[BUG] Claude Desktop Cowork hangs on launch and crashes on macOS 26.3.1 (Apple Silicon)
Resolved 💬 4 comments Opened Apr 13, 2026 by biffrey Closed May 27, 2026
Preflight Checklist
- [x] I have searched existing issues and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code
What's Wrong?
Claude Desktop becomes completely unresponsive when opening the Cowork tab. The app hangs with a spinning beach ball and requires a force quit. On subsequent launches, the crash handler (chrome_crashpad_handler) itself crashes immediately with an EXC_BREAKPOINT (SIGTRAP) on the main thread, preventing the app from recovering.
What Should Happen?
Claude Desktop should launch normally, and the Cowork tab should either load successfully or fail gracefully without freezing the entire application or crashing the crash handler.
Error Messages/Logs
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process: chrome_crashpad_handler [4028]
Path: /Applications/Claude.app/Contents/Frameworks/Electron Framework.framework/Versions/A/Helpers/chrome_crashpad_handler
Identifier: chrome_crashpad_handler
Version: ???
Code Type: ARM-64 (Native)
Role: Unspecified
Parent Process: launchd [1]
Coalition: com.anthropic.claudefordesktop [683]
Responsible Process: Claude [635]
User ID: 501
Date/Time: 2026-04-13 13:38:38.3023 -0400
Launch Time: 2026-04-13 13:38:38.2923 -0400
Hardware Model: Mac16,6
OS Version: macOS 26.3.1 (25D2128)
Release Type: User
Crash Reporter Key: CFC978C4-D273-E483-3465-192AE3990C73
Incident Identifier: 958DD00E-B4D9-4FA2-BB71-04F5DDAF5C1B
Time Awake Since Boot: 220 seconds
System Integrity Protection: enabled
Triggered by Thread: 0, Dispatch Queue: com.apple.main-thread
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000104d8c0d8
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 chrome_crashpad_handler 0x104d8c0d8 CrashpadHandlerMain + 137220
1 chrome_crashpad_handler 0x104d57610 logging$internal$cxxbridge1$init_rust_log_crate + 20304
2 chrome_crashpad_handler 0x104d94fc8 CrashpadHandlerMain + 173812
3 chrome_crashpad_handler 0x104d94fe0 CrashpadHandlerMain + 173836
4 chrome_crashpad_handler 0x104d6187c logging$internal$cxxbridge1$init_rust_log_crate + 61884
5 chrome_crashpad_handler 0x104d6b798 CrashpadHandlerMain + 3780
6 chrome_crashpad_handler 0x104d6a9c4 CrashpadHandlerMain + 240
7 dyld 0x1986a1d54 start + 7184
Thread 1:
0 CoreFoundation 0x198ab1338 __CFBasicHashRehash + 1712
1 CoreFoundation 0x198ab0944 __CFBasicHashAddValue + 104
2 CoreFoundation 0x198acbb00 CFBasicHashAddValue + 416
3 CoreFoundation 0x198acb8f4 CFDictionaryAddValue + 208
4 CoreServicesInternal 0x19cd2b3e0 _RegisterFilePropertyProvider + 216
5 LaunchServices 0x199002b8c _LSRegisterFilePropertyProvider + 284
6 CoreServicesInternal 0x19cd552a0 invocation function for block in initGlobalsOnce() + 416
7 libdispatch.dylib 0x1988c8ad4 _dispatch_client_callout + 16
8 libdispatch.dylib 0x1988b1a60 _dispatch_once_callout + 32
9 CoreServicesInternal 0x19cd550f8 initGlobalsOnce() + 36
10 CoreServicesInternal 0x19cd4fd28 _FileCacheGetForURL(__CFURL const*, void*) + 44
11 CoreServicesInternal 0x19cd2af6c _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) + 68
12 CoreFoundation 0x198aec7d4 CFURLCopyResourcePropertyForKey + 108
13 CoreFoundation 0x198c4d178 -[NSURL getResourceValue:forKey:error:] + 104
14 Foundation 0x19a32a518 _NSDirectoryContentsFromCFURLEnumeratorError + 120
15 Foundation 0x19a7b02c0 _FileManagerImpl.contentsOfDirectory(atPath:) + 1524
16 Foundation 0x19a7a71c4 @objc _NSFileManagerBridge.contentsOfDirectory(atPath:) + 92
17 chrome_crashpad_handler 0x104d62940 logging$internal$cxxbridge1$init_rust_log_crate + 66176
18 chrome_crashpad_handler 0x104d62860 logging$internal$cxxbridge1$init_rust_log_crate + 65952
19 chrome_crashpad_handler 0x104d68d48 logging$internal$cxxbridge1$init_rust_log_crate + 91784
20 chrome_crashpad_handler 0x104d62f98 logging$internal$cxxbridge1$init_rust_log_crate + 67800
21 chrome_crashpad_handler 0x104daed30 CrashpadHandlerMain + 279644
22 libsystem_pthread.dylib 0x198a6bc08 _pthread_start + 136
23 libsystem_pthread.dylib 0x198a66ba8 thread_start + 8
Thread 2:
0 libsystem_kernel.dylib 0x198a28bc8 semaphore_timedwait_trap + 8
1 libdispatch.dylib 0x1988e3c8c _dispatch_sema4_timedwait + 64
2 libdispatch.dylib 0x1988b0f08 _dispatch_semaphore_wait_slow + 76
3 chrome_crashpad_handler 0x104d63024 logging$internal$cxxbridge1$init_rust_log_crate + 67940
4 chrome_crashpad_handler 0x104d62fb0 logging$internal$cxxbridge1$init_rust_log_crate + 67824
5 chrome_crashpad_handler 0x104daed30 CrashpadHandlerMain + 279644
6 libsystem_pthread.dylib 0x198a6bc08 _pthread_start + 136
7 libsystem_pthread.dylib 0x198a66ba8 thread_start + 8
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000104e5a220 x1: 0x0000012800080190 x2: 0x0000000000000008 x3: 0x0000000198a729f0
x4: 0x000000016b0de780 x5: 0x0000000000000020 x6: 0x000000016b0dd510 x7: 0x0000000000000113
x8: 0x0000000000000000 x9: 0x0000000000000000 x10: 0x0000000000000000 x11: 0x0000000000000002
x12: 0x0000000000000000 x13: 0x0000000000000000 x14: 0x00000000000000c9 x15: 0x000000000000004a
x16: 0x0000000198a668cc x17: 0x0000000204d2f100 x18: 0x0000000000000000 x19: 0x00000000000000c7
x20: 0x000000016b0dedf8 x21: 0x000000016b0deb78 x22: 0x0000000104e30000 x23: 0x000000016b0debb0
x24: 0x0000000000000000 x25: 0x0000000204d318e0 x26: 0x0000000000000011 x27: 0x000000000000004c
x28: 0x00000128000800d0 fp: 0x000000016b0deb60 lr: 0x0000000104d8c014
sp: 0x000000016b0de730 pc: 0x0000000104d8c0d8 cpsr: 0x60000000
far: 0x0000000000000000 esr: 0x56000080 (Syscall)
Binary Images:
0x104d20000 - 0x104e1ffff chrome_crashpad_handler (*) <4c4c44ad-5555-3144-a1eb-59a218943577> /Applications/Claude.app/Contents/Frameworks/Electron Framework.framework/Helpers/chrome_crashpad_handler
0x198699000 - 0x198738713 dyld (*) <044cd67e-3a0a-3ca4-8bb3-a9687d5328fe> /usr/lib/dyld
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
0x198a72000 - 0x198a7a4af libsystem_platform.dylib (*) <62c9cd37-272d-3d2d-9a1c-6f4ef24f7ec7> /usr/lib/system/libsystem_platform.dylib
0x198a65000 - 0x198a71acb libsystem_pthread.dylib (*) <0596a7b6-bce2-3f06-a2e8-3eaab5371ed8> /usr/lib/system/libsystem_pthread.dylib
0x198aab000 - 0x198ff42bf com.apple.CoreFoundation (6.9) <646518bb-a6e8-3da7-ab32-9d97bcbdc25d> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x19cd2a000 - 0x19cd6a4cb com.apple.CoreServicesInternal (505) <bbd8dd43-3e71-3344-99ff-d3c698dd0305> /System/Library/PrivateFrameworks/CoreServicesInternal.framework/Versions/A/CoreServicesInternal
0x198ff5000 - 0x1993107bf com.apple.LaunchServices (1141.1) <f97a8838-1235-37f9-984e-5685fbbfb23b> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/LaunchServices
0x1988ad000 - 0x1988f3e5f libdispatch.dylib (*) <4c58ab31-f363-3e75-a8f8-302105812dbf> /usr/lib/system/libdispatch.dylib
0x19a2fe000 - 0x19b2a1c1f com.apple.Foundation (6.9) <187e7913-b154-30a7-8070-852767aac3cf> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x198a28000 - 0x198a6449f libsystem_kernel.dylib (*) <78ec33a6-6330-3836-8900-eb90836936e8> /usr/lib/system/libsystem_kernel.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=943.8M resident=0K(0%) swapped_out_or_unallocated=943.8M(100%)
Writable regions: Total=217.6M written=352K(0%) resident=352K(0%) swapped_out=0K(0%) unallocated=217.3M(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 1
Dispatch continuations 128.0M 1
Kernel Alloc Once 32K 1
MALLOC 77.0M 10
MALLOC guard page 3984K 4
Memory Tag 253 48.0G 44
STACK GUARD 56.0M 3
Stack 9264K 3
__AUTH 1720K 192
__AUTH_CONST 31.7M 405
__CTF 824 1
__DATA 6051K 361
__DATA_CONST 21.0M 407
__DATA_DIRTY 1992K 344
__FONT_DATA 2352 1
__LINKEDIT 587.4M 2
__OBJC_RO 78.4M 1
__OBJC_RW 2571K 1
__TEXT 356.4M 422
__TPRO_CONST 128K 2
mapped file 80K 1
page table in kernel 352K 1
shared memory 48K 2
=========== ======= =======
TOTAL 49.3G 2210
-----------
Full Report
-----------
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"version" : 2,
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"codeSigningTeamID" : "Q6L2SF6YDW",
"codeSigningFlags" : 570503953,
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"codeSigningTrustLevel" : 4294967295,
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"vmSummary" : "ReadOnly portion of Libraries: Total=943.8M resident=0K(0%) swapped_out_or_unallocated=943.8M(100%)\nWritable regions: Total=217.6M written=352K(0%) resident=352K(0%) swapped_out=0K(0%) unallocated=217.3M(100%)\n\n VIRTUAL REGION \nREGION TYPE SIZE COUNT (non-coalesced) \n=========== ======= ======= \nActivity Tracing 256K 1 \nDispatch continuations 128.0M 1 \nKernel Alloc Once 32K 1 \nMALLOC 77.0M 10 \nMALLOC guard page 3984K 4 \nMemory Tag 253 48.0G 44 \nSTACK GUARD 56.0M 3 \nStack 9264K 3 \n__AUTH 1720K 192 \n__AUTH_CONST 31.7M 405 \n__CTF 824 1 \n__DATA 6051K 361 \n__DATA_CONST 21.0M 407 \n__DATA_DIRTY 1992K 344 \n__FONT_DATA 2352 1 \n__LINKEDIT 587.4M 2 \n__OBJC_RO 78.4M 1 \n__OBJC_RW 2571K 1 \n__TEXT 356.4M 422 \n__TPRO_CONST 128K 2 \nmapped file 80K 1 \npage table in kernel 352K 1 \nshared memory 48K 2 \n=========== ======= ======= \nTOTAL 49.3G 2210 \n",
"legacyInfo" : {
"threadTriggered" : {
"queue" : "com.apple.main-thread"
}
},
"logWritingSignature" : "8a0c043037b1bba2822879f037d7d13d76ced45f",
"bug_type" : "309",
"roots_installed" : 0,
"trmStatus" : 1,
"trialInfo" : {
"rollouts" : [
{
"rolloutId" : "60f8ddccefea4203d95cbeef",
"factorPackIds" : [
],
"deploymentId" : 240000025
},
{
"rolloutId" : "66d35d7fe4d6bf7664f40ddf",
"factorPackIds" : [
"68c1a34bd359577bbe8f2182"
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"deploymentId" : 240000065
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],
"experiments" : [
]
}
}Steps to Reproduce
- Launch Claude Desktop
- App becomes unresponsive (spinning beach ball)
- Force quit the app
- Relaunch Claude Desktop
- chrome_crashpad_handler crashes immediately on launch (see crash report below)
Claude Model
None
Is this a regression?
Yes, this worked in a previous version
Last Working Version
_No response_
Claude Code Version
1.2278.0
Platform
Anthropic API
Operating System
macOS
Terminal/Shell
Terminal.app (macOS)
Additional Information
Troubleshooting Already Attempted
✅ Force quit and relaunch Claude Desktop
✅ Cleared ~/Library/Application Support/Claude/Cache
✅ Cleared ~/Library/Application Support/Claude/Code Cache
✅ Cleared ~/Library/Application Support/Claude/GPUCache
✅ Cleared ~/Library/Application Support/Claude/DawnGraphiteCache
✅ Cleared ~/Library/Application Support/Claude/DawnWebGPUCache
✅ Deleted VM bundle (~/Library/Application Support/Claude/claude-code-vm)
✅ Restarted Mac
❌ Issue persists after all of the above
Crash Report Summary
The crash occurs in chrome_crashpad_handler — the Electron crash reporter itself is crashing on launch:
Process: chrome_crashpad_handler (ARM-64, native)
Parent Process: launchd [1]
Responsible Process: Claude [635]
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000104d8c0d8
Faulting Thread: 0 (main thread, com.apple.main-thread)
Time Awake Since Boot: 220 seconds (crash occurs very early after boot)
Thread 0 (crashed) — main thread
0 chrome_crashpad_handler CrashpadHandlerMain + 137220
1 chrome_crashpad_handler logging$internal$cxxbridge1$init_rust_log_crate + 20304
2 chrome_crashpad_handler CrashpadHandlerMain + 173812
3 chrome_crashpad_handler CrashpadHandlerMain + 173836
4 chrome_crashpad_handler logging$internal$cxxbridge1$init_rust_log_crate + 61884
5 chrome_crashpad_handler CrashpadHandlerMain + 3780
6 chrome_crashpad_handler CrashpadHandlerMain + 240
7 dyld start + 7184
Thread 1 — background (directory enumeration)
Thread 1 was performing a contentsOfDirectory(atPath:) call via Foundation/CoreServicesInternal at crash time, suggesting possible filesystem-related initialization issues.
Possibly Related Issues
#32225 — Cowork not responding / spinning wheel on macOS 26.3
#26646 — Freezing, API 500 errors, and 12GB VM bundle causing instability on macOS 26.3
#23830 — Claude Cowork conflict with macOS 26
#25012 — Cowork session freezes during processing, leads to app crash
Impact
The app is completely unusable — both Cowork and regular Chat are inaccessible because the crash handler failure prevents the app from launching cleanly. Force quit and cache clearing do not resolve the issue.
This issue has 4 comments on GitHub. Read the full discussion on GitHub ↗