🐞 Loop crashes quietly

[yusrmuttaqien]

Bug Description

Loop seems to randomly crashes, noticed only when tried to arranging windows and Loop didn't respond to the keybinds

Affected Scope

Crash / Freeze

Steps to Reproduce

1. Launch Loop
2. Wait for undefined time
3. After sometimes, wanted to arranging window, Loop already crashes

Reproducibility

Always

Expected vs Actual Behavior

Loop should be stable and always running, I'm not apply any kind of resource limiter to Loop

Screen Recordings / Screenshots

No response

Severity

Critical (major functionality broken)

macOS Version

Tahoe 26.4

Loop Version

1.4.2 (1693)

Did You Try the Development Build?

No

Additional Context

Crash Log

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process:             Loop [29225]
Path:                /Applications/Loop.app/Contents/MacOS/Loop
Identifier:          com.MrKai77.Loop
Version:             1.4.2 (1693)
Code Type:           ARM-64 (Native)
Role:                Default
Parent Process:      launchd [1]
Coalition:           com.MrKai77.Loop [3366]
User ID:             501

Date/Time:           2026-05-05 17:43:53.4038 +0700
Launch Time:         2026-05-05 07:38:21.0681 +0700
Hardware Model:      MacBookAir10,1
OS Version:          macOS 26.4 (25E246)
Release Type:        User

Crash Reporter Key:  9E9FA28A-EB47-F241-A873-B945113E5880
Incident Identifier: EBD4CA17-EF7E-450E-9C99-17B10B5F7C93

Sleep/Wake UUID:       DBEA9D5D-680D-4CAB-852D-EB557C499425

Time Awake Since Boot: 48000 seconds
Time Since Wake:       11873 seconds

System Integrity Protection: enabled

Triggered by Thread: 5, Dispatch Queue: com.apple.root.user-initiated-qos.cooperative

Exception Type:    EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x8000000000000010 -> 0x0000000000000010 (possible pointer authentication failure)
Exception Codes:   0x0000000000000001, 0x8000000000000010

Termination Reason:  Namespace SIGNAL, Code 11, Segmentation fault: 11
Terminating Process: exc handler [29225]


VM Region Info: 0x10 is not in any region.  Bytes before following region: 4367187952
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      __TEXT                      1044e0000-104848000    [ 3488K] r-x/r-x SM=COW  /Applications/Loop.app/Contents/MacOS/Loop

Thread 0::  Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	       0x188edbc34 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x188eee574 mach_msg2_internal + 76
2   libsystem_kernel.dylib        	       0x188ee49c0 mach_msg_overwrite + 480
3   libsystem_kernel.dylib        	       0x188edbfc0 mach_msg + 24
4   SkyLight                      	       0x18f924874 __SLSSetFrontProcessWithInfo_block_invoke + 204
5   SkyLight                      	       0x18faae39c CGSPropertyListPerformWithSerializedBytes + 88
6   SkyLight                      	       0x18f924750 SLSSetFrontProcessWithInfo + 524
7   AppKit                        	       0x18e295590 -[NSRunningApplication activateWithOptions:] + 632
8   Loop                          	       0x10463150c 0x1044e0000 + 1381644
9   Loop                          	       0x1045c02a0 0x1044e0000 + 918176
10  Loop                          	       0x1044e4995 0x1044e0000 + 18837
11  Loop                          	       0x104605c65 0x1044e0000 + 1203301
12  Loop                          	       0x1044e4995 0x1044e0000 + 18837
13  libswift_Concurrency.dylib    	       0x28cfeeec5 completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1

Thread 1:: com.apple.NSEventThread
0   libsystem_kernel.dylib        	       0x188edbc34 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x188eee574 mach_msg2_internal + 76
2   libsystem_kernel.dylib        	       0x188ee49c0 mach_msg_overwrite + 480
3   libsystem_kernel.dylib        	       0x188edbfc0 mach_msg + 24
4   SkyLight                      	       0x18f70c920 CGSSnarfAndDispatchDatagrams + 168
5   SkyLight                      	       0x18f88541c SLSGetNextEventRecordInternal + 296
6   SkyLight                      	       0x18f7ff7c0 SLEventCreateNextEvent + 20
7   HIToolbox                     	       0x195daaecc PullEventsFromWindowServerOnConnection(unsigned int, unsigned char, __CFMachPortBoost*) + 80
8   HIToolbox                     	       0x195da8248 MessageHandler(__CFMachPort*, void*, long, void*) + 60
9   CoreFoundation                	       0x189007e14 __CFMachPortPerform + 240
10  CoreFoundation                	       0x188fdd138 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 60
11  CoreFoundation                	       0x188fdd060 __CFRunLoopDoSource1 + 504
12  CoreFoundation                	       0x188fdba28 __CFRunLoopRun + 2168
13  CoreFoundation                	       0x1890adbe0 _CFRunLoopRunSpecificWithOptions + 532
14  AppKit                        	       0x18d528c64 _NSEventThread + 184
15  libsystem_pthread.dylib       	       0x188f1fc58 _pthread_start + 136
16  libsystem_pthread.dylib       	       0x188f1ac1c thread_start + 8

Thread 2:

Thread 3:

Thread 4:

Thread 5 Crashed::  Dispatch queue: com.apple.root.user-initiated-qos.cooperative
0   Loop                          	       0x104653468 0x1044e0000 + 1520744
1   Loop                          	       0x104653464 0x1044e0000 + 1520740
2   Loop                          	       0x104632d7c 0x1044e0000 + 1387900
3   Loop                          	       0x1044e4995 0x1044e0000 + 18837
4   libswift_Concurrency.dylib    	       0x28cfeeec5 completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1

Thread 6::  Dispatch queue: com.apple.root.user-initiated-qos.cooperative
0   Loop                          	       0x1045d60d0 0x1044e0000 + 1007824
1   Loop                          	       0x1046534fc 0x1044e0000 + 1520892
2   Loop                          	       0x104632d7c 0x1044e0000 + 1387900
3   Loop                          	       0x1044e4995 0x1044e0000 + 18837
4   libswift_Concurrency.dylib    	       0x28cfeeec5 completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1

Thread 7:

Thread 8:

Thread 9:


Thread 5 crashed with ARM Thread State (64-bit):
    x0: 0x0000000000000001   x1: 0x000000016bb4acd8   x2: 0x0000000104653464   x3: 0x0000000104884ca0
    x4: 0x0000000000000020   x5: 0x0000000000000000   x6: 0x0000000000000001   x7: 0x0000000000000000
    x8: 0xa79708a282210030   x9: 0xa79708a282210030  x10: 0x00000009ef473c72  x11: 0x000000000000001f
   x12: 0x0000000000000015  x13: 0x0000000ae84d7b40  x14: 0x030000010486f1e9  x15: 0x000000010486f1e8
   x16: 0x000000019c5aebd0  x17: 0x0000000000000004  x18: 0x0000000000000000  x19: 0x0000000104884ca0
   x20: 0x8000000000000000  x21: 0x0000000ae907e440  x22: 0x0000000000000a43  x23: 0x0000000104633924
   x24: 0x000000010486f1e8  x25: 0x000000010487b000  x26: 0x000000010487b000  x27: 0x00000002a1af2020
   x28: 0x0000000000000000   fp: 0x000000016bb4ad80   lr: 0x0000000104653464
    sp: 0x000000016bb4acd0   pc: 0x0000000104653468 cpsr: 0x60001000
   far: 0x8000000000000010  esr: 0x92000006 (Data Abort) byte read Translation fault

Binary Images:
       0x1044e0000 -        0x104847fff com.MrKai77.Loop (1.4.2) <fab19e57-cbf5-36af-bc8f-bd9329dc4545> /Applications/Loop.app/Contents/MacOS/Loop
       0x104c44000 -        0x104c4ffff libobjc-trampolines.dylib (*) <a4dd56f1-375a-3540-844b-5e397f0b78b3> /usr/lib/libobjc-trampolines.dylib
       0x118904000 -        0x11908ffff com.apple.AGXMetal13-3 (350.38) <3ba9342a-9728-3cc7-9881-ea09be475f28> /System/Library/Extensions/AGXMetal13_3.bundle/Contents/MacOS/AGXMetal13_3
       0x188edb000 -        0x188f1828f libsystem_kernel.dylib (*) <51565b39-f595-3e96-a217-fef29815057a> /usr/lib/system/libsystem_kernel.dylib
       0x18f702000 -        0x18fcb6b5f com.apple.SkyLight (1.600.0) <ef82be18-450b-33fe-9c68-a2c88144f367> /System/Library/PrivateFrameworks/SkyLight.framework/Versions/A/SkyLight
       0x18d3ce000 -        0x18eaf0abf com.apple.AppKit (6.9) <59e23bd5-d01e-305a-b96f-a5790356049a> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
       0x28cfe2000 -        0x28d06d095 libswift_Concurrency.dylib (*) <02634765-cb69-3c2b-9cce-10103cbea22a> /usr/lib/swift/libswift_Concurrency.dylib
               0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
       0x195cf3000 -        0x195fee05f com.apple.HIToolbox (2.1.1) <bcb81496-c81f-3d3e-a617-ccca047989e0> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
       0x188f5f000 -        0x1894bcc5f com.apple.CoreFoundation (6.9) <04941709-2330-3bf8-9213-6d33964db448> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
       0x188f19000 -        0x188f25b3b libsystem_pthread.dylib (*) <e7a73008-0c09-31e3-9dd9-0c61652f0e85> /usr/lib/system/libsystem_pthread.dylib
       0x19c5ab000 -        0x19cb4c93f libswiftCore.dylib (*) <fb6ad37d-0f92-3774-ab61-0323db22c111> /usr/lib/swift/libswiftCore.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=254.2M written=770K(0%) resident=642K(0%) swapped_out=128K(0%) unallocated=253.5M(100%)

                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Accelerate framework               128K        1 
Activity Tracing                   256K        1 
AttributeGraph Data               1024K        1 
CG image                           208K        5 
ColorSync                           64K        4 
CoreAnimation                      480K       30 
CoreGraphics                        32K        2 
CoreServices                       624K        2 
CoreUI image data                 5120K       17 
Foundation                          48K        2 
Kernel Alloc Once                   32K        1 
MALLOC                           153.8M       76 
MALLOC guard page                 3552K        4 
Memory Tag 22                     64.0M        1 
SQLite page cache                  384K        3 
STACK GUARD                       56.2M       10 
Stack                             12.8M       10 
VM_ALLOCATE                       12.3M       13 
__AUTH                            6092K      643 
__AUTH_CONST                      90.2M     1033 
__CTF                               824        1 
__DATA                            34.8M      982 
__DATA_CONST                      34.8M     1040 
__DATA_DIRTY                      8466K      889 
__FONT_DATA                        2352        1 
__LINKEDIT                       575.1M        4 
__OBJC_RO                         79.1M        1 
__OBJC_RW                         2597K        1 
__TEXT                             1.2G     1063 
__TPRO_CONST                       128K        2 
mapped file                      290.0M       54 
page table in kernel               642K        1 
shared memory                     9056K       16 
===========                     =======  ======= 
TOTAL                              2.6G     5914 


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

{"app_name":"Loop","timestamp":"2026-05-05 17:43:59.00 +0700","app_version":"1.4.2","slice_uuid":"fab19e57-cbf5-36af-bc8f-bd9329dc4545","build_version":"1693","platform":1,"bundleID":"com.MrKai77.Loop","share_with_app_devs":0,"is_first_party":0,"bug_type":"309","os_version":"macOS 26.4 (25E246)","roots_installed":0,"name":"Loop","incident_id":"EBD4CA17-EF7E-450E-9C99-17B10B5F7C93"}
{
  "uptime" : 48000,
  "procRole" : "Default",
  "version" : 2,
  "userID" : 501,
  "deployVersion" : 210,
  "modelCode" : "MacBookAir10,1",
  "coalitionID" : 3366,
  "osVersion" : {
    "train" : "macOS 26.4",
    "build" : "25E246",
    "releaseType" : "User"
  },
  "captureTime" : "2026-05-05 17:43:53.4038 +0700",
  "codeSigningMonitor" : 1,
  "incident" : "EBD4CA17-EF7E-450E-9C99-17B10B5F7C93",
  "pid" : 29225,
  "translated" : false,
  "cpuType" : "ARM-64",
  "procLaunch" : "2026-05-05 07:38:21.0681 +0700",
  "procStartAbsTime" : 332555820715,
  "procExitAbsTime" : 1170319092691,
  "procName" : "Loop",
  "procPath" : "\/Applications\/Loop.app\/Contents\/MacOS\/Loop",
  "bundleInfo" : {"CFBundleShortVersionString":"1.4.2","CFBundleVersion":"1693","CFBundleIdentifier":"com.MrKai77.Loop"},
  "storeInfo" : {"deviceIdentifierForVendor":"DE1E3C61-119A-5343-9F08-A1A36F0B7C48","thirdParty":true},
  "parentProc" : "launchd",
  "parentPid" : 1,
  "coalitionName" : "com.MrKai77.Loop",
  "crashReporterKey" : "9E9FA28A-EB47-F241-A873-B945113E5880",
  "appleIntelligenceStatus" : {"state":"available"},
  "developerMode" : 1,
  "bootProgressRegister" : "0x2f000000",
  "codeSigningID" : "com.MrKai77.Loop",
  "codeSigningTeamID" : "5F967GYF84",
  "codeSigningFlags" : 570520337,
  "codeSigningValidationCategory" : 6,
  "codeSigningTrustLevel" : 4294967295,
  "codeSigningAuxiliaryInfo" : 0,
  "instructionByteStream" : {"beforePC":"IQgAVHYaQLmTEQCwc4IykeEjAJHgAxOqAgSAUgMAgNJzbwWUdAJA+Q==","atPC":"iApA+egBALTgAxaqwQL7l4EBADaIHkD5FHlg+OAjAJG3bwWU4AMUqg=="},
  "bootSessionUUID" : "6AA574FF-C68F-4B64-BCA7-53953B7B65B9",
  "wakeTime" : 11873,
  "sleepWakeUUID" : "DBEA9D5D-680D-4CAB-852D-EB557C499425",
  "sip" : "enabled",
  "vmRegionInfo" : "0x10 is not in any region.  Bytes before following region: 4367187952\n      REGION TYPE                    START - END         [ VSIZE] PRT\/MAX SHRMOD  REGION DETAIL\n      UNUSED SPACE AT START\n--->  \n      __TEXT                      1044e0000-104848000    [ 3488K] r-x\/r-x SM=COW  \/Applications\/Loop.app\/Contents\/MacOS\/Loop",
  "exception" : {"codes":"0x0000000000000001, 0x8000000000000010","rawCodes":[1,-9223372036854775792],"type":"EXC_BAD_ACCESS","signal":"SIGSEGV","subtype":"KERN_INVALID_ADDRESS at 0x8000000000000010 -> 0x0000000000000010 (possible pointer authentication failure)"},
  "termination" : {"flags":0,"code":11,"namespace":"SIGNAL","indicator":"Segmentation fault: 11","byProc":"exc handler","byPid":29225},
  "vmregioninfo" : "0x10 is not in any region.  Bytes before following region: 4367187952\n      REGION TYPE                    START - END         [ VSIZE] PRT\/MAX SHRMOD  REGION DETAIL\n      UNUSED SPACE AT START\n--->  \n      __TEXT                      1044e0000-104848000    [ 3488K] r-x\/r-x SM=COW  \/Applications\/Loop.app\/Contents\/MacOS\/Loop",
  "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" : 5,
  "threads" : 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Final Checks

• My issue is written in English.
• My issue title is descriptive.
• This is a single bug (multiple bugs should be reported individually).
• I have looked to see if this is a duplicate of another bug report.
• I can help with further investigation.
• I can help with developing a fix for this issue.

[mrkai77]

Thank you for reporting this, @yusrmuttaqien. The crash log was very helpful :)
Would you be able to test this build and let me know whether Loop still crashes quietly?
Loop.zip

[s-atwood]

I started noticing the same thing. Same behavior with it just silently crashing. Noticed it more when using the stash feature but could just be coincidence.

[mrkai77]

@s-atwood I’d really appreciate it if you could also test the build attached above too! What you’re describing does make sense, as my main suspicion is that the crash is caused by threading issues related to window movement animations, which stashing relies on heavily.

[yusrmuttaqien]

Thanks for the response @mrkai77 . I've tried both the development version (downloaded from toggle in the public version) and the zip file. Both works well and stable.

One thing though in these two versions. Stashing changes the window dimension despite preserve size is being set. This problem doesn't exist in the public version if I recall correctly

[mrkai77]

@yusrmuttaqien you are correct, I’ve now implemented a fix for that issue as well. Here's a build with the fix included, on top of the fix for this issue: Loop.zip

[yusrmuttaqien]

Just tried the latest zip, It fixes the dimension issue. But, the Stash feature itself become way less responsive. It took seconds for stashed window to peek out, and when cursor is out of the peeked out stash window, it doesn't go back to stashed state, only switches focus to other non-stashed window (also took seconds)

[mrkai77]

@yusrmuttaqien I see, I’ve now added caching along with some additional performance improvements to stashing behavior. Could you try this build and let me know how it feels? Loop.zip

[yusrmuttaqien]

Sorry for the delayed response. I've been testing the stability of your latest ZIP file for the past few days, and I'm confirming that Loop is now stable and as fast as before, and the stashed feature is now consistent.

Thanks for the fixes, @mrkai77.