46>: movq   %rax, (%rbx)
    0x7fff6565c85c <+49>: movq   %rax, 0x8(%rbx)
    0x7fff6565c860 <+53>: movq   0x10(%rbx), %rdi
    0x7fff6565c864 <+57>: callq  0x7fff65659d9e     ; xpc_release
->  0x7fff6565c869 <+62>: movq   %rbx, %rdi

RDI comes from RBX + 0x10. In this context RBX is an internal XPC data structure used to manage a dictionary node. Unfortunately XPC isn’t part of Darwin, but the basic structure looks like this:

struct Node {               // offsets
    struct Node * next;     // 0x00
    struct Node * prev;     // 0x08
    xpc_object_t value;     // 0x10
    unsigned int type;      // 0x18
    unsigned int pad;       // 0x1c
    char key[0];            // 0x20
};

where:

  • next
    and
    prev
    are managed by the standard BSD macros in
    <sys/queue.h>
  • key
    is an unbounded array containing the dictionary node’s key
  • pad
    exists because
    key
    is actually a union, and one item of that union has to be pointer aligned

WARNING I’m discussing this structure as an aid to debugging. Do not rely on it for anything other than that. It’s not considered API.

Let’s dump the RBX structure as bytes ASCII and words.

(lldb) m read -c 64 $rbx
0x6000022205f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ????????????????
0x600002220600: 00 3a 75 f3 58 04 16 e2 00 00 00 00 ef bb 3d ef  .:u?X..?....?=?
0x600002220610: 44 33 43 33 30 38 43 46 2d 32 32 35 31 2d 31 41  D3C308CF-2251-1A
0x600002220620: 34 36 2d 46 42 44 37 2d 32 35 33 44 42 32 42 32  46-FBD7-253DB2B2
(lldb) m read -f x -s 8 -c 8 $rbx
0x6000022205f0: 0xffffffffffffffff 0xffffffffffffffff
0x600002220600: 0xe2160458f3753a00 0xef3dbbef00000000
0x600002220610: 0x4643383033433344 0x41312d313532322d
0x600002220620: 0x2d374442462d3634 0x3242324244333532

As you can see,

key
is a UUID, which is pretty reasonable given the context established by the backtrace. The
next
and
prev
fields are both set to
(void *) -1
, which is the
TRASHIT
value form
<sys/queue.h>
. The
type
field is 0, which is reasonable in this context.

That leaves

value
and
pad
, and both of those are very wonky. The
value
field is 0xe2160458f3753a00, which is the RDI value that triggerred the crash. And the
pad
field looks kinda similar, that is, a seemingly random sequence of bytes.

Alas, that’s about as far as I can take this in the time I have available on DevForums. It provides evidence for my initial suspicion, that this is a memory smasher of some form, but that doesn’t help you debug it. I’m actually quite surprised that ASan didn’t turn up anything else (Zombies is unlikely to help given that none of this is Objective-C or Swift).

Some questions:

  • Do you recognise the values in

    value
    (0xe2160458f3753a00) or
    pad
    (0xef3dbbef)? I’m curious if they’re anything obvious from the domain of your app.
  • When you ran with ASan, did you make sure to recompile your entire app, including any (non-system) libraries? When working with ASan, you want it to cover as much as possible, and that means you have to recompile everything with ASan enabled (it’s a shame that there’s no way to enable it for the system frameworks).

  • The other tool worth trying is

    libgmalloc
    . This is not nearly as cool as ASan, but it has one key advantage: It applies to all code in your process, including the system frameworks,

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Hi again Quinn,


Thanks for taking the time to look at this. I'll just keep plugging at it and try libgmalloc. 🙂


Thank you! 🙂


Will B

You might try a little old-school debugging. You have the stack trace. So at any critical points along that trace, add some "printf" style debug statements showing all of the values being used. Run it from the Terminal and make note of the valid values. Then run it from the Finder to see the differences.


The only complication is that "printf". These days, I suggest just printing to a text file. Console.app is not useable for these kinds of operations anymore. Even if you do get it to work, it will put significant, abnormal strain on your system. You can avoid Console.app by figuring out how to use the command-line "log" command. But nothing is easier than "tail -f /tmp/log.txt".

Thanks John.


I actually have been using my app's built-in logging facility to examine the value of variables of interest. It is helpful, but it isn't helping with the crash, unfortunately.


Also, to Quinn and John -- how do you set the environment variables for GUI apps launched from the dock? I have found this but it doesn't seem to work on 10.15.x.


Thanks! 😀

I just wanted to let you know that the issue appears to be completely resolved. Yay! 😀


There was a very well-hidden 'use-after-free' that libgmalloc brought to light. It didn't always crash, though. After fixing that, my app no longer crashes when run from the Dock. I'm still a bit surprised that my app would run, crash-free, when run from the command-line as this bad code was being run a *lot*!


Quinn, and John, thank you so much for your help! I'm extremely grateful! 😀