FineTune 1.8.0 crashes when adjusting LG HDR 4K display volume, while BlackHole volume works normally #364

nextofsearch · 2026-07-05T03:22:42Z

nextofsearch
Jul 5, 2026

Hi, I’m seeing a reproducible crash in FineTune when adjusting the volume of my LG HDR 4K display audio output.

Environment

FineTune version: 1.8.0 (37)
Mac: Mac Studio
macOS: 15.7.7 Sequoia
Display / audio output device: LG HDR 4K
Display connection: USB-C to DisplayPort cable
Output devices shown in FineTune:
Mac Studio Speakers
BlackHole 2ch
LG HDR 4K

What happens

Changing the volume of BlackHole 2ch works normally. However, when I adjust the volume slider for LG HDR 4K, FineTune immediately crashes/quits. So the issue seems specific to the LG HDR 4K display audio output, not volume adjustment in general.

Steps to reproduce

Connect the LG HDR 4K display to the Mac Studio using a USB-C to DisplayPort cable.
Open FineTune.
Make sure LG HDR 4K is available as an output device.
Adjust the volume slider for LG HDR 4K.
FineTune immediately crashes.

Expected behavior

FineTune should adjust the LG HDR 4K display volume without crashing.

Actual behavior

FineTune crashes immediately after changing the LG HDR 4K volume.

Additional test

I tested changing the volume of BlackHole 2ch, and that works fine. The crash only happens when changing LG HDR 4K.

Thank you for the great software.

Translated Report (Full Report Below)

Process: FineTune [60366]
Path: /Applications/FineTune.app/Contents/MacOS/FineTune
Identifier: com.finetuneapp.FineTune
Version: 1.8.0 (37)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
User ID: 501

Date/Time: 2026-07-05 12:05:05.3179 +0900
OS Version: macOS 15.7.7 (24G720)
Report Version: 12
Anonymous UUID: 0ECAC7A3-F126-7C56-EBDF-40A7029375F7

Time Awake Since Boot: 300000 seconds

System Integrity Protection: enabled

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

Exception Type: EXC_CRASH (SIGTRAP)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Termination Reason: Namespace SIGNAL, Code 5 Trace/BPT trap: 5
Terminating Process: FineTune [60366]

Thread 0 Crashed:: Dispatch 0 libsystem_kernel.dylib 1 libsystem_kernel.dylib 2 libsystem_kernel.dylib 3 libsystem_kernel.dylib 4 CoreFoundation 5 CoreFoundation 6 CoreFoundation 7 HIToolbox 8 HIToolbox 9 HIToolbox 10 AppKit 11 AppKit 12 AppKit 13 AppKit 14 AppKit 15 AppKit 16 AppKit 17 AppKit 18 AppKit 19 AppKit 20 AppKit 21 AppKit 22 AppKit 23 AppKit 24 AppKit 25 SwiftUI 26 SwiftUI 27 SwiftUI 28 FineTune 29 dyld queue: com.apple.main-thread
0x189819c34 mach_msg2_trap + 8
0x18982c338 mach_msg2_internal + 76
0x189822764 mach_msg_overwrite + 484
0x189819fa8 mach_msg + 24
0x189946c0c __CFRunLoopServiceMachPort + 160
0x189945528 __CFRunLoopRun + 1208
0x1899449e8 CFRunLoopRunSpecific + 572
0x1953ea27c RunCurrentEventLoopInMode + 324
0x1953ed4e8 ReceiveNextEventCommon + 676
0x195578484 _BlockUntilNextEventMatchingListInModeWithFilter + 76
0x18d865a34 _DPSNextEvent + 684
0x18e2045cc -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
0x18da03668 -[NSWindow(NSEventRouting) trackEventsMatchingMask:timeout:mode:handler:] + 212
0x18da02a24 -[NSDragEventTracker trackEvent:usingHandler:] + 1224
0x18da01ed0 NSControlTrackMouse + 1088
0x18da01a64 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 144
0x18db35fdc -[NSSliderCell trackMouse:inRect:ofView:untilMouseUp:] + 124
0x18da00d88 -[NSControl mouseDown:] + 492
0x18d9ffbe4 -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 3664
0x18d98bc54 -[NSWindow(NSEventRouting) reallySendEvent:isDelayedEvent:] + 492
0x18d98b8a0 -[NSWindow(NSEventRouting) sendEvent:] + 288
0x18e20334c -[NSApplication(NSEventRouting) sendEvent:] + 1504
0x18de0242c -[NSApplication handleEvent:] + 60
0x18d858c0c -[NSApplication run] + 520
0x18d82f2dc NSApplicationMain + 880
0x1b96f1878 specialized runApp(:) + 160
0x1b9b4f658 runApp(:) + 108
0x1b9eb05c0 static App.main() + 224
0x1011663fc 0x100f98000 + 1893372
0x1894bab98 start + 6076

Thread 1:: caulk.messenger.shared:17
0 libsystem_kernel.dylib 0x189819bb0 semaphore_wait_trap + 8
1 caulk 0x194ed1cc8 caulk::semaphore::timed_wait(double) + 224
2 caulk 0x194ed1b70 caulk::concurrent::details::worker_thread::run() + 32
3 caulk 0x194ed1844 void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::)(), std::__1::tuplecaulk::concurrent::details::worker_thread*>>(void) + 96
4 libsystem_pthread.dylib 0x18985bbc8 _pthread_start + 136
5 libsystem_pthread.dylib 0x189856b80 thread_start + 8

Thread 2:: caulk.messenger.shared:high
0 libsystem_kernel.dylib 0x189819bb0 semaphore_wait_trap + 8
1 caulk 0x194ed1cc8 caulk::semaphore::timed_wait(double) + 224
2 caulk 0x194ed1b70 caulk::concurrent::details::worker_thread::run() + 32
3 caulk 0x194ed1844 void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::)(), std::__1::tuplecaulk::concurrent::details::worker_thread*>>(void) + 96
4 libsystem_pthread.dylib 0x18985bbc8 _pthread_start + 136
5 libsystem_pthread.dylib 0x189856b80 thread_start + 8

Thread 3:: com.apple.NSEventThread
0 libsystem_kernel.dylib 0x189819c34 mach_msg2_trap + 8
1 libsystem_kernel.dylib 0x18982c338 mach_msg2_internal + 76
2 libsystem_kernel.dylib 0x189822764 mach_msg_overwrite + 484
3 libsystem_kernel.dylib 0x189819fa8 mach_msg + 24
4 CoreFoundation 0x189946c0c __CFRunLoopServiceMachPort + 160
5 CoreFoundation 0x189945528 __CFRunLoopRun + 1208
6 CoreFoundation 0x1899449e8 CFRunLoopRunSpecific + 572
7 AppKit 0x18d98978c _NSEventThread + 140
8 libsystem_pthread.dylib 0x18985bbc8 _pthread_start + 136
9 libsystem_pthread.dylib 0x189856b80 thread_start + 8

Thread 4:: com.apple.audio.IOThread.client
0 libsystem_kernel.dylib 0x189819bbc semaphore_wait_signal_trap + 8
1 caulk 0x194eee2f8 caulk::mach::semaphore::wait_signal_or_error(caulk::mach::semaphore&) + 36
2 CoreAudio 0x18c74b69c HALC_ProxyIOContext::IOWorkLoop() + 5276
3 CoreAudio 0x18c749aec invocation function for block in HALC_ProxyIOContext::HALC_ProxyIOContext(unsigned int, unsigned int) + 172
4 CoreAudio 0x18c8f4088 HALC_IOThread::Entry(void*) + 88
5 libsystem_pthread.dylib 0x18985bbc8 _pthread_start + 136
6 libsystem_pthread.dylib 0x189856b80 thread_start + 8

Thread 5:
0 libsystem_pthread.dylib 0x189856b6c start_wqthread + 0

Thread 6:
0 libsystem_pthread.dylib 0x189856b6c start_wqthread + 0

Thread 7:: Dispatch queue: com.finetune.ddc
0 libsystem_kernel.dylib 0x189821da4 __kill + 8
1 libsystem_platform.dylib 0x1898956a4 _sigtramp + 56
2 libdispatch.dylib 0x1896a7580 _dispatch_assert_queue_fail + 112
3 libdispatch.dylib 0x1896d97b4 dispatch_assert_queue$V2.cold.1 + 116
4 libdispatch.dylib 0x1896a750c dispatch_assert_queue + 108
5 libswift_Concurrency.dylib 0x27202a3e8 swift_task_isCurrentExecutorWithFlagsImpl(swift::SerialExecutorRef, swift::swift_task_is_current_executor_flag) + 288
6 FineTune 0x100fae0c4 0x100f98000 + 90308
7 FineTune 0x100fae2e8 0x100f98000 + 90856
8 libdispatch.dylib 0x1896b3338 _dispatch_block_async_invoke2 + 148
9 libdispatch.dylib 0x1896bd85c _dispatch_client_callout + 16
10 libdispatch.dylib 0x1896a85e0 _dispatch_continuation_pop + 596
11 libdispatch.dylib 0x1896bb620 _dispatch_source_latch_and_call + 396
12 libdispatch.dylib 0x1896ba2f8 _dispatch_source_invoke + 844
13 libdispatch.dylib 0x1896ac1b8 _dispatch_lane_serial_drain + 332
14 libdispatch.dylib 0x1896ace2c _dispatch_lane_invoke + 388
15 libdispatch.dylib 0x1896b7264 _dispatch_root_queue_drain_deferred_wlh + 292
16 libdispatch.dylib 0x1896b6ae8 _dispatch_workloop_worker_thread + 540
17 libsystem_pthread.dylib 0x189857e20 _pthread_wqthread + 292
18 libsystem_pthread.dylib 0x189856b74 start_wqthread + 8

Thread 8:
0 libsystem_pthread.dylib 0x189856b6c start_wqthread + 0

Thread 9:
0 libsystem_pthread.dylib 0x189856b6c start_wqthread + 0

Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000010004005 x1: 0x0000000507000806 x2: 0x0000000200000000 x3: 0x0001530300000000
x4: 0x0000000000000000 x5: 0x0001530300000000 x6: 0x0000000000000002 x7: 0x00000000ffffffff
x8: 0x0000000000000000 x9: 0x0000000400000000 x10: 0x0000000000000000 x11: 0x0000000000000002
x12: 0x0000000000000000 x13: 0x0000000000000000 x14: 0x0000000000015303 x15: 0x0000000000000000
x16: 0xffffffffffffffd1 x17: 0x00000001f8859c60 x18: 0x0000000000000000 x19: 0x00000000ffffffff
x20: 0x0000000000000002 x21: 0x0001530300000000 x22: 0x0000000000000000 x23: 0x0001530300000000
x24: 0x000000016ee65358 x25: 0x0000000200000000 x26: 0x0000000507000806 x27: 0xfffffffffffffbbf
x28: 0x0000000107000806 fp: 0x000000016ee652c0 lr: 0x000000018982c338
sp: 0x000000016ee65270 pc: 0x0000000189819c34 cpsr: 0x00001000
far: 0x0000000000000000 esr: 0x56000080 Address size fault

Binary Images:
0x100f98000 - 0x101217fff com.finetuneapp.FineTune (1.8.0) <6d924c23-ce55-346d-9148-511d60defb4a> /Applications/FineTune.app/Contents/MacOS/FineTune
0x10136c000 - 0x1013b3fff org.sparkle-project.Sparkle (2.8.1) /Applications/FineTune.app/Contents/Frameworks/Sparkle.framework/Versions/B/Sparkle
0x10e040000 - 0x10e04bfff libobjc-trampolines.dylib () <9a87f143-aa9d-3c46-b2e8-b3fb9215e33e> /usr/lib/libobjc-trampolines.dylib
0x1129c0000 - 0x113057fff com.apple.AGXMetalG13X (329.2) <6733e964-3c7f-32b7-a652-fb5aa4d2f2c7> /System/Library/Extensions/AGXMetalG13X.bundle/Contents/MacOS/AGXMetalG13X
0x10ffec000 - 0x10ffeffff com.apple.applescript.component (2.8) /System/Library/Components/AppleScript.component/Contents/MacOS/AppleScript
0x115f7c000 - 0x115fa3fff com.apple.osax.standardadditions (2.8) /System/Library/ScriptingAdditions/StandardAdditions.osax/Contents/MacOS/StandardAdditions
0x189819000 - 0x1898545f3 libsystem_kernel.dylib () /usr/lib/system/libsystem_kernel.dylib
0x1898ca000 - 0x189e08fff com.apple.CoreFoundation (6.9) <3c6d108b-7a9e-3020-84e7-823ad9129ae5> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x195327000 - 0x19562dfdf com.apple.HIToolbox (2.1.1) <7537dc6d-3280-335e-9259-ed5d308d29ec> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
0x18d82b000 - 0x18ecbb75f com.apple.AppKit (6.9) <33d86abe-3911-31e8-8574-72d3319c0ee4> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x1b96a9000 - 0x1badd041f com.apple.SwiftUI (6.5.4) <20a22d4f-7c44-3b84-929a-b83cb311c984> /System/Library/Frameworks/SwiftUI.framework/Versions/A/SwiftUI
0x1894b4000 - 0x18954f57b dyld () <70dbd61b-24cf-3e2b-aed9-1d345967d2d4> /usr/lib/dyld
0x0 - 0xffffffffffffffff ??? () <00000000-0000-0000-0000-000000000000> ???
0x194ed0000 - 0x194ef7ddf com.apple.audio.caulk (1.0) /System/Library/PrivateFrameworks/caulk.framework/Versions/A/caulk
0x189855000 - 0x189861a77 libsystem_pthread.dylib () <2886f4f3-500b-36c8-a20c-c457eb754e3d> /usr/lib/system/libsystem_pthread.dylib
0x18c558000 - 0x18cc8a17f com.apple.audio.CoreAudio (5.0) <9c6e6aee-f626-30c3-8e58-09febcb8d460> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio
0x189892000 - 0x189899e0b libsystem_platform.dylib () /usr/lib/system/libsystem_platform.dylib
0x1896a2000 - 0x1896e875f libdispatch.dylib () <63a54ce1-2ab6-3673-82e4-d8489d811475> /usr/lib/system/libdispatch.dylib
0x271fcc000 - 0x27204cc63 libswift_Concurrency.dylib () <2565be0c-1131-3228-b73d-fdd2f7c2e346> /usr/lib/swift/libswift_Concurrency.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=1.6G resident=0K(0%) swapped_out_or_unallocated=1.6G(100%)
Writable regions: Total=2.0G written=867K(0%) resident=771K(0%) swapped_out=96K(0%) unallocated=2.0G(100%)

                            VIRTUAL   REGION

REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Accelerate framework 128K 1
Activity Tracing 256K 1
AttributeGraph Data 1024K 1
CG image 960K 18
ColorSync 656K 33
CoreAnimation 1712K 84
CoreGraphics 48K 3
CoreServices 624K 2
CoreUI image data 4224K 30
Foundation 16K 1
Kernel Alloc Once 32K 1
MALLOC 2.0G 107
MALLOC guard page 480K 30
Mach message 1264K 4
SQLite page cache 128K 1
STACK GUARD 56.2M 10
Stack 12.8M 10
VM_ALLOCATE 3456K 17
__AUTH 5368K 687
__AUTH_CONST 76.0M 929
__CTF 824 1
__DATA 25.2M 910
__DATA_CONST 26.9M 942
__DATA_DIRTY 2763K 337
__FONT_DATA 2352 1
__INFO_FILTER 8 1
__LINKEDIT 618.8M 7
__OBJC_RO 61.4M 1
__OBJC_RW 2397K 1
__TEXT 1.0G 962
__TPRO_CONST 128K 2
libnetwork 640K 16
mapped file 244.0M 56
page table in kernel 771K 1
shared memory 2784K 16
=========== ======= =======
TOTAL 4.1G 5224

Full Report

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{
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"version" : 2,
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"coalitionID" : 42873,
"osVersion" : {
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"build" : "24G720",
"releaseType" : "User"
},
"captureTime" : "2026-07-05 12:05:05.3179 +0900",
"codeSigningMonitor" : 1,
"incident" : "49F7348B-945B-41A1-961F-B506BF9958F3",
"pid" : 60366,
"translated" : false,
"cpuType" : "ARM-64",
"roots_installed" : 0,
"bug_type" : "309",
"procLaunch" : "2026-07-04 21:10:21.8697 +0900",
"procStartAbsTime" : 5936783652749,
"procExitAbsTime" : 7225236277606,
"procName" : "FineTune",
"procPath" : "/Applications/FineTune.app/Contents/MacOS/FineTune",
"bundleInfo" : {"CFBundleShortVersionString":"1.8.0","CFBundleVersion":"37","CFBundleIdentifier":"com.finetuneapp.FineTune"},
"storeInfo" : {"deviceIdentifierForVendor":"EC5719DD-50EB-5A71-93F6-241059423D52","thirdParty":true},
"parentProc" : "launchd",
"parentPid" : 1,
"coalitionName" : "com.finetuneapp.FineTune",
"crashReporterKey" : "0ECAC7A3-F126-7C56-EBDF-40A7029375F7",
"appleIntelligenceStatus" : {"state":"available"},
"codeSigningID" : "com.finetuneapp.FineTune",
"codeSigningTeamID" : "MA94NC8B2C",
"codeSigningFlags" : 570503953,
"codeSigningValidationCategory" : 6,
"codeSigningTrustLevel" : 4294967295,
"codeSigningAuxiliaryInfo" : 0,
"instructionByteStream" : {"beforePC":"ARAA1MADX9aQBYCSARAA1MADX9awBYCSARAA1MADX9bQBYCSARAA1A==","atPC":"wANf1vAFgJIBEADUwANf1hAGgJIBEADUwANf1jAGgJIBEADUwANf1g=="},
"bootSessionUUID" : "5D5810B6-47FE-43E6-AE9F-33BFAFCAE209",
"sip" : "enabled",
"exception" : {"codes":"0x0000000000000000, 0x0000000000000000","rawCodes":[0,0],"type":"EXC_CRASH","signal":"SIGTRAP"},
"termination" : {"flags":0,"code":5,"namespace":"SIGNAL","indicator":"Trace/BPT trap: 5","byProc":"FineTune","byPid":60366},
"os_fault" : {"process":"FineTune"},
"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" : [{"triggered":true,"id":4897714,"threadState":{"x":[{"value":268451845},{"value":21592279046},{"value":8589934592},{"value":372747326717952},{"value":0},{"value":372747326717952},{"value":2},{"value":4294967295},{"value":0},{"value":17179869184},{"value":0},{"value":2},{"value":0},{"value":0},{"value":86787},{"value":0},{"value":18446744073709551569},{"value":8464473184},{"value":0},{"value":4294967295},{"value":2},{"value":372747326717952},{"value":0},{"value":372747326717952},{"value":6155555672},{"value":8589934592},{"value":21592279046},{"value":18446744073709550527},{"value":4412409862}],"flavor":"ARM_THREAD_STATE64","lr":{"value":6602015544},"cpsr":{"value":4096},"fp":{"value":6155555520},"sp":{"value":6155555440},"esr":{"value":1442840704,"description":" Address size 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ronitsingh10 · 2026-07-07T00:36:40Z

ronitsingh10
Jul 7, 2026
Maintainer

Thanks for the detailed crash report — the full trace made this easy to pin down.

Root cause: the v1.8.0 migration to Swift 6 language mode caused the debounced DDC-write closure in DDCController.setVolume to inherit @MainActor isolation. When the write ran on the background com.finetune.ddc queue, the runtime executor check trapped — the _dispatch_assert_queue_fail frames in your report. Any volume change on a DDC-controlled monitor hit this; BlackHole was unaffected because it isn't controlled via DDC.

Fixed in #361, just merged. The fix will ship in the next release — until then, the only workaround is to avoid adjusting the monitor's volume from FineTune.

0 replies

nextofsearch · 2026-07-08T01:31:13Z

nextofsearch
Jul 8, 2026
Author

Thank you so much! I appreciate it.

0 replies

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FineTune 1.8.0 crashes when adjusting LG HDR 4K display volume, while BlackHole volume works normally #364

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FineTune 1.8.0 crashes when adjusting LG HDR 4K display volume, while BlackHole volume works normally #364

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nextofsearch Jul 5, 2026

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Replies: 2 comments

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ronitsingh10 Jul 7, 2026 Maintainer

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nextofsearch Jul 8, 2026 Author

nextofsearch
Jul 5, 2026

ronitsingh10
Jul 7, 2026
Maintainer

nextofsearch
Jul 8, 2026
Author