DrRacket crashes w/mutation while enumeration
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Description
I'm still on 8.7 until the end of the semester. That is, I know, outdated, but I couldn't find an existing matching issue. I don't have a good repo example, but I triggered it roughly by opening DrRacket w/a bunch of CS1 assignments and interacting with the first couple. These submissions were generally using image and universe. Some were using the htdp hashlangs, others not.
In one of the only other issues I saw that had Scall in their crash repo, in the discussion someone else mentions their related issue occurring with multiple tabs open (though I'm unclear how related this is.) Don't know if this is helpful.
2023-05-15 15:55:15.732 DrRacket[27045:9438166] *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSArrayM: 0x600003833570> was mutated while being enumerated.'
*** First throw call stack:
(
0 CoreFoundation 0x00000001bde11148 __exceptionPreprocess + 240
1 libobjc.A.dylib 0x00000001bdb5be04 objc_exception_throw + 60
2 CoreFoundation 0x00000001bde9c9bc -[__NSSingleObjectEnumerator init] + 0
3 AppKit 0x00000001c09c5538 NSViewUpdateVibrancyForSubtree + 212
4 AppKit 0x00000001c09c5544 NSViewUpdateVibrancyForSubtree + 224
5 AppKit 0x00000001c09c5544 NSViewUpdateVibrancyForSubtree + 224
6 AppKit 0x00000001c09c5360 -[NSWindow displayIfNeeded] + 208
7 ??? 0x00000001341baa10 0x0 + 5169195536
8 ??? 0x000000010cf8b55c 0x0 + 4512593244
9 CoreFoundation 0x00000001bde29bb8 ___CFXRegistrationPost_block_invoke + 52
10 CoreFoundation 0x00000001bde29b24 _CFXRegistrationPost + 456
11 CoreFoundation 0x00000001bdd540f8 _CFXNotificationPost + 732
12 Foundation 0x00000001bec19c28 -[NSNotificationCenter postNotificationName:object:userInfo:] + 96
13 AppKit 0x00000001c0949208 -[NSWindow _setFrameCommon:display:fromServer:] + 3284
14 AppKit 0x00000001c0947eac -[NSThemeFrame setStyleMask:] + 632
15 AppKit 0x00000001c0947930 __25-[NSWindow setStyleMask:]_block_invoke + 1396
16 AppKit 0x00000001c0947360 NSPerformVisuallyAtomicChange + 140
17 AppKit 0x00000001c0947260 -[NSWindow setStyleMask:] + 200
18 AppKit 0x00000001c0bf0bc8 -[NSWindow(NSSheets) _setSheet:] + 148
19 AppKit 0x00000001c0ba7470 -[NSApplication _commonBeginModalSessionForWindow:relativeToWindow:modalDelegate:didEndSelector:contextInfo:] + 1096
20 ??? 0x000000029d8e260c 0x0 + 11233273356
21 DrRacket 0x000000010438c808 Scall2 + 120
22 DrRacket 0x00000001042fcbbc racket_boot + 1512
23 DrRacket 0x00000001042fc4d8 main + 1788
24 dyld 0x000000010734d08c start + 520
)
libc++abi: terminating with uncaught exception of type NSException
Abort trap: 6
Full report below
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process: DrRacket [27045]
Path: /Applications/Racket v8.7/*/DrRacket.app/Contents/MacOS/DrRacket
Identifier: org.racket-lang.DrRacket
Version: 8.7 (8.7)
Code Type: ARM-64 (Native)
Parent Process: bash [25604]
Responsible: Emacs [29253]
User ID: 501
Date/Time: 2023-05-15 15:55:15.7666 -0400
OS Version: macOS 12.6 (21G115)
Report Version: 12
Anonymous UUID: D3C23952-0418-C538-6B42-5297EE8A94A1
Sleep/Wake UUID: 288F40DA-E17D-4AF9-AA08-5EB529AD5F2D
Time Awake Since Boot: 490000 seconds
Time Since Wake: 20403 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Application Specific Information:
abort() called
Application Specific Backtrace 0:
0 CoreFoundation 0x00000001bde11148 __exceptionPreprocess + 240
1 libobjc.A.dylib 0x00000001bdb5be04 objc_exception_throw + 60
2 CoreFoundation 0x00000001bde9c9bc -[__NSSingleObjectEnumerator init] + 0
3 AppKit 0x00000001c09c5538 NSViewUpdateVibrancyForSubtree + 212
4 AppKit 0x00000001c09c5544 NSViewUpdateVibrancyForSubtree + 224
5 AppKit 0x00000001c09c5544 NSViewUpdateVibrancyForSubtree + 224
6 AppKit 0x00000001c09c5360 -[NSWindow displayIfNeeded] + 208
7 ??? 0x00000001341baa10 0x0 + 5169195536
8 ??? 0x000000010cf8b55c 0x0 + 4512593244
9 CoreFoundation 0x00000001bde29bb8 ___CFXRegistrationPost_block_invoke + 52
10 CoreFoundation 0x00000001bde29b24 _CFXRegistrationPost + 456
11 CoreFoundation 0x00000001bdd540f8 _CFXNotificationPost + 732
12 Foundation 0x00000001bec19c28 -[NSNotificationCenter postNotificationName:object:userInfo:] + 96
13 AppKit 0x00000001c0949208 -[NSWindow _setFrameCommon:display:fromServer:] + 3284
14 AppKit 0x00000001c0947eac -[NSThemeFrame setStyleMask:] + 632
15 AppKit 0x00000001c0947930 __25-[NSWindow setStyleMask:]_block_invoke + 1396
16 AppKit 0x00000001c0947360 NSPerformVisuallyAtomicChange + 140
17 AppKit 0x00000001c0947260 -[NSWindow setStyleMask:] + 200
18 AppKit 0x00000001c0bf0bc8 -[NSWindow(NSSheets) _setSheet:] + 148
19 AppKit 0x00000001c0ba7470 -[NSApplication _commonBeginModalSessionForWindow:relativeToWindow:modalDelegate:didEndSelector:contextInfo:] + 1096
20 ??? 0x000000029d8e260c 0x0 + 11233273356
21 DrRacket 0x000000010438c808 Scall2 + 120
22 DrRacket 0x00000001042fcbbc racket_boot + 1512
23 DrRacket 0x00000001042fc4d8 main + 1788
24 dyld 0x000000010734d08c start + 520
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x1bdc8ed98 __pthread_kill + 8
1 libsystem_pthread.dylib 0x1bdcc3ee0 pthread_kill + 288
2 libsystem_c.dylib 0x1bdbfe340 abort + 168
3 libc++abi.dylib 0x1bdc7eb08 abort_message + 132
4 libc++abi.dylib 0x1bdc6e950 demangling_terminate_handler() + 336
5 libobjc.A.dylib 0x1bdb64320 _objc_terminate() + 144
6 libc++abi.dylib 0x1bdc7dea4 std::__terminate(void (*)()) + 20
7 libc++abi.dylib 0x1bdc80c1c __cxxabiv1::failed_throw(__cxxabiv1::__cxa_exception*) + 36
8 libc++abi.dylib 0x1bdc80bc8 __cxa_throw + 140
9 libobjc.A.dylib 0x1bdb5bf6c objc_exception_throw + 420
10 CoreFoundation 0x1bde9c9bc __NSFastEnumerationMutationHandler + 172
11 AppKit 0x1c09c5538 NSViewUpdateVibrancyForSubtree + 212
12 AppKit 0x1c09c5544 NSViewUpdateVibrancyForSubtree + 224
13 AppKit 0x1c09c5544 NSViewUpdateVibrancyForSubtree + 224
14 AppKit 0x1c09c5360 -[NSWindow displayIfNeeded] + 208
15 ??? 0x1341baa10 ???
16 ??? 0x10cf8b55c ???
17 CoreFoundation 0x1bde29bb8 ___CFXRegistrationPost_block_invoke + 52
18 CoreFoundation 0x1bde29b24 _CFXRegistrationPost + 456
19 CoreFoundation 0x1bdd540f8 _CFXNotificationPost + 732
20 Foundation 0x1bec19c28 -[NSNotificationCenter postNotificationName:object:userInfo:] + 96
21 AppKit 0x1c0949208 -[NSWindow _setFrameCommon:display:fromServer:] + 3284
22 AppKit 0x1c0947eac -[NSThemeFrame setStyleMask:] + 632
23 AppKit 0x1c0947930 __25-[NSWindow setStyleMask:]_block_invoke + 1396
24 AppKit 0x1c0947360 NSPerformVisuallyAtomicChange + 140
25 AppKit 0x1c0947260 -[NSWindow setStyleMask:] + 200
26 AppKit 0x1c0bf0bc8 -[NSWindow(NSSheets) _setSheet:] + 148
27 AppKit 0x1c0ba7470 -[NSApplication _commonBeginModalSessionForWindow:relativeToWindow:modalDelegate:didEndSelector:contextInfo:] + 1096
28 ??? 0x29d8e260c ???
29 DrRacket 0x10438c808 Scall2 + 120
30 DrRacket 0x1042fcbbc racket_boot + 1512
31 DrRacket 0x1042fc4d8 main + 1788
32 dyld 0x10734d08c start + 520
Thread 1:: com.apple.CFSocket.private
0 libsystem_kernel.dylib 0x1bdc91598 __select + 8
1 CoreFoundation 0x1bddbb808 __CFSocketManager + 644
2 libsystem_pthread.dylib 0x1bdcc426c _pthread_start + 148
3 libsystem_pthread.dylib 0x1bdcbf08c thread_start + 8
Thread 2:: com.apple.NSEventThread
0 libsystem_kernel.dylib 0x1bdc868b0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1bdc86d20 mach_msg + 76
2 CoreFoundation 0x1bdd91210 __CFRunLoopServiceMachPort + 372
3 CoreFoundation 0x1bdd8f6c0 __CFRunLoopRun + 1180
4 CoreFoundation 0x1bdd8ea84 CFRunLoopRunSpecific + 600
5 AppKit 0x1c0a63100 _NSEventThread + 196
6 libsystem_pthread.dylib 0x1bdcc426c _pthread_start + 148
7 libsystem_pthread.dylib 0x1bdcbf08c thread_start + 8
Thread 3:
0 libsystem_kernel.dylib 0x1bdc91f10 __sigwait + 8
1 libsystem_pthread.dylib 0x1bdcc4a48 sigwait + 40
2 DrRacket 0x1043c3468 thread_signal_worker + 120
3 libsystem_pthread.dylib 0x1bdcc426c _pthread_start + 148
4 libsystem_pthread.dylib 0x1bdcbf08c thread_start + 8
Thread 4:
0 libsystem_kernel.dylib 0x1bdc8a270 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x1bdcc483c _pthread_cond_wait + 1236
2 DrRacket 0x1043c10f8 do_background_sleep + 88
3 libsystem_pthread.dylib 0x1bdcc426c _pthread_start + 148
4 libsystem_pthread.dylib 0x1bdcbf08c thread_start + 8
Thread 5:
0 libsystem_kernel.dylib 0x1bdc8a270 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x1bdcc483c _pthread_cond_wait + 1236
2 DrRacket 0x1043c2fa0 getaddrinfo_in_thread + 72
3 libsystem_pthread.dylib 0x1bdcc426c _pthread_start + 148
4 libsystem_pthread.dylib 0x1bdcbf08c thread_start + 8
Thread 6:
0 libsystem_kernel.dylib 0x1bdc91598 __select + 8
1 DrRacket 0x1043c06d4 rktio_sleep + 1020
2 ??? 0x10994d61c ???
3 DrRacket 0x10438c880 Scall0 + 100
4 DrRacket 0x10438dc74 start_thread + 60
5 libsystem_pthread.dylib 0x1bdcc426c _pthread_start + 148
6 libsystem_pthread.dylib 0x1bdcbf08c thread_start + 8
Thread 7:
0 libsystem_kernel.dylib 0x1bdc8a270 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x1bdcc483c _pthread_cond_wait + 1236
2 DrRacket 0x104337728 start_sweeper + 100
3 libsystem_pthread.dylib 0x1bdcc426c _pthread_start + 148
4 libsystem_pthread.dylib 0x1bdcbf08c thread_start + 8
Thread 8:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 9:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 10:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 11:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 12:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 13:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 14:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 15:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 16:
0 libsystem_pthread.dylib 0x1bdcbf078 start_wqthread + 0
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x00000001bdc820f5 x5: 0x000000016bb031a0 x6: 0x000000000000006e x7: 0x0000000000000001
x8: 0xadca3475d4eb2f55 x9: 0xadca3474d3d72ad5 x10: 0x0000000000000200 x11: 0x000000000000000b
x12: 0x000000000000000b x13: 0x00000001be1d22ed x14: 0x00000001bdc8211b x15: 0x0000000000000000
x16: 0x0000000000000148 x17: 0x0000000217de7680 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x00000001073c0580 x21: 0x0000000000000103 x22: 0x00000001073c0660 x23: 0x000000015680f560
x24: 0x0000000109833dd0 x25: 0x00000002d54b7ce0 x26: 0x0000000135010dfd x27: 0x0000000000001400
x28: 0x0000000000000000 fp: 0x000000016bb03110 lr: 0x00000001bdcc3ee0
sp: 0x000000016bb030f0 pc: 0x00000001bdc8ed98 cpsr: 0x40001000
far: 0x00000001308cc000 esr: 0x56000080 Address size fault
Binary Images:
0x1bdc85000 - 0x1bdcbcfff libsystem_kernel.dylib (*) <a9d87740-9c1d-3468-bf60-720a8d713cba> /usr/lib/system/libsystem_kernel.dylib
0x1bdcbd000 - 0x1bdcc9fff libsystem_pthread.dylib (*) <63c4eef9-69a5-38b1-996e-8d31b66a051d> /usr/lib/system/libsystem_pthread.dylib
0x1bdb84000 - 0x1bdc05fff libsystem_c.dylib (*) <b25d2080-bb9e-38d6-8236-9cef4b2f11a3> /usr/lib/system/libsystem_c.dylib
0x1bdc6d000 - 0x1bdc84fff libc++abi.dylib (*) <4e8d8a11-4217-3d56-9d41-5426f7cf307c> /usr/lib/libc++abi.dylib
0x1bdb43000 - 0x1bdb80fff libobjc.A.dylib (*) <ec96f0fa-6341-3e1d-be54-49b544e17f7d> /usr/lib/libobjc.A.dylib
0x1bdd0c000 - 0x1be252fff com.apple.CoreFoundation (6.9) <fc3c193d-0cdb-3569-9f0e-bd2507ca1dbb> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x1c08b5000 - 0x1c176dfff com.apple.AppKit (6.9) <5e432f87-5b58-391a-a542-fa2d909dd210> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
0x1bec10000 - 0x1bf001fff com.apple.Foundation (6.9) <8bbf8f9b-0034-34f0-a2c5-13c31941632d> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x1042f8000 - 0x1043d3fff org.racket-lang.DrRacket (8.7) <50c2fc4b-5173-33e8-8c52-a2b97e7eb644> /Applications/Racket v8.7/DrRacket.app/Contents/MacOS/DrRacket
0x107348000 - 0x1073a7fff dyld (*) <38ee9fe9-b66d-3066-8c5c-6ddf0d6944c6> /usr/lib/dyld
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=853.0M resident=0K(0%) swapped_out_or_unallocated=853.0M(100%)
Writable regions: Total=3.5G written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=3.5G(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Accelerate framework 640K 5
Activity Tracing 256K 1
CG backing stores 4032K 4
CG image 624K 22
ColorSync 624K 27
CoreAnimation 114.0M 181
CoreGraphics 32K 2
CoreUI image data 3296K 23
Foundation 64K 2
Kernel Alloc Once 32K 1
MALLOC 444.2M 124
MALLOC guard page 192K 10
MALLOC_MEDIUM (reserved) 1.1G 10 reserved VM address space (unallocated)
MALLOC_NANO (reserved) 384.0M 1 reserved VM address space (unallocated)
SQLite page cache 256K 4
STACK GUARD 54.7M 17
Stack 18.1M 17
VM_ALLOCATE 1.4G 1061
__AUTH 1942K 192
__AUTH_CONST 11.3M 349
__CTF 756 1
__DATA 10.2M 359
__DATA_CONST 13.0M 373
__DATA_DIRTY 976K 121
__FONT_DATA 4K 1
__GLSLBUILTINS 5176K 1
__LINKEDIT 580.2M 27
__OBJC_CONST 1985K 162
__OBJC_RO 83.0M 1
__OBJC_RW 3168K 1
__TEXT 272.8M 387
__UNICODE 592K 1
dyld private memory 1024K 1
mapped file 426.0M 36
shared memory 1376K 15
=========== ======= =======
TOTAL 4.9G 3540
TOTAL, minus reserved VM space 3.5G 3540
-----------
Full Report
-----------
{"app_name":"DrRacket","timestamp":"2023-05-15 15:55:17.00 -0400","app_version":"8.7","slice_uuid":"50c2fc4b-5173-33e8-8c52-a2b97e7eb644","build_version":"8.7","platform":1,"bundleID":"org.racket-lang.DrRacket","share_with_app_devs":1,"is_first_party":0,"bug_type":"309","os_version":"macOS 12.6 (21G115)","incident_id":"40DA731B-4F2D-4B9A-8FC6-0BB9CE9BA015","name":"DrRacket"}
{
"uptime" : 490000,
"procLaunch" : "2023-05-15 14:14:32.5895 -0400",
"procRole" : "Foreground",
"version" : 2,
"userID" : 501,
"deployVersion" : 210,
"modelCode" : "MacBookPro18,2",
"procStartAbsTime" : 11850820872154,
"coalitionID" : 137760,
"osVersion" : {
"train" : "macOS 12.6",
"build" : "21G115",
"releaseType" : "User"
},
"captureTime" : "2023-05-15 15:55:15.7666 -0400",
"incident" : "40DA731B-4F2D-4B9A-8FC6-0BB9CE9BA015",
"bug_type" : "309",
"pid" : 27045,
"procExitAbsTime" : 11995856586713,
"translated" : false,
"cpuType" : "ARM-64",
"procName" : "DrRacket",
"procPath" : "\/Applications\/Racket v8.7\/*\/DrRacket.app\/Contents\/MacOS\/DrRacket",
"bundleInfo" : {"CFBundleShortVersionString":"8.7","CFBundleVersion":"8.7","CFBundleIdentifier":"org.racket-lang.DrRacket"},
"storeInfo" : {"deviceIdentifierForVendor":"5366DCD1-A398-51ED-9D91-0060AF875883","thirdParty":true},
"parentProc" : "bash",
"parentPid" : 25604,
"coalitionName" : "org.gnu.Emacs",
"crashReporterKey" : "D3C23952-0418-C538-6B42-5297EE8A94A1",
"responsiblePid" : 29253,
"responsibleProc" : "Emacs",
"wakeTime" : 20403,
"sleepWakeUUID" : "288F40DA-E17D-4AF9-AA08-5EB529AD5F2D",
"sip" : "enabled",
"isCorpse" : 1,
"exception" : {"codes":"0x0000000000000000, 0x0000000000000000","rawCodes":[0,0],"type":"EXC_CRASH","signal":"SIGABRT"},
"asi" : {"libsystem_c.dylib":["abort() called"]},
"asiBacktraces" : ["0 CoreFoundation 0x00000001bde11148 __exceptionPreprocess + 240\n1 libobjc.A.dylib 0x00000001bdb5be04 objc_exception_throw + 60\n2 CoreFoundation 0x00000001bde9c9bc -[__NSSingleObjectEnumerator init] + 0\n3 AppKit 0x00000001c09c5538 NSViewUpdateVibrancyForSubtree + 212\n4 AppKit 0x00000001c09c5544 NSViewUpdateVibrancyForSubtree + 224\n5 AppKit 0x00000001c09c5544 NSViewUpdateVibrancyForSubtree + 224\n6 AppKit 0x00000001c09c5360 -[NSWindow displayIfNeeded] + 208\n7 ??? 0x00000001341baa10 0x0 + 5169195536\n8 ??? 0x000000010cf8b55c 0x0 + 4512593244\n9 CoreFoundation 0x00000001bde29bb8 ___CFXRegistrationPost_block_invoke + 52\n10 CoreFoundation 0x00000001bde29b24 _CFXRegistrationPost + 456\n11 CoreFoundation 0x00000001bdd540f8 _CFXNotificationPost + 732\n12 Foundation 0x00000001bec19c28 -[NSNotificationCenter postNotificationName:object:userInfo:] + 96\n13 AppKit 0x00000001c0949208 -[NSWindow _setFrameCommon:display:fromServer:] + 3284\n14 AppKit 0x00000001c0947eac -[NSThemeFrame setStyleMask:] + 632\n15 AppKit 0x00000001c0947930 __25-[NSWindow setStyleMask:]_block_invoke + 1396\n16 AppKit 0x00000001c0947360 NSPerformVisuallyAtomicChange + 140\n17 AppKit 0x00000001c0947260 -[NSWindow setStyleMask:] + 200\n18 AppKit 0x00000001c0bf0bc8 -[NSWindow(NSSheets) _setSheet:] + 148\n19 AppKit 0x00000001c0ba7470 -[NSApplication _commonBeginModalSessionForWindow:relativeToWindow:modalDelegate:didEndSelector:contextInfo:] + 1096\n20 ??? 0x000000029d8e260c 0x0 + 11233273356\n21 DrRacket 0x000000010438c808 Scall2 + 120\n22 DrRacket 0x00000001042fcbbc racket_boot + 1512\n23 DrRacket 0x00000001042fc4d8 main + 1788\n24 dyld 0x000000010734d08c start + 520"],
"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},
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Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the crash on macOS 12.6 with DrRacket 8.7, multiple assignment tabs, and the image/universe or htdp hashlang interactions described here. Compare the result with issue #550 and its multiple-tabs report; done means identifying a reproducible trigger and preventing the NSGenericException crash.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- macos
- Domain
- desktop
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100