在协议见证相关问题上崩溃
Crash on a protocol witness related issue
在我的 iOS 应用程序“Progression”中很少发生崩溃（在 ~1000+ 会话中发生 1 次崩溃）我目前无法修复。消息是
Progression: protocol witness for TrainingSetSessionManager.update(object:weight:reps:) in conformance TrainingSetSessionDataManager + 40
这次崩溃让我想到了以下方法：
func update(object: TrainingSetSession, weight: Double?, reps: Int?) {
try? realm.write { // <-- crashes
if let weight = weight {
object.amountOfWeight = weight
}
if let reps = reps {
object.numberOfReps = reps
}
}
}
堆栈跟踪如下所示：
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x000000010c622340
VM Region Info: 0x10c622340 is not in any region. Bytes after previous region: 49423169 Bytes before following region: 58580160
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
mapped file 108e44000-109700000 [ 8944K] r--/r-- SM=ALI ...t_id=259b6c25
---> GAP OF 0x6700000 BYTES
MALLOC_TINY 10fe00000-10ff00000 [ 1024K] rw-/rwx SM=PRV
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [2042]
Triggered by Thread: 0
Thread 0 name:
Thread 0 Crashed:
0 Progression 0x0000000104bf0a30 0x104984000 + 2542128
1 Progression 0x0000000104c5eab0 0x104984000 + 2992816
2 Progression 0x0000000104c5da90 0x104984000 + 2988688
3 Progression 0x0000000104c5e188 0x104984000 + 2990472
4 Progression 0x0000000104c91428 0x104984000 + 3200040
5 Progression 0x0000000104caee14 0x104984000 + 3321364
6 Progression 0x0000000104cad5c8 0x104984000 + 3315144
7 Progression 0x0000000104cec258 0x104984000 + 3572312
8 Progression 0x0000000104b5605c 0x104984000 + 1908828
9 Progression 0x0000000104b5a6b0 0x104984000 + 1926832
10 Progression 0x0000000104a1f234 0x104984000 + 635444
11 Progression 0x0000000104aab410 0x104984000 + 1209360
12 Progression 0x0000000104a1f6ac 0x104984000 + 636588
13 libswiftFoundation.dylib 0x00000001a3985b3c NSFastEnumerationIterator.next() + 196 (NSFastEnumeration.swift:46)
14 Progression 0x0000000104afd344 0x104984000 + 1545028
15 libswiftCore.dylib 0x00000001a3ac7d0c Sequence._copyContents(initializing:) + 516 (Sequence.swift:1110)
16 libswiftCore.dylib 0x00000001a3ae0120 _copyCollectionToContiguousArray<A>(_:) + 604 (ContiguousArrayBuffer.swift:725)
17 Progression 0x0000000104b006e4 0x104984000 + 1558244
18 libswiftCore.dylib 0x00000001a3ad7a00 Array.init<A>(_:) + 44 (Array.swift:849)
19 Progression 0x0000000104f7fe28 0x104984000 + 6274600
20 Progression 0x0000000104f830c8 0x104984000 + 6287560
21 Progression 0x0000000104e79fac 0x104984000 + 5201836
22 Progression 0x0000000104e7a18c 0x104984000 + 5202316
23 Progression 0x0000000104ea21e8 0x104984000 + 5366248
24 Progression 0x0000000104e61798 0x104984000 + 5101464
25 Progression 0x0000000104e61878 0x104984000 + 5101688
26 Progression 0x0000000104e3cb78 0x104984000 + 4950904
27 Progression 0x0000000104e3c5ec 0x104984000 + 4949484
28 Progression 0x0000000104e85f00 0x104984000 + 5250816
29 Progression 0x0000000104f7fc74 0x104984000 + 6274164
30 Progression 0x0000000104b00ce8 0x104984000 + 1559784
31 Progression 0x0000000104b028b8 0x104984000 + 1566904
32 Progression 0x0000000104ae0c94 0x104984000 + 1428628
33 Progression 0x0000000104ae0d8c 0x104984000 + 1428876
34 Progression 0x0000000104a23428 0x104984000 + 652328
35 Progression 0x0000000104a2323c 0x104984000 + 651836
36 Progression 0x0000000104b1bd6c 0x104984000 + 1670508
37 Progression 0x0000000104b1c804 0x104984000 + 1673220
38 Progression 0x0000000104b2e1c8 0x104984000 + 1745352
39 Progression 0x0000000104b25cb0 0x104984000 + 1711280
40 Progression 0x0000000104b6d344 0x104984000 + 2003780
41 Progression 0x0000000104aa2658 0x104984000 + 1173080
42 Progression 0x0000000104afab58 0x104984000 + 1534808
43 Progression 0x0000000104999c68 TrainingSetSessionDataManager.update(object:weight:reps:) + 40 (TrainingSetSessionDataManager.swift:53)
44 Progression 0x0000000104999c68 protocol witness for TrainingSetSessionManager.update(object:weight:reps:) in conformance TrainingSetSessionDataManager + 40 (<compiler-generated>:52)
45 Progression 0x0000000104999c68 TrainingSetCell.amountOfWeight.setter + 732 (TrainingSetCell.swift:116)
46 Progression 0x000000010499b368 TrainingSetCell.setCell() + 1060 (TrainingSetCell.swift:248)
47 Progression 0x00000001049d9064 TrainingSetCell.viewModel.didset + 8 (TrainingSetCell.swift:61)
48 Progression 0x00000001049d9064 TrainingSetCell.viewModel.setter + 8 (TrainingSetCell.swift:0)
49 Progression 0x00000001049d9064 TrainingSessionViewController.tableView(_:cellForRowAt:) + 236 (TrainingSessionViewController.swift:285)
50 Progression 0x00000001049d9290 @objc TrainingSessionViewController.tableView(_:cellForRowAt:) + 140 (<compiler-generated>:0)
51 UIKitCore 0x00000001a2ae8120 -[_UIFilteredDataSource tableView:cellForRowAtIndexPath:] + 104 (_UIFilteredDataSource.m:87)
52 UIKitCore 0x00000001a2ab3168 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 644 (UITableView.m:15012)
53 UIKitCore 0x00000001a2a7ef00 -[UITableView _updateVisibleCellsNow:] + 2476 (UITableView.m:2953)
54 UIKitCore 0x00000001a2a9d310 -[UITableView layoutSubviews] + 368 (UITableView.m:9632)
55 UIKitCore 0x00000001a2dd1f84 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2504 (UIView.m:17526)
56 QuartzCore 0x00000001a32ec7b4 -[CALayer layoutSublayers] + 308 (CALayer.mm:10147)
57 QuartzCore 0x00000001a32ecc88 CA::Layer::layout_if_needed(CA::Transaction*) + 524 (CALayer.mm:10014)
58 QuartzCore 0x00000001a330147c CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 144 (CALayer.mm:2485)
59 QuartzCore 0x00000001a3246a6c CA::Context::commit_transaction(CA::Transaction*, double, double*) + 416 (CAContextInternal.mm:2449)
60 QuartzCore 0x00000001a3271f34 CA::Transaction::commit() + 732 (CATransactionInternal.mm:449)
61 QuartzCore 0x00000001a32732c4 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 96 (CATransactionInternal.mm:932)
62 CoreFoundation 0x000000019fe4c358 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36 (CFRunLoop.c:1799)
63 CoreFoundation 0x000000019fe465c4 __CFRunLoopDoObservers + 576 (CFRunLoop.c:1912)
64 CoreFoundation 0x000000019fe46b74 __CFRunLoopRun + 1056 (CFRunLoop.c:2953)
65 CoreFoundation 0x000000019fe4621c CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242)
66 GraphicsServices 0x00000001b794a784 GSEventRunModal + 164 (GSEvent.c:2259)
67 UIKitCore 0x00000001a2884fe0 -[UIApplication _run] + 1072 (UIApplication.m:3253)
68 UIKitCore 0x00000001a288a854 UIApplicationMain + 168 (UIApplication.m:4707)
69 Progression 0x000000010498ae50 main + 68 (AppDelegate.swift:14)
70 libdyld.dylib 0x000000019fb066b0 start + 4
Thread 1:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 2 name:
Thread 2:
0 libsystem_kernel.dylib 0x00000001cdc242d0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001cdc23660 mach_msg + 76 (mach_msg.c:103)
2 CoreFoundation 0x000000019fe4cc30 __CFRunLoopServiceMachPort + 380 (CFRunLoop.c:2641)
3 CoreFoundation 0x000000019fe46c14 __CFRunLoopRun + 1216 (CFRunLoop.c:2974)
4 CoreFoundation 0x000000019fe4621c CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242)
5 Foundation 0x00000001a10f5df0 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 232 (NSRunLoop.m:374)
6 Foundation 0x00000001a10f5cbc -[NSRunLoop(NSRunLoop) runUntilDate:] + 92 (NSRunLoop.m:421)
7 UIKitCore 0x00000001a2938d48 -[UIEventFetcher threadMain] + 516 (UIEventFetcher.m:838)
8 Foundation 0x00000001a1267a34 __NSThread__start__ + 864 (NSThread.m:724)
9 libsystem_pthread.dylib 0x00000001eb6a1b40 _pthread_start + 320 (pthread.c:881)
10 libsystem_pthread.dylib 0x00000001eb6aa768 thread_start + 8
Thread 3 name:
Thread 3:
0 libsystem_kernel.dylib 0x00000001cdc4a230 kevent + 8
1 Progression 0x0000000104b11c14 0x104984000 + 1629204
2 Progression 0x0000000104b125e8 0x104984000 + 1631720
3 libsystem_pthread.dylib 0x00000001eb6a1b40 _pthread_start + 320 (pthread.c:881)
4 libsystem_pthread.dylib 0x00000001eb6aa768 thread_start + 8
Thread 4 name:
Thread 4:
0 libsystem_kernel.dylib 0x00000001cdc242d0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001cdc23660 mach_msg + 76 (mach_msg.c:103)
2 CoreFoundation 0x000000019fe4cc30 __CFRunLoopServiceMachPort + 380 (CFRunLoop.c:2641)
3 CoreFoundation 0x000000019fe46c14 __CFRunLoopRun + 1216 (CFRunLoop.c:2974)
4 CoreFoundation 0x000000019fe4621c CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242)
5 AudioSession 0x00000001a79000c4 GenericRunLoopThread::Entry(void*) + 164 (GenericRunLoopThread.h:91)
6 AudioSession 0x00000001a790225c CAPThread::Entry(CAPThread*) + 92 (CAPThread.cpp:321)
7 libsystem_pthread.dylib 0x00000001eb6a1b40 _pthread_start + 320 (pthread.c:881)
8 libsystem_pthread.dylib 0x00000001eb6aa768 thread_start + 8
Thread 5:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 6:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 7:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 8:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 9:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x00000002824cb110 x1: 0x00000000009b4604 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000283ee4c48 x5: 0x0000000000000010 x6: 0x0000000000000049 x7: 0x000000020298de50
x8: 0x000000010787f320 x9: 0x0000000000000000 x10: 0x0000000000000005 x11: 0x0000000074200000
x12: 0x0000000000000038 x13: 0x0000000000000001 x14: 0x0000000000000036 x15: 0x0000000000000010
x16: 0x00000001afc27fe0 x17: 0x00000001ffad5380 x18: 0x000000011b53e89c x19: 0x00000002824cb1e0
x20: 0x00000002824cb100 x21: 0x00000002824cb1e0 x22: 0x0000000110032400 x23: 0x000000016b476040
x24: 0x0000000283ee4c48 x25: 0x000000016b4769e0 x26: 0x000000016b4768f0 x27: 0x000000020298e150
x28: 0x00000001051c10d0 fp: 0x000000016b475e70 lr: 0x0000000104c5eab0
sp: 0x000000016b475e70 pc: 0x0000000104bf0a30 cpsr: 0x60000000
esr: 0x92000006 (Data Abort) byte read Translation fault
我收到了关于这次崩溃的不同报告，有些报告显示了不同的摘要。我列出了其中的一些，堆栈跟踪总是导致我的更新功能。
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000009cc6ab0e28 -> 0x0000001cc6ab0e28 (possible pointer authentication failure)
VM Region Info: 0x1cc6ab0e28 is in 0x1000000000-0x7000000000; bytes after start: 54872706600 bytes before end: 357444153815
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
commpage (reserved) fc0000000-1000000000 [ 1.0G] ---/--- SM=NUL ...(unallocated)
---> GPU Carveout (reserved) 1000000000-7000000000 [384.0G] ---/--- SM=NUL ...(unallocated)
UNUSED SPACE AT END
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [13261]
Triggered by Thread: 0
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000c02836f4068 -> 0x00000002836f4068 (possible pointer authentication failure)
VM Region Info: 0x2836f4068 is in 0x280000000-0x2a0000000; bytes after start: 57622632 bytes before end: 479248279
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
unused shlib __TEXT 1fe08a000-1fe93c000 [ 8904K] r--/r-- SM=COW ... this process
GAP OF 0x816c4000 BYTES
---> MALLOC_NANO 280000000-2a0000000 [512.0M] rw-/rwx SM=PRV
GAP OF 0xd20000000 BYTES
commpage (reserved) fc0000000-1000000000 [ 1.0G] ---/--- SM=NUL ...(unallocated)
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [63749]
Triggered by Thread: 0
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Triggered by Thread: 0
用户可以通过按下按钮或结束编辑文本字段来触发此更新功能。我目前无法重现此崩溃。
我使用realm作为数据库，我将realm更新到最新版本，并使用了不同的版本。
有谁知道导致崩溃的原因吗？
在编辑我最初的问题以添加 Jay 提议的更多上下文时，我认为它找到了问题。
可能会发生什么？
崩溃所在的视图包含 table 视图。每个单元格将在呈现之前进行配置。如果这个单元格（它是一个力量锻炼应用程序）的重量已经初始设置或正在更改，我会使用一个保存信息的标志。调用 prepareForReuse 时，此标志尚未重置。这现在意味着滚动 table 视图会为每个重复使用的单元触发数据库写入，这会导致对数据库进行不必要的写入。不需要，因为完全相同的数字已经保存在数据库中。
我的猜测：快速滚动可能会导致竞争条件（我已经阅读了一些关于领域的问题）并且这可能会导致这种奇怪的崩溃，因为有多个短时间内启动单次写入。
解决方法：
我现在将 prepareForReuse 上的标志重置为其初始值以防止这种不当行为。
只有在设置单元格并发生所描述的行为时才会发生崩溃。因此，我非常有信心最终解决了这个问题。让我们来看看。 -- 我无法重现该问题，但这种情况也很少见。
在我的 iOS 应用程序“Progression”中很少发生崩溃（在 ~1000+ 会话中发生 1 次崩溃）我目前无法修复。消息是
Progression: protocol witness for TrainingSetSessionManager.update(object:weight:reps:) in conformance TrainingSetSessionDataManager + 40
这次崩溃让我想到了以下方法：
func update(object: TrainingSetSession, weight: Double?, reps: Int?) {
try? realm.write { // <-- crashes
if let weight = weight {
object.amountOfWeight = weight
}
if let reps = reps {
object.numberOfReps = reps
}
}
}
堆栈跟踪如下所示：
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x000000010c622340
VM Region Info: 0x10c622340 is not in any region. Bytes after previous region: 49423169 Bytes before following region: 58580160
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
mapped file 108e44000-109700000 [ 8944K] r--/r-- SM=ALI ...t_id=259b6c25
---> GAP OF 0x6700000 BYTES
MALLOC_TINY 10fe00000-10ff00000 [ 1024K] rw-/rwx SM=PRV
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [2042]
Triggered by Thread: 0
Thread 0 name:
Thread 0 Crashed:
0 Progression 0x0000000104bf0a30 0x104984000 + 2542128
1 Progression 0x0000000104c5eab0 0x104984000 + 2992816
2 Progression 0x0000000104c5da90 0x104984000 + 2988688
3 Progression 0x0000000104c5e188 0x104984000 + 2990472
4 Progression 0x0000000104c91428 0x104984000 + 3200040
5 Progression 0x0000000104caee14 0x104984000 + 3321364
6 Progression 0x0000000104cad5c8 0x104984000 + 3315144
7 Progression 0x0000000104cec258 0x104984000 + 3572312
8 Progression 0x0000000104b5605c 0x104984000 + 1908828
9 Progression 0x0000000104b5a6b0 0x104984000 + 1926832
10 Progression 0x0000000104a1f234 0x104984000 + 635444
11 Progression 0x0000000104aab410 0x104984000 + 1209360
12 Progression 0x0000000104a1f6ac 0x104984000 + 636588
13 libswiftFoundation.dylib 0x00000001a3985b3c NSFastEnumerationIterator.next() + 196 (NSFastEnumeration.swift:46)
14 Progression 0x0000000104afd344 0x104984000 + 1545028
15 libswiftCore.dylib 0x00000001a3ac7d0c Sequence._copyContents(initializing:) + 516 (Sequence.swift:1110)
16 libswiftCore.dylib 0x00000001a3ae0120 _copyCollectionToContiguousArray<A>(_:) + 604 (ContiguousArrayBuffer.swift:725)
17 Progression 0x0000000104b006e4 0x104984000 + 1558244
18 libswiftCore.dylib 0x00000001a3ad7a00 Array.init<A>(_:) + 44 (Array.swift:849)
19 Progression 0x0000000104f7fe28 0x104984000 + 6274600
20 Progression 0x0000000104f830c8 0x104984000 + 6287560
21 Progression 0x0000000104e79fac 0x104984000 + 5201836
22 Progression 0x0000000104e7a18c 0x104984000 + 5202316
23 Progression 0x0000000104ea21e8 0x104984000 + 5366248
24 Progression 0x0000000104e61798 0x104984000 + 5101464
25 Progression 0x0000000104e61878 0x104984000 + 5101688
26 Progression 0x0000000104e3cb78 0x104984000 + 4950904
27 Progression 0x0000000104e3c5ec 0x104984000 + 4949484
28 Progression 0x0000000104e85f00 0x104984000 + 5250816
29 Progression 0x0000000104f7fc74 0x104984000 + 6274164
30 Progression 0x0000000104b00ce8 0x104984000 + 1559784
31 Progression 0x0000000104b028b8 0x104984000 + 1566904
32 Progression 0x0000000104ae0c94 0x104984000 + 1428628
33 Progression 0x0000000104ae0d8c 0x104984000 + 1428876
34 Progression 0x0000000104a23428 0x104984000 + 652328
35 Progression 0x0000000104a2323c 0x104984000 + 651836
36 Progression 0x0000000104b1bd6c 0x104984000 + 1670508
37 Progression 0x0000000104b1c804 0x104984000 + 1673220
38 Progression 0x0000000104b2e1c8 0x104984000 + 1745352
39 Progression 0x0000000104b25cb0 0x104984000 + 1711280
40 Progression 0x0000000104b6d344 0x104984000 + 2003780
41 Progression 0x0000000104aa2658 0x104984000 + 1173080
42 Progression 0x0000000104afab58 0x104984000 + 1534808
43 Progression 0x0000000104999c68 TrainingSetSessionDataManager.update(object:weight:reps:) + 40 (TrainingSetSessionDataManager.swift:53)
44 Progression 0x0000000104999c68 protocol witness for TrainingSetSessionManager.update(object:weight:reps:) in conformance TrainingSetSessionDataManager + 40 (<compiler-generated>:52)
45 Progression 0x0000000104999c68 TrainingSetCell.amountOfWeight.setter + 732 (TrainingSetCell.swift:116)
46 Progression 0x000000010499b368 TrainingSetCell.setCell() + 1060 (TrainingSetCell.swift:248)
47 Progression 0x00000001049d9064 TrainingSetCell.viewModel.didset + 8 (TrainingSetCell.swift:61)
48 Progression 0x00000001049d9064 TrainingSetCell.viewModel.setter + 8 (TrainingSetCell.swift:0)
49 Progression 0x00000001049d9064 TrainingSessionViewController.tableView(_:cellForRowAt:) + 236 (TrainingSessionViewController.swift:285)
50 Progression 0x00000001049d9290 @objc TrainingSessionViewController.tableView(_:cellForRowAt:) + 140 (<compiler-generated>:0)
51 UIKitCore 0x00000001a2ae8120 -[_UIFilteredDataSource tableView:cellForRowAtIndexPath:] + 104 (_UIFilteredDataSource.m:87)
52 UIKitCore 0x00000001a2ab3168 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 644 (UITableView.m:15012)
53 UIKitCore 0x00000001a2a7ef00 -[UITableView _updateVisibleCellsNow:] + 2476 (UITableView.m:2953)
54 UIKitCore 0x00000001a2a9d310 -[UITableView layoutSubviews] + 368 (UITableView.m:9632)
55 UIKitCore 0x00000001a2dd1f84 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2504 (UIView.m:17526)
56 QuartzCore 0x00000001a32ec7b4 -[CALayer layoutSublayers] + 308 (CALayer.mm:10147)
57 QuartzCore 0x00000001a32ecc88 CA::Layer::layout_if_needed(CA::Transaction*) + 524 (CALayer.mm:10014)
58 QuartzCore 0x00000001a330147c CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 144 (CALayer.mm:2485)
59 QuartzCore 0x00000001a3246a6c CA::Context::commit_transaction(CA::Transaction*, double, double*) + 416 (CAContextInternal.mm:2449)
60 QuartzCore 0x00000001a3271f34 CA::Transaction::commit() + 732 (CATransactionInternal.mm:449)
61 QuartzCore 0x00000001a32732c4 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 96 (CATransactionInternal.mm:932)
62 CoreFoundation 0x000000019fe4c358 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36 (CFRunLoop.c:1799)
63 CoreFoundation 0x000000019fe465c4 __CFRunLoopDoObservers + 576 (CFRunLoop.c:1912)
64 CoreFoundation 0x000000019fe46b74 __CFRunLoopRun + 1056 (CFRunLoop.c:2953)
65 CoreFoundation 0x000000019fe4621c CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242)
66 GraphicsServices 0x00000001b794a784 GSEventRunModal + 164 (GSEvent.c:2259)
67 UIKitCore 0x00000001a2884fe0 -[UIApplication _run] + 1072 (UIApplication.m:3253)
68 UIKitCore 0x00000001a288a854 UIApplicationMain + 168 (UIApplication.m:4707)
69 Progression 0x000000010498ae50 main + 68 (AppDelegate.swift:14)
70 libdyld.dylib 0x000000019fb066b0 start + 4
Thread 1:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 2 name:
Thread 2:
0 libsystem_kernel.dylib 0x00000001cdc242d0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001cdc23660 mach_msg + 76 (mach_msg.c:103)
2 CoreFoundation 0x000000019fe4cc30 __CFRunLoopServiceMachPort + 380 (CFRunLoop.c:2641)
3 CoreFoundation 0x000000019fe46c14 __CFRunLoopRun + 1216 (CFRunLoop.c:2974)
4 CoreFoundation 0x000000019fe4621c CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242)
5 Foundation 0x00000001a10f5df0 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 232 (NSRunLoop.m:374)
6 Foundation 0x00000001a10f5cbc -[NSRunLoop(NSRunLoop) runUntilDate:] + 92 (NSRunLoop.m:421)
7 UIKitCore 0x00000001a2938d48 -[UIEventFetcher threadMain] + 516 (UIEventFetcher.m:838)
8 Foundation 0x00000001a1267a34 __NSThread__start__ + 864 (NSThread.m:724)
9 libsystem_pthread.dylib 0x00000001eb6a1b40 _pthread_start + 320 (pthread.c:881)
10 libsystem_pthread.dylib 0x00000001eb6aa768 thread_start + 8
Thread 3 name:
Thread 3:
0 libsystem_kernel.dylib 0x00000001cdc4a230 kevent + 8
1 Progression 0x0000000104b11c14 0x104984000 + 1629204
2 Progression 0x0000000104b125e8 0x104984000 + 1631720
3 libsystem_pthread.dylib 0x00000001eb6a1b40 _pthread_start + 320 (pthread.c:881)
4 libsystem_pthread.dylib 0x00000001eb6aa768 thread_start + 8
Thread 4 name:
Thread 4:
0 libsystem_kernel.dylib 0x00000001cdc242d0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001cdc23660 mach_msg + 76 (mach_msg.c:103)
2 CoreFoundation 0x000000019fe4cc30 __CFRunLoopServiceMachPort + 380 (CFRunLoop.c:2641)
3 CoreFoundation 0x000000019fe46c14 __CFRunLoopRun + 1216 (CFRunLoop.c:2974)
4 CoreFoundation 0x000000019fe4621c CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242)
5 AudioSession 0x00000001a79000c4 GenericRunLoopThread::Entry(void*) + 164 (GenericRunLoopThread.h:91)
6 AudioSession 0x00000001a790225c CAPThread::Entry(CAPThread*) + 92 (CAPThread.cpp:321)
7 libsystem_pthread.dylib 0x00000001eb6a1b40 _pthread_start + 320 (pthread.c:881)
8 libsystem_pthread.dylib 0x00000001eb6aa768 thread_start + 8
Thread 5:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 6:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 7:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 8:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 9:
0 libsystem_pthread.dylib 0x00000001eb6aa754 start_wqthread + 0
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x00000002824cb110 x1: 0x00000000009b4604 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000283ee4c48 x5: 0x0000000000000010 x6: 0x0000000000000049 x7: 0x000000020298de50
x8: 0x000000010787f320 x9: 0x0000000000000000 x10: 0x0000000000000005 x11: 0x0000000074200000
x12: 0x0000000000000038 x13: 0x0000000000000001 x14: 0x0000000000000036 x15: 0x0000000000000010
x16: 0x00000001afc27fe0 x17: 0x00000001ffad5380 x18: 0x000000011b53e89c x19: 0x00000002824cb1e0
x20: 0x00000002824cb100 x21: 0x00000002824cb1e0 x22: 0x0000000110032400 x23: 0x000000016b476040
x24: 0x0000000283ee4c48 x25: 0x000000016b4769e0 x26: 0x000000016b4768f0 x27: 0x000000020298e150
x28: 0x00000001051c10d0 fp: 0x000000016b475e70 lr: 0x0000000104c5eab0
sp: 0x000000016b475e70 pc: 0x0000000104bf0a30 cpsr: 0x60000000
esr: 0x92000006 (Data Abort) byte read Translation fault
我收到了关于这次崩溃的不同报告，有些报告显示了不同的摘要。我列出了其中的一些，堆栈跟踪总是导致我的更新功能。
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000009cc6ab0e28 -> 0x0000001cc6ab0e28 (possible pointer authentication failure)
VM Region Info: 0x1cc6ab0e28 is in 0x1000000000-0x7000000000; bytes after start: 54872706600 bytes before end: 357444153815
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
commpage (reserved) fc0000000-1000000000 [ 1.0G] ---/--- SM=NUL ...(unallocated)
---> GPU Carveout (reserved) 1000000000-7000000000 [384.0G] ---/--- SM=NUL ...(unallocated)
UNUSED SPACE AT END
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [13261]
Triggered by Thread: 0
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000c02836f4068 -> 0x00000002836f4068 (possible pointer authentication failure)
VM Region Info: 0x2836f4068 is in 0x280000000-0x2a0000000; bytes after start: 57622632 bytes before end: 479248279
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
unused shlib __TEXT 1fe08a000-1fe93c000 [ 8904K] r--/r-- SM=COW ... this process
GAP OF 0x816c4000 BYTES
---> MALLOC_NANO 280000000-2a0000000 [512.0M] rw-/rwx SM=PRV
GAP OF 0xd20000000 BYTES
commpage (reserved) fc0000000-1000000000 [ 1.0G] ---/--- SM=NUL ...(unallocated)
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [63749]
Triggered by Thread: 0
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Triggered by Thread: 0
用户可以通过按下按钮或结束编辑文本字段来触发此更新功能。我目前无法重现此崩溃。
我使用realm作为数据库，我将realm更新到最新版本，并使用了不同的版本。
有谁知道导致崩溃的原因吗？
在编辑我最初的问题以添加 Jay 提议的更多上下文时，我认为它找到了问题。
可能会发生什么？ 崩溃所在的视图包含 table 视图。每个单元格将在呈现之前进行配置。如果这个单元格（它是一个力量锻炼应用程序）的重量已经初始设置或正在更改，我会使用一个保存信息的标志。调用 prepareForReuse 时，此标志尚未重置。这现在意味着滚动 table 视图会为每个重复使用的单元触发数据库写入，这会导致对数据库进行不必要的写入。不需要，因为完全相同的数字已经保存在数据库中。
我的猜测：快速滚动可能会导致竞争条件（我已经阅读了一些关于领域的问题）并且这可能会导致这种奇怪的崩溃，因为有多个短时间内启动单次写入。
解决方法： 我现在将 prepareForReuse 上的标志重置为其初始值以防止这种不当行为。
只有在设置单元格并发生所描述的行为时才会发生崩溃。因此，我非常有信心最终解决了这个问题。让我们来看看。 -- 我无法重现该问题，但这种情况也很少见。