TigerVNC 1.15.x crashes under MacOS Tahoe

Altan Pins

unread,

Sep 18, 2025, 11:03:08 AMSep 18

to TigerVNC User Discussion/Support

Anyone run into this? 1.15.0 worked fine before the upgrade. I've also tried 1.15.80 and it has the same crash.

App launches, gives the connect screen. Enter vnc server name, press connect. App crashes.

I tried deleting / reinstalling.

Here's the trace FWIW.

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process: vncviewer [88522]
Path: /Volumes/*/TigerVNC.app/Contents/MacOS/vncviewer
Identifier: com.tigervnc.tigervnc
Version: 1.15.80 (1.15.80f)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.tigervnc.tigervnc [18398]
User ID: 501

Date/Time: 2025-09-18 10:57:30.5219 -0400
Launch Time: 2025-09-18 10:57:23.3452 -0400
Hardware Model: Mac13,1
OS Version: macOS 26.0 (25A354)
Release Type: User

Crash Reporter Key: 4CFBD1DA-B157-6E19-F11E-819F61E6BBED
Incident Identifier: 35665F60-BB28-4BD0-97A9-05514A348C5C

Time Awake Since Boot: 240000 seconds

System Integrity Protection: enabled

Triggered by Thread: 0

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000008
Exception Codes: 0x0000000000000001, 0x0000000000000008

Termination Reason: Namespace SIGNAL, Code 11, Segmentation fault: 11
Terminating Process: exc handler [88522]

VM Region Info: 0x8 is not in any region. Bytes before following region: 4328931320
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
--->
__TEXT 102064000-1024d4000 [ 4544K] r-x/r-x SM=COW /Volumes/*/TigerVNC.app/Contents/MacOS/vncviewer

Thread 0 Crashed:
0 vncviewer 0x102113a0c -[FLWindowDelegate windowDidMove:] + 60
1 CoreFoundation 0x18cb26574 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 148
2 CoreFoundation 0x18cb8f0c4 ___CFXRegistrationPost_block_invoke + 92
3 CoreFoundation 0x18cb8f008 _CFXRegistrationPost + 436
4 CoreFoundation 0x18cb0508c _CFXNotificationPost + 740
5 Foundation 0x18ed0e3e0 -[NSNotificationCenter postNotificationName:object:userInfo:] + 88
6 AppKit 0x191bbee5c -[NSWindow _wmWindowTilingStateDidChange] + 80
7 AppKit 0x19114ae40 0x190efd000 + 2416192
8 Foundation 0x18e3a9118 closure #1 in _KeyValueCodingAndObserving.observe<A>(_:options:changeHandler:) + 472
9 Foundation 0x18e3ac27c specialized NSKeyValueObservation.Helper._swizzle_me_observeValue(forKeyPath:of:change:context:) + 5456
10 Foundation 0x18e3a8ab8 @objc NSKeyValueObservation.Helper._swizzle_me_observeValue(forKeyPath:of:change:context:) + 192
11 Foundation 0x18e32e448 NSKeyValueNotifyObserver + 252
12 Foundation 0x18e376600 NSKeyValueDidChange + 388
13 Foundation 0x18ecf2620 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:maybeNewValuesDict:usingBlock:] + 760
14 Foundation 0x18ecf2704 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] + 64
15 Foundation 0x18e345704 _NSSetObjectValueAndNotify + 400
16 WindowManagement 0x27cbdb940 __64-[_WMWindow(ServerDrivenProperties) applyAgentPropertySnapshot:]_block_invoke + 284
17 WindowManagement 0x27cbdb074 -[_WMWindow performUpdatesUsingBlock:] + 56
18 WindowManagement 0x27cbdb804 -[_WMWindow(ServerDrivenProperties) applyAgentPropertySnapshot:] + 124
19 WindowManagement 0x27cbe0dc4 __53-[WMClientWindowManager applyAgentPropertySnapshots:]_block_invoke + 244
20 libdispatch.dylib 0x18c8d4b5c _dispatch_call_block_and_release + 32
21 libdispatch.dylib 0x18c8eeac4 _dispatch_client_callout + 16
22 libdispatch.dylib 0x18c90c0e4 _dispatch_main_queue_drain.cold.5 + 812
23 libdispatch.dylib 0x18c8e3f48 _dispatch_main_queue_drain + 180
24 libdispatch.dylib 0x18c8e3e84 _dispatch_main_queue_callback_4CF + 44
25 CoreFoundation 0x18cb5c098 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
26 CoreFoundation 0x18cb2e8cc __CFRunLoopRun + 1944
27 CoreFoundation 0x18cbec898 _CFRunLoopRunSpecificWithOptions + 532
28 HIToolbox 0x19952b730 RunCurrentEventLoopInMode + 316
29 HIToolbox 0x19952e9d0 ReceiveNextEventCommon + 488
30 HIToolbox 0x1996b81f4 _BlockUntilNextEventMatchingListInMode + 48
31 AppKit 0x191406308 _DPSBlockUntilNextEventMatchingListInMode + 236
32 AppKit 0x190f1cedc _DPSNextEvent + 588
33 AppKit 0x19196fa04 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
34 AppKit 0x19196f710 -[NSApplication(NSEventRouting) nextEventMatchingMask:untilDate:inMode:dequeue:] + 72
35 vncviewer 0x102113590 fl_mac_flush_and_wait(double) + 500
36 vncviewer 0x1020c72cc Fl::wait() + 196
37 vncviewer 0x1020fb3fc innards(char const*, char*, char const*, char const*, char const*) + 1420
38 vncviewer 0x1020fb5e4 fl_choice(char const*, char const*, char const*, char const*, ...) + 68
39 vncviewer 0x1020834fc main + 3556
40 dyld 0x18c6d1d54 start + 7184

Thread 1:

Thread 2:
0 libsystem_kernel.dylib 0x18ca4dc34 mach_msg2_trap + 8
1 libsystem_kernel.dylib 0x18ca60028 mach_msg2_internal + 76
2 libsystem_kernel.dylib 0x18ca5698c mach_msg_overwrite + 484
3 libsystem_kernel.dylib 0x18ca4dfb4 mach_msg + 24
4 CoreFoundation 0x18cb2fc80 __CFRunLoopServiceMachPort + 160
5 CoreFoundation 0x18cb2e5d8 __CFRunLoopRun + 1188
6 CoreFoundation 0x18cbec898 _CFRunLoopRunSpecificWithOptions + 532
7 Foundation 0x18ed5d960 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
8 AppKit 0x191457c20 -[NSAnimation _runBlocking] + 412
9 libdispatch.dylib 0x18c8d4b5c _dispatch_call_block_and_release + 32
10 libdispatch.dylib 0x18c8eeac4 _dispatch_client_callout + 16
11 libdispatch.dylib 0x18c90b9ec <deduplicated_symbol> + 32
12 libdispatch.dylib 0x18c8e713c _dispatch_root_queue_drain + 736
13 libdispatch.dylib 0x18c8e7784 _dispatch_worker_thread2 + 180
14 libsystem_pthread.dylib 0x18ca8ce10 _pthread_wqthread + 232
15 libsystem_pthread.dylib 0x18ca8bb9c start_wqthread + 8

Thread 3:: com.apple.NSEventThread
0 libsystem_kernel.dylib 0x18ca4dc34 mach_msg2_trap + 8
1 libsystem_kernel.dylib 0x18ca60028 mach_msg2_internal + 76
2 libsystem_kernel.dylib 0x18ca5698c mach_msg_overwrite + 484
3 libsystem_kernel.dylib 0x18ca4dfb4 mach_msg + 24
4 CoreFoundation 0x18cb2fc80 __CFRunLoopServiceMachPort + 160
5 CoreFoundation 0x18cb2e5d8 __CFRunLoopRun + 1188
6 CoreFoundation 0x18cbec898 _CFRunLoopRunSpecificWithOptions + 532
7 AppKit 0x190faca68 _NSEventThread + 184
8 libsystem_pthread.dylib 0x18ca90c08 _pthread_start + 136
9 libsystem_pthread.dylib 0x18ca8bba8 thread_start + 8

Thread 4:

Thread 5:

Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x00000001024c7f68 x2: 0x00006000039e9e40 x3: 0x0000600003bb4520
x4: 0x00006000039e9e40 x5: 0x0000000000041400 x6: 0x000000016dd97c24 x7: 0x000000016dd97c18
x8: 0x00000000000001f8 x9: 0x00000001024c7f68 x10: 0x000000014d073650 x11: 0x00000000000003ff
x12: 0x0000000000000396 x13: 0x000000014d04a950 x14: 0x07000001024f393f x15: 0x00000001024f3938
x16: 0x00000001024f3938 x17: 0x0000000102112b6c x18: 0x0000000000000000 x19: 0x000000013c606980
x20: 0x0000000000000000 x21: 0x00006000039e9e40 x22: 0x0000600003bb4520 x23: 0x00006000039b1a40
x24: 0x0000000000000000 x25: 0x0000000000041400 x26: 0x0000000000000000 x27: 0x000000500000004b
x28: 0x000000016dd97c88 fp: 0x000000016dd97bd0 lr: 0x0000000102113a08
sp: 0x000000016dd97b90 pc: 0x0000000102113a0c cpsr: 0x60001000
far: 0x0000000000000008 esr: 0x92000006 (Data Abort) byte read Translation fault

Binary Images:
0x102064000 - 0x1024d3fff com.tigervnc.tigervnc (1.15.80) <d04567e1-28fa-341d-bfc7-8149eff2ace6> /Volumes/*/TigerVNC.app/Contents/MacOS/vncviewer
0x10669c000 - 0x1066a7fff libobjc-trampolines.dylib (*) <580e4b29-8304-342d-a21c-2a869364dc35> /usr/lib/libobjc-trampolines.dylib
0x108280000 - 0x1089cbfff com.apple.AGXMetalG13X (340.26.3) <e09c4f6b-8ff6-3edf-9e21-95f237f5a392> /System/Library/Extensions/AGXMetalG13X.bundle/Contents/MacOS/AGXMetalG13X
0x18cad0000 - 0x18d01cf7f com.apple.CoreFoundation (6.9) <edb39786-80b1-3bff-b6c3-e33f2e3ca867> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x18e316000 - 0x18f2a231f com.apple.Foundation (6.9) <f61e71c3-480f-3691-b656-e1281f60a3e3> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x190efd000 - 0x1925f8d9f com.apple.AppKit (6.9) <6d84c7a3-ee98-3daf-ac66-cd95a902ba84> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x27cbd2000 - 0x27cbf1edf com.apple.WindowManagement (1.0) <82c200b5-95d8-3ec7-b64a-506c9f82f6b4> /System/Library/PrivateFrameworks/WindowManagement.framework/Versions/A/WindowManagement
0x18c8d3000 - 0x18c919e9f libdispatch.dylib (*) <17d849c6-a785-3dbb-bfb5-8321706c4b8d> /usr/lib/system/libdispatch.dylib
0x19946a000 - 0x19976c6ff com.apple.HIToolbox (2.1.1) <f369023f-1a24-3f3f-9056-6f5248071e8c> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
0x18c6c9000 - 0x18c767f73 dyld (*) <abfd3247-50ac-3c8e-b72a-83710166e982> /usr/lib/dyld
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
0x18ca4d000 - 0x18ca8945f libsystem_kernel.dylib (*) <2eb73bf1-8c71-3e1f-a160-6da83dc82606> /usr/lib/system/libsystem_kernel.dylib
0x18ca8a000 - 0x18ca96abb libsystem_pthread.dylib (*) <5d31d65c-2ecf-36da-84f5-ba4caab06adb> /usr/lib/system/libsystem_pthread.dylib

External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
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: 0
thread_create: 0
thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=1.7G resident=0K(0%) swapped_out_or_unallocated=1.7G(100%)
Writable regions: Total=1.6G written=755K(0%) resident=755K(0%) swapped_out=0K(0%) unallocated=1.6G(100%)

VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Accelerate framework 128K 1
Activity Tracing 256K 1
CG image 272K 2
CG raster data 528K 6
ColorSync 672K 32
CoreAnimation 1712K 40
CoreGraphics 64K 4
CoreServices 80K 1
CoreUI image data 560K 8
Foundation 16K 1
Kernel Alloc Once 32K 1
MALLOC 1.6G 66
MALLOC guard page 288K 18
STACK GUARD 56.1M 6
Stack 10.6M 6
VM_ALLOCATE 176K 11
__AUTH 5617K 623
__AUTH_CONST 86.3M 1004
__CTF 824 1
__DATA 28.8M 954
__DATA_CONST 32.3M 1012
__DATA_DIRTY 8670K 868
__FONT_DATA 2352 1
__INFO_FILTER 8 1
__LINKEDIT 596.2M 4
__OBJC_RO 78.1M 1
__OBJC_RW 2561K 1
__TEXT 1.2G 1035
__TPRO_CONST 128K 2
mapped file 235.9M 23
page table in kernel 755K 1
shared memory 1520K 19
=========== ======= =======
TOTAL 3.9G 5754

Pierre Ossman

unread,

Sep 19, 2025, 10:02:00 AMSep 19

to Altan Pins, TigerVNC User Discussion/Support

On 18/09/2025 17:03, Altan Pins wrote:
> Anyone run into this? 1.15.0 worked fine before the upgrade. I've also
> tried 1.15.80 and it has the same crash.
>
> App launches, gives the connect screen. Enter vnc server name, press
> connect. App crashes.
>
> I tried deleting / reinstalling.
>

I tried both 1.15.0 and a pre-release here, and I'm afraid I could not
see any crash.

Did you download TigerVNC from our page or somewhere else?

Which VNC server are you using?

Regards,
--
Pierre Ossman Software Development
Cendio AB https://cendio.com
Teknikringen 8 https://twitter.com/ThinLinc
583 30 Linköping https://facebook.com/ThinLinc
Phone: +46-13-214600

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

Altan Pins

unread,

Sep 19, 2025, 11:19:18 AMSep 19

to Pierre Ossman, tigervn...@googlegroups.com

Thanks for looking. Definitely still crashing here.

Downloaded from GitHub releases.

Wayvnc server on a RPI.

Strange you aren’t seeing it.

> On Sep 19, 2025, at 10:01 AM, Pierre Ossman <oss...@cendio.se> wrote:

Pierre Ossman

unread,

Sep 22, 2025, 3:28:55 AMSep 22

to Altan Pins, tigervn...@googlegroups.com

On 19/09/2025 17:19, Altan Pins wrote:
> Thanks for looking. Definitely still crashing here.
>
> Downloaded from GitHub releases.
>
> Wayvnc server on a RPI.
>
> Strange you aren’t seeing it.
>

I tried using wayvnc here now as well. Still no crash. :/

I see that there is a "fl_choice" in the crash stack. Which I would
guess is the reconnect prompt. But I tried that as well without any issues.

So no good ideas why this is happening.

Altan Pins

unread,

Sep 22, 2025, 7:14:27 PMSep 22

to Pierre Ossman, tigervn...@googlegroups.com

Alright, well — wish there was an answer but I know things don’t always reproduce.

I did reboot my Mac, just for the heck of it. TigerVNC still crashing.

I’m thinking the crash has something to do with Tahoe asking whether the app should be allowed to access the local network. When you test, are you able to simulate this “fresh install” condition?

Also, while it shouldn’t make any difference, I’m access a device using “xxxxxx.local”.

Thanks again

Pierre Ossman

unread,

Sep 23, 2025, 3:28:57 AMSep 23

to Altan Pins, tigervn...@googlegroups.com

On 23/09/2025 01:14, Altan Pins wrote:
> Alright, well — wish there was an answer but I know things don’t always reproduce.
>
> I did reboot my Mac, just for the heck of it. TigerVNC still crashing.
>
> I’m thinking the crash has something to do with Tahoe asking whether the app should be allowed to access the local network. When you test, are you able to simulate this “fresh install” condition?
>
> Also, while it shouldn’t make any difference, I’m access a device using “xxxxxx.local”.
>

Clearing those particular permissions is a bit of a pain. I'll see if I
can have a look at it when I have some more time.

Altan Pins

unread,

Sep 29, 2025, 3:55:06 PMSep 29

to Pierre Ossman, tigervn...@googlegroups.com

FYI …

Still occurring with 26.0.1 that was just released.

Reply all

Reply to author

Forward