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fix: Disable swizzling for macOS 26 and above to prevent crashes #720

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victorlunam wants to merge 1 commit into from
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fix: Disable swizzling for macOS 26 and above to prevent crashes #720

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@victorlunam
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@victorlunam victorlunam commented Sep 28, 2025

This PR updates swizzle() to prevent crashes on macOS 26+ by skipping the swizzle entirely. A minor UI issue is accepted as a tradeoff to ensure stability.

Changes:

  • Added #available(macOS 26, *) check.
  • Disabled swizzling on macOS 26+, preserving behavior on earlier versions.

@jordanbaird
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jordanbaird commented Sep 28, 2025

I agree that this would be an acceptable tradeoff to ensure stability. Although, where are you seeing that swizzle() is causing a crash? Can you provide a backtrace? As far as I've seen, most known crashes in macOS 26 are caused by NSWindow.windowNumber returning a larger value than what CGWindowID (aka UInt32) can contain, which wasn't the case in prior macOS versions.

Do you still get crashes when using the latest beta build? https://github.com/jordanbaird/Ice/releases/tag/0.11.13-dev.2

@victorlunam
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victorlunam commented Sep 28, 2025

I agree that this would be an acceptable tradeoff to ensure stability. Although, where are you seeing that swizzle() is causing a crash? Can you provide a backtrace? As far as I've seen, most known crashes in macOS 26 are caused by NSWindow.windowNumber returning a larger value than what CGWindowID (aka UInt32) can contain, which wasn't the case in prior macOS versions.

Do you still get crashes when using the latest beta build? https://github.com/jordanbaird/Ice/releases/tag/0.11.13-dev.2

Regarding point 2.
I just tried the latest beta version and it works fine.

Regarding point 1.
I'm sharing the error message with you.

Full Report on crash (click to expand) 
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process:             Ice [1289]
Path:                /Applications/Ice.app/Contents/MacOS/Ice
Identifier:          com.jordanbaird.Ice
Version:             0.11.12 (1117)
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           com.jordanbaird.Ice [839]
User ID:             501

Date/Time:           2025-09-28 08:07:41.6337 -0500
Launch Time:         2025-09-28 08:07:01.7394 -0500
Hardware Model:      Mac15,6
OS Version:          macOS 26.0 (25A354)
Release Type:        User

Crash Reporter Key:  4957A7C6-FA0B-9382-DFC0-9CA399EFCDB3
Incident Identifier: 5E61D346-056E-4D5F-A425-073393474D03

Sleep/Wake UUID:       1A51E81D-ED06-4AFB-9D66-8CCA559EA18D

Time Awake Since Boot: 170 seconds
Time Since Wake:       148 seconds

System Integrity Protection: enabled

Triggered by Thread: 0

Exception Type:    EXC_BREAKPOINT (SIGTRAP)
Exception Codes:   0x0000000000000001, 0x0000000100e38934

Termination Reason:  Namespace SIGNAL, Code 5, Trace/BPT trap: 5
Terminating Process: exc handler [1289]


Thread 0 Crashed:
0   Ice                           	       0x100e38934 0x100e2c000 + 51508
1   Ice                           	       0x100eeeb18 0x100e2c000 + 797464
2   Ice                           	       0x100eeeaa0 0x100e2c000 + 797344
3   Ice                           	       0x100eed5e0 0x100e2c000 + 792032
4   Ice                           	       0x100eac7e1 0x100e2c000 + 526305
5   Ice                           	       0x100e4c151 0x100e2c000 + 131409
6   Ice                           	       0x100e4ffb9 0x100e2c000 + 147385
7   Ice                           	       0x100e3e319 0x100e2c000 + 74521
8   libswift_Concurrency.dylib    	       0x27ac18dfd completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1

Thread 1:

Thread 2:

Thread 3:

Thread 4:: com.apple.NSEventThread
0   libsystem_kernel.dylib        	       0x1824d1c34 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x1824e4028 mach_msg2_internal + 76
2   libsystem_kernel.dylib        	       0x1824da98c mach_msg_overwrite + 484
3   libsystem_kernel.dylib        	       0x1824d1fb4 mach_msg + 24
4   CoreFoundation                	       0x1825b3c80 __CFRunLoopServiceMachPort + 160
5   CoreFoundation                	       0x1825b25d8 __CFRunLoopRun + 1188
6   CoreFoundation                	       0x182670898 _CFRunLoopRunSpecificWithOptions + 532
7   AppKit                        	       0x186a30a68 _NSEventThread + 184
8   libsystem_pthread.dylib       	       0x182514c08 _pthread_start + 136
9   libsystem_pthread.dylib       	       0x18250fba8 thread_start + 8

Thread 5:

Thread 6:

Thread 7:

Thread 8:

Thread 9:


Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x000000074406a800   x1: 0x21000001eef137bf   x2: 0x00000001eef137b8   x3: 0x0000000000000001
    x4: 0x0000001000000003   x5: 0x0000000000000007   x6: 0x0000001000000003   x7: 0x0000000000000007
    x8: 0x0000000000000001   x9: 0x00000001fdca4ebb  x10: 0x00000007563e7903  x11: 0x00000000000003ff
  x12: 0x0000000000000226  x13: 0x0000000745052250  x14: 0x21000001eef137bf  x15: 0x00000001eef137b8
  x16: 0x21000001eef137bf  x17: 0x0000000000000040  x18: 0x0000000000000000  x19: 0x0000000100000000
  x20: 0x000000074406a800  x21: 0x0000000744838b40  x22: 0x0000000744088640  x23: 0x0000000000000002
  x24: 0x0000000100fd5000  x25: 0x0000000744bf4900  x26: 0x000000074634e550  x27: 0x00000007467de4c0
  x28: 0xffffffff76ffffff   fp: 0x000000016efcf8b0   lr: 0x0000000100e38928
    sp: 0x000000016efcf890   pc: 0x0000000100e38934 cpsr: 0x60001000
  far: 0x0000000000000000  esr: 0xf2000001 (Breakpoint) brk 1

Binary Images:
      0x100e2c000 -        0x100fbbfff com.jordanbaird.Ice (0.11.12) <438423db-718a-3fc0-9935-2a5721737382> /Applications/Ice.app/Contents/MacOS/Ice
      0x101114000 -        0x101157fff org.sparkle-project.Sparkle (2.6.4) <0e273e3e-459c-3fa6-9a86-4754c5cc30ff> /Applications/Ice.app/Contents/Frameworks/Sparkle.framework/Versions/B/Sparkle
      0x1013c8000 -        0x1013d3fff libobjc-trampolines.dylib (*) <580e4b29-8304-342d-a21c-2a869364dc35> /usr/lib/libobjc-trampolines.dylib
      0x115294000 -        0x115ab7fff com.apple.AGXMetalG15X-M1 (340.26.3) <034c331a-3023-3000-8004-26d3a9da5ef1> /System/Library/Extensions/AGXMetalG15X_M1.bundle/Contents/MacOS/AGXMetalG15X_M1
      0x27abab000 -        0x27ac35317 libswift_Concurrency.dylib (*) <55c416d8-c572-3449-9302-a64cc8a57360> /usr/lib/swift/libswift_Concurrency.dylib
              0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
      0x1824d1000 -        0x18250d45f libsystem_kernel.dylib (*) <2eb73bf1-8c71-3e1f-a160-6da83dc82606> /usr/lib/system/libsystem_kernel.dylib
      0x182554000 -        0x182aa0f7f com.apple.CoreFoundation (6.9) <edb39786-80b1-3bff-b6c3-e33f2e3ca867> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
      0x186981000 -        0x18807cd9f com.apple.AppKit (6.9) <6d84c7a3-ee98-3daf-ac66-cd95a902ba84> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
      0x18250e000 -        0x18251aabb 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=1.8G resident=0K(0%) swapped_out_or_unallocated=1.8G(100%)
Writable regions: Total=164.5M written=577K(0%) resident=577K(0%) swapped_out=0K(0%) unallocated=164.0M(100%)

                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Accelerate framework               128K        1 
Activity Tracing                   256K        1 
AttributeGraph Data               1024K        1 
CG image                           128K        8 
ColorSync                          624K       29 
CoreAnimation                     4816K       77 
CoreGraphics                        48K        3 
CoreGraphics (reserved)             16K        1         reserved VM address space (unallocated)
CoreUI image data                 2368K       18 
Foundation                          16K        1 
Kernel Alloc Once                   32K        1 
MALLOC                           141.5M       30 
MALLOC guard page                 3440K        4 
STACK GUARD                       56.2M       10 
Stack                             12.8M       10 
VM_ALLOCATE                       3216K       10 
__AUTH                            5805K      649 
__AUTH_CONST                      88.5M     1034 
__CTF                               824        1 
__DATA                            29.7M      984 
__DATA_CONST                      32.9M     1043 
__DATA_DIRTY                      8873K      895 
__FONT_DATA                        2352        1 
__INFO_FILTER                         8        1 
__LINKEDIT                       596.0M        5 
__OBJC_RO                         78.1M        1 
__OBJC_RW                         2561K        1 
__TEXT                             1.2G     1066 
__TPRO_CONST                       128K        2 
mapped file                      299.1M       44 
page table in kernel               577K        1 
shared memory                     1968K       19 
===========                     =======  ======= 
TOTAL                              2.5G     5952 
TOTAL, minus reserved VM space     2.5G     5952 


-----------
Full Report
-----------

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  "uptime" : 170,
  "procRole" : "Foreground",
  "version" : 2,
  "userID" : 501,
  "deployVersion" : 210,
  "modelCode" : "Mac15,6",
  "coalitionID" : 839,
  "osVersion" : {
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    "build" : "25A354",
    "releaseType" : "User"
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  "captureTime" : "2025-09-28 08:07:41.6337 -0500",
  "codeSigningMonitor" : 2,
  "incident" : "5E61D346-056E-4D5F-A425-073393474D03",
  "pid" : 1289,
  "translated" : false,
  "cpuType" : "ARM-64",
  "roots_installed" : 0,
  "bug_type" : "309",
  "procLaunch" : "2025-09-28 08:07:01.7394 -0500",
  "procStartAbsTime" : 3285579876,
  "procExitAbsTime" : 4243066350,
  "procName" : "Ice",
  "procPath" : "\/Applications\/Ice.app\/Contents\/MacOS\/Ice",
  "bundleInfo" : {"CFBundleShortVersionString":"0.11.12","CFBundleVersion":"1117","CFBundleIdentifier":"com.jordanbaird.Ice"},
  "storeInfo" : {"deviceIdentifierForVendor":"56449518-9F6D-5979-A8D0-C384DC29EDAE","thirdParty":true},
  "parentProc" : "launchd",
  "parentPid" : 1,
  "coalitionName" : "com.jordanbaird.Ice",
  "crashReporterKey" : "4957A7C6-FA0B-9382-DFC0-9CA399EFCDB3",
  "developerMode" : 1,
  "codeSigningID" : "com.jordanbaird.Ice",
  "codeSigningTeamID" : "K2ATHQPJDP",
  "codeSigningFlags" : 570503953,
  "codeSigningValidationCategory" : 6,
  "codeSigningTrustLevel" : 4294967295,
  "codeSigningAuxiliaryInfo" : 0,
  "instructionByteStream" : {"beforePC":"6AwAsAGpQPngAxSqvucElPMDAKrgAxSqxOcElLMB+Ldo\/mDTiAAAtA==","atPC":"IAAg1BMAgNIoAIBS6DMAOQgdABJgggiq\/XtCqfRPQan\/wwCRwANf1g=="},
  "bootSessionUUID" : "5C576A41-5FC5-4169-9402-40BD2EAE8679",
  "wakeTime" : 148,
  "sleepWakeUUID" : "1A51E81D-ED06-4AFB-9D66-8CCA559EA18D",
  "sip" : "enabled",
  "exception" : {"codes":"0x0000000000000001, 0x0000000100e38934","rawCodes":[1,4309879092],"type":"EXC_BREAKPOINT","signal":"SIGTRAP"},
  "termination" : {"flags":0,"code":5,"namespace":"SIGNAL","indicator":"Trace\/BPT trap: 5","byProc":"exc handler","byPid":1289},
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  "extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
  "faultingThread" : 0,
  "threads" : 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Model: Mac15,6, BootROM 13822.1.2, proc 11:5:6 processors, 18 GB, SMC 
Graphics: Apple M3 Pro, Apple M3 Pro, Built-In
Display: Color LCD, 3024 x 1964 Retina, Main, MirrorOff, Online
Memory Module: LPDDR5, Micron
AirPort: spairport_wireless_card_type_wifi (0x14E4, 0x4388), wl0: Jul 23 2025 02:15:12 version 23.41.4.0.41.51.197 FWID 01-673dce38
IO80211_driverkit-1525.88 "IO80211_driverkit-1525.88" Aug  6 2025 21:19:03
AirPort: 
Bluetooth: Version (null), 0 services, 0 devices, 0 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Thunderbolt Bus: MacBook Pro, Apple Inc.
Thunderbolt Bus: MacBook Pro, Apple Inc.
Thunderbolt Bus: MacBook Pro, Apple Inc.

@jordanbaird
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jordanbaird commented Sep 29, 2025

Looks like this is indeed the window number issue I described above. Here's the important part of the crash report (emphasis mine):

{"value":8303753144,"symbolLocation":0,"symbol":"OBJC_CLASS_$_NSStatusBarWindow"},{"value":1},{"value":68719476739},{"value":7},{"value":68719476739},{"value":7},{"value":1},{"value":8552861371,"objc-selector":"windowNumber"}

If disabling swizzling happens to prevent a crash on your machine, it's likely coincidental, and could come down to something as simple as an order-of-execution issue. Since this technically falls under the category of "undefined behavior", it might not even prevent a crash 100% of the time.

As stated, this has been fixed in the latest beta. Work for this is being done on the macos-26 branch, and will be merged into main once a few final things are worked out. I don't think there's anything to do here, but thanks for the contribution regardless!

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@victorlunam @jordanbaird